Marti Gregorio, Vicenç
Total activity: 89
Professional category
Tenure-track 2 lecturers
Doctoral courses
Doctor Enginyer Industrial
University degree
Enginyer Industrial Esp. Química
Enginyer Tècnic Industrial Esp. Química
Research group
SETRI - Group of Separation Techniques and Industrial Waste Treatment
Department
Department of Chemical Engineering
School
Barcelona School of Industrial Engineering (ETSEIB)
Associated research bodies
CTM. CTM Centre Tecnològic Open in new window
E-mail
vicens.martiupc.edu
Contact details
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Scientific and technological production
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1 to 50 of 89 results
  • Life cycle and human health risk assessments as tools for decision making in the design and implementation of nanofiltration in drinking water treatment plants

     Ribera, G; Clarens Blanco, Frederic; Martínez Lladó, Xavier; Jubany, Irene; Marti Gregorio, Vicenç; Rovira Boixaderas, Miquel
    Science of the total environment
    Date of publication: 2014-01-01
    Journal article

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    A combined methodology using life cycle assessment (LCA) and human health risk assessment (HHR) is proposed in order to select the percentage of water in drinking water treatment plants (DWTP) that should be nanofiltered (NF). The methodological approach presented here takes into account environmental and social benefit criteria evaluating the implementation of new processes into conventional ones. The inclusion of NF process improves drinking water quality, reduces HHR but, in turn, increases environmental impacts as a result of energy and material demand. Results from this study lead to balance the increase of the impact in various environmental categories with the reduction in human health risk as a consequence of the respective drinking water production and consumption. From an environmental point of view, the inclusion of NF and recommended pre-treatments to produce 43% of the final drinking water means that the environmental impact is nearly doubled in comparison with conventional plant in impact categories severely related with electricity production, like climate change. On the other hand, the carcinogenic risk (HHR) associated to trihalomethane formation potential (THMFP) decreases with the increase in NF percentage use. Results show a reduction of one order of magnitude for the carcinogenic risk index when 100% of drinking water is produced by NE. (C) 2013 Elsevier B.V. All rights reserved.

  • Uranium speciation studies at alkaline pH and in the presence of hydrogen peroxide using time-resolved laser-induced fluorescence spectroscopy

     Martinez Torrents, Albert; Meca, Sandra; Baumann, Nils; Marti Gregorio, Vicenç; Gimenez Izquierdo, Francisco Javier; Pablo Ribas, Joan de; Casas Pons, Ignasi
    Polyhedron
    Date of publication: 2013-05
    Journal article

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    Time-resolved laser-induced fluorescence spectroscopy (TRLFS) was used to study the speciation of uranium(VI) at very alkaline pH (11-13), at room temperature and in the absence of CO2. In this case, at pH = 11, two different fluorescence lifetimes appeared, which were attributed to the species UO2(OH)(3)(-) and (UO2)(3)(OH)(7)(-). At pH = 13, no fluorescence was detected, indicating that the predominant species, UO2(OH)(4)(2-), is not fluorescent. At pH = 12, the lifetime obtained is attributed to the predominant species UO2(OH)(3). Because of the absence of fluorescence of the UO2(OH)(4)(2-) species at room temperature, measurements at 10 K were made, obtaining two different lifetimes in the pH range between 12 and 13.5, indicating the presence of two different species: UO2(OH)(3)(-) and UO2(OH)(4)(2-). The difference between the lifetimes allowed the calculation of the contribution of each species to the total fluorescence signal intensity. From the experiments carried out in the presence of hydrogen peroxide, it was observed that hydrogen peroxide produces a quenching effect to the fluorescence of the uranium species. At pH 12 the quenching is static, which points to the formation of a non-fluorescent complex between U(VI) and hydrogen peroxide. Using the Stern-Volmer equation for static quenching, the equilibrium formation constant of the first species, UO2O2(OH)(2)(2-), was calculated to be logK(0) = 28.7 +/- 0.4, which is similar to the one determined using UV-Visible spectrometry, 28.1 +/- 0.2 Meca et al. (2011) [42]. (C) 2013 Elsevier Ltd. All rights reserved.

    Time-resolved laser-induced fluorescence spectroscopy (TRLFS) was used to study the speciation of uranium(VI) at very alkaline pH (11–13), at room temperature and in the absence of CO2. In this case, at pH = 11, two different fluorescence lifetimes appeared, which were attributed to the species UO2(OH)3− and (UO2)3(OH)7−. At pH = 13, no fluorescence was detected, indicating that the predominant species, UO2(OH)42−, is not fluorescent. At pH = 12, the lifetime obtained is attributed to the predominant species UO2(OH)3−. Because of the absence of fluorescence of the UO2(OH)42− species at room temperature, measurements at 10 K were made, obtaining two different lifetimes in the pH range between 12 and 13.5, indicating the presence of two different species: UO2(OH)3− and UO2(OH)42−. The difference between the lifetimes allowed the calculation of the contribution of each species to the total fluorescence signal intensity. From the experiments carried out in the presence of hydrogen peroxide, it was observed that hydrogen peroxide produces a quenching effect to the fluorescence of the uranium species. At pH 12 the quenching is static, which points to the formation of a non-fluorescent complex between U(VI) and hydrogen peroxide. Using the Stern–Volmer equation for static quenching, the equilibrium formation constant of the first species, UO2O2(OH)22−, was calculated to be logK0 = 28.7 ± 0.4, which is similar to the one determined using UV–Visible spectrometry, 28.1 ± 0.2 Meca et al. (2011) [42].

  • Ecological screening indicators of stress and risk for the Llobregat river water

     Lopez Roldan, Ramon; Jubany, Irene; Marti Gregorio, Vicenç; Gonzalez, Susana; Cortina Pallas, Jose Luis
    Journal of hazardous materials
    Date of publication: 2013-12-15
    Journal article

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    The objective of this article is to develop and apply several simple and rough indicators for river aquatic ecosystems assessment in order to screen potential chemical stressors. Several indicators, based on toxicity (PNEC) and on legislation levels (EQS) have been developed. All these indicators are ratios that were calculated by using public and private data of concentrations of a large list of compounds during a period of five years, including metals and organic compounds in the lower part of the Llobregat river basin at the intake of the drinking water treatment plant. Additionally, new campaigns were executed for increasing the information available on the presence of compounds not routinely analyzed, such as some other pesticides and pharmaceuticals. In the case of inorganic pollutants, the indicators obtained in this river section showed significant risk especially for zinc, but also for copper, nickel and barium. For organic pollutants, the pesticides terbuthylazine, diazinon, 2-methyl-4-chlorophenoxyacetic (MCPA), and in a few cases, chlorpyrifos and lindane, also showed indexes above the threshold. Among the pharmaceuticals, the antibiotics clarithromycin and ciprofloxacin were the only ones with risk indicators adverse to ecosystems. The specific values of the indexes obtained rely on the quantity and quality of the data available, so their interpretation should take into account that some values can be high due to the use of too conservative toxicological information.

  • Uranium speciation in river sediments contaminated by phosphate ores

     Meca, S.; Gimenez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Marti Gregorio, Vicenç; Pablo Ribas, Joan de
    Environmental chemistry letters
    Date of publication: 2012-03
    Journal article

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    Large amounts of phosphate ores with high concentrations of uranium were dumped by a phosphate plant into the Flix water reservoir in the Ebre River, Catalonia, NE Spain. These phosphate wastes have been mixed over the years with effluents from other industries as well as with the sediments of the river, resulting in a complex mixture of solid wastes and sediments. No investigations on uranium speciation in such sediments were made because of the complexity of the sediments composition as well as the relatively low uranium content. However, these studies are necessary in order to predict the release of the uranium to the river waters. Here, we studied uranium speciation in sediments from two sampling points of the Flix water reservoir and at depths from 5 to 113 cm. We used room temperature time-resolved laser fluorescence spectroscopy and a three-step sequential extraction procedure described by the Standards, Measurements, and Testing Programme of the European Union. We found that uranium was mainly present in the sediment samples as meta-autunite [Ca(UO2)2(PO4)2 10–12H2O], whose low solubility will result in a low release of uranium to the river waters. In addition, we found that some uranium was linked to sediments by forming surface complexes. We therefore made the first study of uranium speciation in the sediments of the Flix water reservoir.

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    Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH  Open access

     Meca, S.; Martinez Torrents, Albert; Marti Gregorio, Vicenç; Gimenez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Pablo Ribas, Joan de
    Dalton transactions
    Date of publication: 2011
    Journal article

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    The formation of uranyl-peroxide complexes was studied at alkaline media by using UV-Visible spectrophotometry and the STAR code. Two different complexes were found at a H2O2/U(VI) ratio lower than 2. A graphical method was used in order to obtain the formation constants of such complexes and the STAR program was used to refine the formation constants values because of its capacity to treat multiwavelength absorbance data and refining equilibrium constants. The values obtained for the two complexes identified [...] At hydrogen peroxide concentrations higher than 10-5 mol dm-3, and in the absence of carbonate, the UO2(O2)2(OH)2 4- complex is predominant in solution, indicating the significant peroxide affinity of peroxide ions for uranium and the strong complexes of uranium(VI) with peroxide.

  • Sorption and mobility of Sb(V) in calcareous soils of Catalonia (NE Spain): Batch and column experiments

     Martínez Lladó, Xavier; Valderrama Angel, Cesar Alberto; Rovira Boixaderas, Miguel Arcangel; Marti Gregorio, Vicenç; Gimenez Izquierdo, Francisco Javier; Pablo Ribas, Joan de
    Geoderma
    Date of publication: 2011-01-15
    Journal article

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    The sorption of Sb(V) onto natural calcareous soils was studied in batch and column experiments as a function of physicochemical properties of the soil, namely: organic matter, the active fraction of Fe and Al and the pH of the soils. Batch experiments were performed in order to determine the sorption capacity and the kinetic rate of the sorption. Freundlich isotherm described properly the equilibrium experimental data and the kinetic results show that the sorption was very slow in all the soils studied (equilibrium after 7 days) when compared with literature data for Sb(V) sorption onto soils with higher iron content. Column experiments were carried out in order to determine the mobility of Sb(V) in the soils. The Thomas model can describe partially the breakthrough curves obtained for the Sb(V) sorption on the soils. The fitting of the model to the experimental data would indicate that transport and kinetic parameters also affected the dynamic sorption behavior. The experimental breakthrough curves can be properly described by the convective–dispersive equation (CDE) by using the CXTFIT code, and the parameters obtained by the model were in concordance to the sorption capacity reported in the column experiments. This study indicates that sorption of Sb(V) onto the soils is mainly affected in batch experiments by their ‘active’ Fe and Al content; while in column experiments organic matter content appeared as an important parameter. Desorption experiments resulted in a metalloid recovery above 90%, which indicates a fast and effective method to recover Sb(V) from calcareous soils and has implications for its geochemical behavior (vertical mobility in soil profiles) as a result of its relatively low Sb retention.

  • Statistical testing based methodology for the analysis of soil pollution evidence

     Marti Gregorio, Vicenç; Pablo Ribas, Joan de; Gibert Agullo, Oriol; Gimenez Izquierdo, Francisco Javier; Martínez Lladó, Xavier; De Fays, Isolda
    International UFZ-Deltares/TNO Conference, on Management of Soil, Groundwater and Sediments
    Presentation's date: 2010-09-22
    Presentation of work at congresses

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  • Natural attenuation potential of a groundwater-fed Danish Wetland Impacted by diffuse nitrate contamination

     Bosch, Carme; Calderer, M.; Jubany, Irene; Marti Gregorio, Vicenç; Gibert Agullo, Oriol; Springael, Dirk; Aamand, Jens
    International UFZ-Deltares/TNO Conference, on Management of Soil, Groundwater and Sediments
    Presentation's date: 2010-09-22
    Presentation of work at congresses

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  • Enumeration of hydrocarbon-degrading bacteria by most probable number using resazurin as indicator

     Jubany, Irene; Calderer, M.; González, Cristina; Corcho, Diego; Muelle, Alfredo; Marti Gregorio, Vicenç
    International UFZ-Deltares/TNO Conference, on Management of Soil, Groundwater and Sediments
    Presentation's date: 2010-09-22
    Presentation of work at congresses

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  • Assessment of heterotrophic and autotrophic denitrification in aquifers by using batch tests

     Calderer, M.; Marti Gregorio, Vicenç; Pablo Ribas, Joan de; Rovira Boixaderas, Miguel Arcangel; Gibert Agullo, Oriol; Gimenez Izquierdo, Francisco Javier
    International UFZ-Deltares/TNO Conference, on Management of Soil, Groundwater and Sediments
    Presentation's date: 2010-09-22
    Presentation of work at congresses

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  • Generic values for groundwater restoration in aquifers contaminated by point sources

     Orejudo, Emili; Espínola, M. R.; Rovira, María; Marti Gregorio, Vicenç; Pablo Ribas, Joan de; Rovira Boixaderas, Miguel Arcangel
    International UFZ-Deltares/TNO Conference, on Management of Soil, Groundwater and Sediments
    Presentation's date: 2010-09-22
    Presentation of work at congresses

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  • Modelling enhanced groundwater denitrification in batch micrococosm tests

     Calderer, M.; Jubany, Irene; Pérez Magrané, Ramon; Marti Gregorio, Vicenç; Pablo Ribas, Joan de
    Chemical engineering journal
    Date of publication: 2010
    Journal article

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  • Study of Denitrification and Reductive Dechlorination Processes Applied to Groundwater Bioremediation  Open access

     Calderer Perich, Montserrat
    Defense's date: 2010-06-23
    Department of Chemical Engineering, Universitat Politècnica de Catalunya
    Theses

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    La present tesi es basa en l'estudi dels processos de bioremediació com a tecnologies de descontaminació d'aqüífers.Concretament, es pretén estudiar la desnitrificació i la decloració reductiva com a tecnologies de bioremediació per eliminar, respectivament, els nitrats i els hidrocarburs alifàtics clorats (o CAHs, de chlorinated aliphatic hydrocarbons) de les aigües subterrànies contaminades. A més, es pretén aplicar tecnologies avançades que permetin millorar en el coneixement d'aquests processos.L'aqüífer associat a la riera d'Argentona, situat a Argentona (Espanya), ha estat la zona d'estudi per tal d'investigar el procés de desnitrificació. En primer lloc, s'han dut a terme experiments en batch amb aigua subterrània i sòl subsuperficial del mencionat aqüífer. A partir d'aquests primers estudis, s'ha observat la baixa capacitat de l'aqüífer per eliminar els nitrats de manera natural, però alhora s'ha vist la viabilitat d'aplicar un procés de bioremediació com és l'addició de matèria orgànica. Paral·lelament, s'ha estudiat la influència de diferents factors com ara la presència d'oxigen i la tipologia de donador d'electrons sobre el procés de desnitrificació.Posteriorment, s'ha desenvolupat un model matemàtic per descriure el consum d'oxigen, de nitrats i de matèria orgànica per part de la població microbiana facultativa i heterotròfica present en el material d'aqüífer. Alguns paràmetres del model han estat calibrats i s'ha estudiat la qualitat d'aquests paràmetres. El model desenvolupat constitueix una primera aproximació per tal d'obtenir un model de desnitrificació in situ.Per tal d'avançar en l'estudi del procés de desnitrificació en condicions naturals, s'han realitzat experiments en dinàmic simulant el flux d'aigua subterrània a través de l'aqüífer. L'eficiència d'injectar matèria orgànica en aquestes condicions s'ha demostrat.Paral·lelament, s'han estudiat els efectes hidrodinàmics de l'aplicació de la bioremediació i, els resultats han demostrat la importància de dissenyar acuradament les tecnologies de bioremediació a escala de camp. Per altra banda, s'ha descrit la desnitrificació en condicions dinàmiques integrant en un model matemàtic les reaccions bioquímiques i els processos de transport que tenen lloc a la columna experimental.Finalment, s'han aplicat les noves tecnologies de biologia molecular per entendre els efectes de l'aplicació d'un procés de bioremediació a nivell microbià. Per una banda, l'aplicació de la tècnica de la reacció en cadena de la polimerasa a temps real (o real-time PCR, de real-time polymerase chain reaction) ha demostrat el creixement de la població microbiana i, concretament, de la població desnitrificant en el material d'aqüífer estimulat. Per altra banda, l'electroforesi en gel de gradient desnaturalitzant (o DGGE, de denaturing gradient gel electrophoresis) ha permès investigar els canvis en la població microbiana indígena del material d'aqüífer a causa de l'estimulació amb matèria orgànica.Amb l'objectiu d'avançar en el coneixement dels processos de bioremediació en aigües subterrànies, s'ha estudiat també la decloració reductiva de CAHs. En aquest cas, s'han aplicat metodologies experimentals destinades a l'estudi de la posible aplicació d'una barrera reactiva permeable per eliminar una ploma que conté majoritàriament cis-1,2-dicloroetilè i clorur de vinil, i que flueix cap al riu Zenne, prop de la ciutat de Brussel·les (Bèlgica).L'estudi ha inclòs experiments en batch per tal d'investigar el potencial degradatiu del material d'aqüífer i dels propis sediments del riu Zenne. Així mateix, també s'han dut a terme experiments en columna que simulaven el flux d'aigua subterrània a través dels sediments del riu o del material d'aqüífer. Els resultats han demostrat el gran potencial degradatiu dels sediments, que a la llarga es podrien potenciar com a biobarrera natural del sistema per tal de prevenir que les aigües contaminades arribin a l'aigua superficial del riu Zenne.

    This thesis is based on the study of bioremediation processes as reliable technologies to remove contaminants from groundwater.Specifically, it is aimed to study denitrification and reductive dechlorination as bioremediation technologies to remove nitrates and chlorinated aliphatic hydrocarbons (CAHs), respectively, from polluted groundwater. In addition, it is aimed to apply advanced technologies which allow improving on the knowledge of these processes.The aquifer associated to the Stream Argentona, located in Argentona, Catalunya (Spain), was selected as study site to investigate the denitrification process. In the first part, microcosm experiments containing groundwater and subsoil from the aquifer were performed. From these first studies it was observed the low capacity of the aquifer to eliminate nitrates under natural conditions, but, at the same time, it was noted the feasibility of applying a bioremediation process such as the addition of organic matter. In addition, the influence of different factors such as the presence of oxygen and the type of electron donor on the denitrification process was studied.Afterwards, a mathematical model was developed to explain the microbiological processes that occur when stimulating the aquifer material with an organic carbon source. The model could successfully explain the consumption of oxygen, nitrates and organic matter by the indigenous facultative heterotrophic microbial population from aquifer. Some parameters of the model were calibrated from experimental data and the quality of these parameters was investigated. The developed model constitutes a first approach in order to have reliable models for in situ denitrification.In order to advance in the study of the denitrification process in natural conditions, dynamic experiments were carried out simulating the groundwater flow through the aquifer. The efficiency of injecting organic matter under these conditions was demonstrated. At the same time, hydrodynamic effects of the process were observed, indicating the importance to design properly bioremediation technologies before its application in field-scale. Furthermore, an integrated model coupling the biochemical reactions and the transport processes inside the column was developed and applied to describe denitrification under dynamic conditions.Finally, molecular microbiological techniques were applied to investigate microbial changes due to the application of enhanced denitrification. On the one hand, real-time polymerase chain reaction (real-time PCR) assays revealed the growth of microbial population, specially of denitrifying bacteria in aquifer material stimulated with an organic carbon source. On the other hand, the denaturing gradient gel electrophoresis (DGGE) method allowed to investigate changes in the indigenous microbial community due to the amendment with organic matter.In order to advance in the knowledge of bioremediation processes in groundwater, reductive dechlorination of CAHs in groundwater was studied. In this case, experiments at laboratory scale were applied, aimed to study the possible application of a permeable reactive barrier (PRB) to eliminate a CAH-contaminated plume, containing basically cis-1,2-dichloroethene and vinyl chloride, which flows to the River Zenne near Brussels, Belgium.The study included batch experiments in order to investigate the degradation potential in aquifer and sediments of the River Zenne, as well as column experiments which simulated the groundwater flow through the sediments of the river or the aquifer material. The results demonstrated the high degradation potential of the sediments, which in the long term could be enhanced to act as a natural biobarrier of the system in order to prevent groundwater contaminants from arriving at the surface water of the River Zenne.

  • Denitrification in presence of acetate and glucose for bioremediation of nitrate-contaminated groundwater

     Calderer, M.; Gibert Agullo, Oriol; Marti Gregorio, Vicenç; Rovira Boixaderas, Miguel Arcangel; Pablo Ribas, Joan de; Jordana, S.; Guimera, J; Bruno Salgot, Jorge
    Environmental technology
    Date of publication: 2010
    Journal article

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  • Thorium sorption onto magnetite and ferrihydrite in acidic conditions

     Rojo, I; Seco, F; Rovira Boixaderas, Miguel Arcangel; Giménez, J; Cervantes Torre-Marín, Gemma; Marti Gregorio, Vicenç; Pablo Ribas, Joan de
    Journal of nuclear materials
    Date of publication: 2009-03
    Journal article

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  • Sorption of Th(IV) onto Iron Corrosion Products: EXAFS Study

     Seco, F; Hennig, C; Pablo Ribas, Joan de; Rovira Boixaderas, Miguel Arcangel; Rojo, I; Marti Gregorio, Vicenç; Gimenez, J; Duro, L; Grive, M; BRUNO, J
    Environmental science and technology
    Date of publication: 2009-04
    Journal article

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  • Processos que afecten la mobilitat de l'urani en entorns hiperalcalins oxidants i sediments contaminats.

     Meca Fabrega, Alejandra
    Defense's date: 2009-05-12
    Department of Chemical Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Changes of heavy metal and PCB contents in surficial sediments of the Barcelona harbour after the opening of a new entrance

     Gibert Agullo, Oriol; Marti Gregorio, Vicenç; Diez Berart, Sergio; Romo, Javier; Bayona ., Josep Maria; Pablo Ribas, Joan de; Martínez Lladó, Xavier
    Water, air and soil pollution
    Date of publication: 2009-11
    Journal article

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    The Barcelona harbour is one of the biggest and most important in commercial and passenger traffic in the Mediterranean Sea. In 2003, construction works for the enlargement of the port were carried out with the opening of a new entrance for large boats in the northern area. Following the opening of this new mouth, the redistribution of heavy metals (Hg, Cd, Pb, Cu, Zn, Ni and Cr), As and polychlorinated biphenyls (PCBs) was investigated to discuss their origin and to evaluate the environmental implications. A previous study of the sediments provided a first picture of high levels of heavy metals and PCBs in the innermost harbour (Port Vell). Then, the opening of the northern mouth led to a remarkable decline in the contaminant concentrations and to an improvement of the sediment quality. During the period 2002–2005, the percentage of concentration decreases in Port Vell for Hg, Pb and PCB (from 20% to 34%), for Zn and Cd (from 10% to 15%) and for the remaining metals with values lesser than 10%. This general decline was probably due to a more efficient water flushing between the original and the new northern entrance. Concentrations of target contaminants were also compared against sediment quality guidelines to assess the ecotoxicological significance of sedimentary contaminants on the benthic communities.

  • Thorium sorption onto magnetite and ferrihydrate in acidic conditions

     Rojo, I.; Seco, F.; Rovira, M.; Gimenez Izquierdo, Francisco Javier; Cervantes, G.; Marti Gregorio, Vicenç; Pablo Ribas, Joan de
    Journal of nuclear materials
    Date of publication: 2009-01-01
    Journal article

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    Sorption of Th(IV) onto two-line ferrihydrite and magnetite in NaClO4 solutions has been studied as a function of pH and ionic strength revealing that sorption onto both solids increases with pH while it is independent on ionic strength. Sorption capacity of both solids is high, the maximum sorption (almost 100% of Th(IV)) occurs at pH higher than 3.5 for ferrihydrite, and higher than 3.0 for magnetite. Sorption variation with pH was modeled with three different models using the FITEQL 4.0 code: non-electrostatic model, constant capacitance model, and diffuse-double layer model. In all cases, good fit to the experimental data is obtained with one-species: a corner-sharing bidentate-mononuclear surface complex, (triple bond; length of mdashFeO)2Th2+, which coincides with the surface complex postulated on these solids surface in previous spectroscopic studies; however, the monodentate species triple bond; length of mdashFeOThOH2+ also gives a satisfactory fit. Under the experimental conditions of the present study, any effect of possible thorium colloid formation is negligible.

  • Antimony(V) sorption and mobility in calcareous soils

     Marti Gregorio, Vicenç; Rovira Boixaderas, Miguel Arcangel; Martinez-Lladó, X; Gimenez Izquierdo, Francisco Javier; Pablo Ribas, Joan de
    Geochimica et cosmochimica acta
    Date of publication: 2008-07
    Journal article

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  • UO2 dissolution in the presence of hydrogen peroxide at pH>11

     Meca, S; Marti Gregorio, Vicenç; Pablo Ribas, Joan de; Gimenez Izquierdo, Francisco Javier; Casas Pons, Ignasi
    Radiochimica acta
    Date of publication: 2008-09
    Journal article

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  • Sorption of selenium(IV) and selenium(VI) onto natural iron oxides: Goethite and hematite

     Rovira Boixaderas, Miguel Arcangel; Gimenez Izquierdo, Francisco Javier; Martínez Martínez, María R.; Marti Gregorio, Vicenç; Pablo Ribas, Joan de; Martinez-Llado, X; Duro, L
    Journal of hazardous materials
    Date of publication: 2008-01
    Journal article

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    Selenium is a toxic element with a relatively high mobility in the natural waters. Iron oxy-hydroxides might play an important role in the migration of this element as well as on its removal from contaminated water. In this work we study the interaction of Se(IV), and Se(VI) with natural iron oxides hematite and goethite through two series of batch experiments at room temperature. In the first series, sorption as a function of initial selenium concentration is studied and the results have been fitted with Langmuir isotherms. In a second series of experiments, sorption is studied as a function of pH, being the main trend an increase of the sorption at acidic pH. The variation of the sorption with pH has been modelled with a triple layer surface complexation model and using the FITEQL program. The experimental data have been modelled considering for the Se(IV) the formation of the FeOSe(O)O− complex onto the hematite surface, and a mixture of FeOSe(O)O−, and FeOSe(O)OH onto the goethite surface. For Se(VI) the surface complex considered is FeOH2 +–SeO4 2− on both goethite and hematite.

  • Sorption of antimony (V) onto synthetic goethite in carbonate medium

     Martinez-Llado, X; Martínez Lladó, Xavier; Pablo Ribas, Joan de; Gimenez Izquierdo, Francisco Javier; Ayora Ibáñez, Carlos; Marti Gregorio, Vicenç; Rovira Boixaderas, Miguel Arcangel
    Solvent extraction and ion exchange
    Date of publication: 2008-06
    Journal article

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    The sorption kinetics of antimony(V) on synthetic goethite is very fast compared to the sorption of other metals on goethite (e.g. arsenic and selenium) and depends on temperature, with an activation energy of 49+9 kJ . mol21 in the temperature range 15–358C. Sorption isotherms have been developed at different temperatures and ionic strength values. The results have been modelled using a Langmuir isotherm and there is not a considerable influence of neither the temperature in the range studied (158C–358C), nor the ionic strength (between 0.001 and 0.01 mol . dm23). Sorption is very high at pH values lower than 8, at more alkaline pH, the sorption decreases with pH, as expected considering the Antimony(V) predominating complex in solution, Sb(OH)6 2. Triple-layer model successfully describes the data obtained by assuming a bidentate edge-sharing surface complex of antimonate on the surface of goethite.

  • Characterization of azo dye (Acid Red 14) removal with granular activated carbon: Equilibrium and kinetic data

     Valderrama Angel, Cesar Alberto; Cortina Pallas, Jose Luis; Farran Marsa, Adriana; Marti Gregorio, Vicenç; Gamisans Noguera, Javier; de las Heras Cisa, F. Xavier
    Solvent extraction and ion exchange
    Date of publication: 2008-06
    Journal article

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  • Trace Element distribution in topsoils of Catalonia: Background and Reference Values and Relationship with Regional Geology

     Marti Gregorio, Vicenç; Vilà, M; Martínez-Lladó, X; Rovira Boixaderas, Miguel Arcangel; Domènech, J A; Pablo Ribas, Joan de
    Environmental engineering science
    Date of publication: 2008-07
    Journal article

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  • Presència, mobilitat i risc d'elements traça en sòls naturals. Els mecanismes de sorció com a reguladors de l'equilibri sòl-aigua.  Open access

     Martínez Lladó, Xavier
    Defense's date: 2008-06-12
    Department of Mining Engineering and Natural Resources, Universitat Politècnica de Catalunya
    Theses

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    La correcta gestió del sòl és fonamental per a la protecció d'aquest vector ambiental que serveix de suport a bona part de les activitats de la societat actual i constitueix un actor important en els cicles biogeoquímics globals. La contaminació per elements traça i els riscs per a la salut humana i els ecosistemes, derivats de la presència d'aquests en el sòl, és un problema ambiental de consideració important. En aquest aspecte, nombroses agències i administracions, ja han començat a implementar polítiques de protecció basades en els anomenats Criteris de Qualitat del Sòl (CQS), els quals estableixen uns valors llindar que defineixen els límits de concentració en el sòl per a la presa de decisions. Degut als diferents processos de descomposició de la roca mare, els elements traça es troben de forma natural en el sòl. L'enorme variabilitat d'aquest vector, juntament amb la influència de la geologia subjacent implica que, abans de l'establiment de CQS, és necessàri conèixer la concentració de fons d'elements traça en el sòls de cada regió.Les metodologies d'anàlisi de risc són una eina molt important per a l'establiment de CQS. A partir de la definició d'un escenari representatiu i mitjançant un model d'exposició de la població d'estudi, les eines d'anàlisi de risc son capaces de definir la dosi rebuda. Aquestes metodologies ténen en en compte les característiques toxicològiques i l'exposició de la població d'estudi a cada compost o element i estableixen els valors llindar per sota del qual el risc associat a la presència de contaminants en el sòl és assumible.No obstant això, aquests càlculs requereixen un coneixement exhaustiu de la toxicitat de les substàncies i la seva mobilitat entre els diferents compartiments ambientals. Els elements traça presents en el sòl poden ser transportats fins a les aigües subterrànies, un compartiment ambiental molt més sensible i al qual la població està molt més exposada. És per aquesta raó que és de vital importància conèixer els mecanismes que regulen la mobilitat de contaminants en el sistema sòl aigua i l'obtenció de models que prediguin aquesta mobilitat de forma correcta en les diferents condicions ambientals que poden tenir lloc a la natura.En una primera part, aquesta tesi s'ha centrat en el càlcul dels nivells de fons d'elements traça en sòls de Catalunya com a etapa prèvia a l'establiment de CQS. Mitjançant eines SIG, s'ha dissenyat una campanya de mostreig per obtenir mostres de sòls naturals representatives de la totalitat del territori. L'anàlisi per ICP-MS i el posterior tractament estadístic de les dades, han permès el càlcul dels valors de fons i referència per a 17 elements traça en sòls de Catalunya. També s'ha estudiat la relació amb la geologia subjacent, així com l'efecte de l'ús del sòl.Seguidament, s'ha estudiat la mobilitat d'antimoni en sòls carbonàtics naturals adoptant l'aproximació de composició generalitzada.A partir d'experiments batch i en columna s'ha estudiat la capacitat de retenció d'antimoni d'aquests sòls i s'han desenvolupat models empírics per a la predicció de la seva mobilitat.Aplicant l'aproximació d'additivitat de components, s'han estudiat els mecanismes que controlen la retenció d'antimoni i seleni en òxi-hidròxids de ferro. A partir d'experiments batch amb goetita i hematita naturals s'ha verificat l'aplicabilitat diferents mecanismes químics proposats a la literatura per a la complexació de selenit i selenat en aquestes dues fases minerals. En el cas de l'antimoni, s'ha estudiat l'efecte de la temperatura, la força iònica i el pH sobre la capacitat de sorció de la goetita sintètica i s'ha proposat un mecanisme de complexació superficial.En l'últim apartat s'apliquen les metodologies d'anàlisi de risc per calcular la concentració màxima d'elements traça admissible en el sòl. S'han definit escenaris d'exposició que han permès quantificar el risc associat a la presència d'elements traça en el sòl i s'ha calculat la concentració màxima admissible per a les diferents vies d'exposició.Finalment, a partir dels resultats obtinguts en els capítols anteriors, s'ha estudiat l'aplicabilitat de l'aproximació de l'additivitat de components i composició generalitzada per a la predicció de la mobilitat de contaminants. Utilitzant codis de transport geoquímic, s'ha definit un model conceptual per estudiar els efectes sobre el càlcul del risc associat a la presència de contaminants en el sistema sòl-aigua.

    An adequate management of the soil system is essential in order to protect this media where current society develops most of its activities and which acts as a main actor in the global biogeochemical cycles. Trace element pollution and its associated risk for the human health and ecosystems is a concerning environmental problem. In this framework, numerous enviromental agencies and governments have already developed protection policies based in what is called Soil Quality Guidelines (SQG) and establishing treshold values which define concentration limits for decision taking.Trace elements are naturally occurring in soil due to parent material descomposition. The huge variability that soil shows, together with influence of the underlying geology, makes regional background values development a necessary step prior to SQG definition.Risk assessment methodologies configure a fundamental tool for the SQG establishment. Based in the definition of representative scenarios and using an exposure model, risk assessment tools are capable of calculating the received dose. These methodologies take into account toxicological characteristics a population exposure to each contaminant in order to calculate the treshold values below which the risk associated to the presence of trace elements in soils is acceptable.However, these calculations require and exhaustive knowledge of the subtances toxicity and mobility between each environmental compartment. Trace elements in soil can be transported to groundwater, a more vulnerable media to which population is more exposed. For this reason, it is crucial to understand the mechanisms involved in pollutants mobility in the soil-water system and the development of models capable of predict this mobility within the naturally occuring environmental conditions.In the first part, this thesis has focused in the definition of the background levels of trace elements in soils of Catalunya as a previous stage to the SQG establishment. Natural soil samples representative of the whole region have been obtained by means of sampling campaign designed with GIS tools. ICP-MS analysis and subsequent statistical treatment of the data allowed to calculate background and reference values for 17 trace elements in catalan soils. Relationship with underlying geology and soil use influence have also been investigated.Antimony mobility in natural carbonaceous soils has also been studied using the generalized composition approach. Batch and column experiments allowed to investigate the retention capacity of these soils and the development of empirical models for prediction purposes.Using the component additivity approach, retention mechanisms that control antimony and selenium in iron oxi-hydroxides have also been studied. Batch experiments with natural goethite and hematite provided evidences of the applicabilty of previously purposed mechanisms for selenite and selenate complexation to synthetic minerals to natural materials. The effect of temperature, ionic strenght and pH in the interaction between goethite and antimony has been studied. A surface complexation mechanism for this interaction has also been proposed. In the last chapter, risk analysis tools are used to compute the maximum acceptabletrace element concentration in soils for human health. Exposure scenarios have been defined in order to quantify the risk associated to the presence of trace elements in soils.Finally, the applicability of the component additivity and generalized composition approach for the prediction of pollutants mobility have been studied. Using geochemical transport codes, a conceptual model has been defined in order to study the influence in the risk assessment of pollutants in the soil-water system.

  • Influence of background element sources and the contiguity of scenarios on guideline values for Human Health protection

     Marti Gregorio, Vicenç; Pablo Ribas, Joan de; Calderer, M; Martínez-Lladó, X; Rovira Boixaderas, Miguel Arcangel; Domènech, J A; Realp, E; Marquez, E; Latres, S
    10th International UFZ-Deltares/TNO Conference on Soil-Water Systems in cooperation with Provincia di Milano
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  • Laboratory tests for the application of a byproduct from slaughterhouse manufacturing process to the washing of soils contaminated by petroleum hydrocarbon products

     Girbent, J; Marti Gregorio, Vicenç; Clarens Blanco, Frederic; Seco, F; González, C; Pablo Ribas, Joan de; Rovira Boixaderas, Miguel Arcangel; Marginet, M Rovira X; Roig, J
    10th International UFZ-Deltares/TNO Conference on Soil- Water Systems
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  • Ecological risk assessment of river basin due to contaminated sediments: preliminar results from the case of flix in Ebro river (Spain)

     Marti Gregorio, Vicenç; Jiménez, L; Pablo Ribas, Joan de
    10th International UFZ-Deltares/TNO Conference on Soil- Water Systems
    Presentation of work at congresses

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  • Study of alternative approaches to calculate guideline concentrations of elements in soil protective for ecosystem

     Marti Gregorio, Vicenç; Pablo Ribas, Joan de; Jiménez, L; Martínez-Lladó, X; Calderer, M; Rovira Boixaderas, Miguel Arcangel; Domènech, J A; Realp, E; Márquez, E; Latres, S; Tarazona, J V; Carbonell, G
    10th International UFZ-Deltares/TNO Conference on Soil- Water Systems
    Presentation of work at congresses

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  • Phase change on the surface of the monoliths of wastes treated by Stabilization/Solidification (S/S) techniques subjected to a semi-dynamic leaching test

     Buj Corral, Irene; Torras Grane, Josep; Marti Gregorio, Vicenç; Rovira Boixaderas, Miguel Arcangel; Pablo Ribas, Joan de
    10th International UFZ-Deltares/TNO Conference on Soil-Water Systems in cooperation with Provincia di Milano
    Presentation's date: 2008-09-24
    Presentation of work at congresses

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  • Developement of risk-based contaminant reference concentration based on protection of human health for the sustainable use of groundwater

     Orejudo, E; Mora, R; Carnicero, V; Marti Gregorio, Vicenç; López, D; Pablo Ribas, Joan de; Rovira Boixaderas, Miguel Arcangel
    10th International UFZ-Deltares/TNO Conference on Soil- Water Systems
    Presentation of work at congresses

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  • Simplified methodology for the sensitivity analysis of guideline values applied to water

     Orejudo, E; Mora, R; Carnicero, V; Marti Gregorio, Vicenç; López, D; Pablo Ribas, Joan de; Rovira Boixaderas, Miguel Arcangel
    10th International UFZ-Deltares/TNO Conference on Soil- Water Systems
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  • Study of groundwater in situ biodenitrification treatment by developing chemical indicators at laboratory scale

     Rovira, M; Marti Gregorio, Vicenç; Calderer, M; Pablo Ribas, Joan de; Cortina Pallas, Jose Luis
    10th International UFZ-Deltares/TNO Conference on Soil- Water Systems
    Presentation of work at congresses

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  • Evaluation of the measurement of petroleum hydrocarbon vapours in UST spills by using photoionization detector: sensitivity, selectivity and implications in risk measurement

     Marti Gregorio, Vicenç; Rovira Boixaderas, Miguel Arcangel; Pablo Ribas, Joan de; Cortina Pallas, Jose Luis; Portella, R
    10th International UFZ-Deltares/TNO Conference on Soil- Water Systems
    Presentation of work at congresses

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  • Development of an integrated methodology for the evaluation of the environmental risk derived from acid draining of mine tailings to groundwater

     Marti Gregorio, Vicenç; Rovira Boixaderas, Miguel Arcangel; Pablo Ribas, Joan de; Cortina Pallas, Jose Luis; Portella, R
    10th International UFZ-Deltares/TNO Conference on Soil- Water Systems
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  • A new time resolved laser-induced fluorescence spectrometry (TRFLS) data adquisitio procedure aplied to the uranyl-phosphate system

     Bonhoure, I; Meca, S; Marti Gregorio, Vicenç; Pablo Ribas, Joan de; Cortina Pallas, Jose Luis
    Radiochimica acta
    Date of publication: 2007-03
    Journal article

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  • Distribution of polycyclic aromatic hydrocarbons (PAHs) and tributyltin (TBT) in Barcelona harbour sediments and their impact on benthic communities

     Marti Gregorio, Vicenç; Gibert Agullo, Oriol; Martinez-Llado, X; Diez, S; Romo, J; Bayona, J M; Pablo Ribas, Joan de
    Environmental pollution
    Date of publication: 2007-07
    Journal article

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  • Uptake of U(VI) by hydrated and degraded cement

     Colas, E; Grive, M; Gaona, X; Duro, L; Rojo Cort, Isabel; Rovira Boixaderas, Miguel Arcangel; Marti Gregorio, Vicenç; Pablo Ribas, Joan de
    Geochimica et cosmochimica acta
    Date of publication: 2007-08
    Journal article

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  • Desarrollo y evaluación de métodos integrados para la gestión de suelos y aguas subterráneas contaminadas aplicando metodología de análisis de riesgo sobre salud humana.

     BAGATTINI PORTELLA, ROBERTO
    Defense's date: 2007-07-26
    Department of Chemical Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Development of chemical indicators to study in situ biodenitrification processes in contaminated groundwater

     Marti Gregorio, Vicenç; Calderer, M.; Rovira Boixaderas, Miguel Arcangel; Seco, F.; Pablo Ribas, Joan de; Cortina Pallas, Jose Luis; Jordana, S.; Duro, L.; Guimera Sola, Jordi; Bruno Salgot, Jorge
    International Conference on WAter POllution in Natural POrus Media and Different Scales. Assessment of Fate, Impact and Indicators WAPO2
    Presentation's date: 2007
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  • Kinetic studies of nitrate microbiological reduction for an in situ heterotrophic denitrification test of a polluted aquifer

     Guimera Sola, Jordi; Bruno Salgot, Jorge; Rovira Boixaderas, Miguel Arcangel; Marti Gregorio, Vicenç
    International Conference on WAter POllution in Natural POrus Media and Different Scales. Assessment of Fate, Impact and Indicators WAPO2
    Presentation of work at congresses

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  • Uptake of selenate on hydrated and degraded cement:batch and dynamic experiments

     Rojo, I; Rovira Boixaderas, Miguel Arcangel; Marti Gregorio, Vicenç; Pablo Ribas, Joan de; Duro, L; Gaona, X; Colàs, E; Grivé, M
    MOBILE FISSION AND ACTIVATION PRODUCTS IN NUCLEAR WASTE DISPOSAL
    Presentation of work at congresses

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  • Determination of cyanide and related compounds by Capillary Zone Electrophoresis

     Aguilar Sanjuan, Manuel; Farran Marsa, Adriana; Vicens, Martí; Marti Gregorio, Vicenç; Martínez Martínez, María R.
    Trends in chromatography
    Date of publication: 2006-12
    Journal article

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  • Assessing trace elements distribution in natutal top soils with geological maps: Catalonia case study

     Marti Gregorio, Vicenç; Rovira Boixaderas, Miguel Arcangel; Pablo Ribas, Joan de
    European Congress on Regional Geoscientific Cartography and Information Systems
    Presentation's date: 2006-06
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  • Gestión de emplazamientos contaminados con hidrocarburos del petróleo basada en la Atenuación Natural Monitorizada (ANM)

     Marti Gregorio, Vicenç; Pablo Ribas, Joan de; Rovira Boixaderas, Miguel Arcangel
    Retema (Madrid). Revista Técnica de Medio Ambiente
    Date of publication: 2005-06
    Journal article

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  • Determination of trace elements background and reference levels in top-soils of Catalonia

     Marti Gregorio, Vicenç; Rovira Boixaderas, Miguel Arcangel; Pablo Ribas, Joan de
    9th International FZK/TNO Conference on Soil-Water Systems (Consoil 2005)
    Presentation of work at congresses

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