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    GREDIQ-RIMA: The evolution of a teaching project of experimentation in chemistry  Open access

     Grau Vilalta, Maria Dolors; Guaus Guerrero, Ester; Martínez Martínez, María R.; Calvet Tarragona, Aurelio; Farran Marsa, Adriana; Salán Ballesteros, Mª Núria; Alvarez Del Castillo, M. Dolores; Gorchs Altarriba, Roser; Almajano Pablos, Maria Pilar; Morillo Cazorla, Margarita; Garrido Soriano, Nuria
    Procedia - Social and behavioral sciences
    Date of publication: 2012-09-01
    Journal article

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    Authors of this project belong to the Resources Chemistry Teaching Group (GReDiQ) involved in RIMA (Research and innovation in learning methodologies). The audiovisual and multimedia material productions realized have been grouped into three themes: Basic Techniques of Experimentation in Chemistry, Safety in Chemistry Laboratories and Advanced Techniques of Experimentation in Chemistry. This work has been awarded a prize of the Universitat Politècnica de Catalunya (UPC–BARCELONATECH), one of the Autonomous Region of Catalunya and another one of a State scope

    Postprint (author’s final draft)

  • Binary fixed bed modeling of phenol/aniline removal from aqueous solutions onto hyper-cross-linked resin (Macronet MN200)

     Valderrama Angel, Cesar Alberto; Poch Garcia, Jordi; Barios, Joan I.; Farran Marsa, Adriana; Cortina Pallas, Jose Luis
    Journal of chemical and engineering data
    Date of publication: 2012-05-10
    Journal article

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    The sorption performance of hyper-cross-linked Macronet resin (MN200) to remove phenol and aniline from aqueous solution has been evaluated. Fixed bed column experiments were undertaken to obtain the breakthrough curves in both single and binary solutions. The film-surface diffusivity model has been used to predict the single (phenol and aniline) fixed bed breakthrough curves by using the Langmuir and Freundlich single isotherm data to represent the equilibrium. A good description of the experimental data has been obtained by both isotherms, and the mass transfer coefficient and the surface diffusivity have been obtained as optimized parameters for both solutes. The binary breakthrough curve prediction has been performed by the film surface diffusion model, incorporating an equilibrium relationship defined by the extended Langmuir isotherm model and the ideal sorbed solution theory (IAST). The sum of square errors (SSE) obtained for the IAST approach confirms the good agreement between the experimental and the predicted breakthrough data and the deviation obtained for the extended Langmuir model. The surface diffusivities in binary sorption reported a significant difference to those obtained in a single system, indicating that binary sorption is mainly controlled by the intraparticle diffusion.

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    Material docente en formato digital para asignaturas de experimentación en química de la UPC  Open access

     Grau Vilalta, Maria Dolors; Guaus Guerrero, Ester; Martínez Martínez, María R.; Calvet Tarragona, Aurelio; Salán Ballesteros, Mª Núria; Farran Marsa, Adriana; Gorchs Altarriba, Roser; Alvarez Del Castillo, M. Dolores; Garrido Soriano, Nuria; Morillo Cazorla, Margarita; Almajano Pablos, Maria Pilar; Pardo Trafach, Patricia Teresa; Calafell Monfort, Margarita; Graells Sobre, Moises; Cardona Planes, Anna Maria
    Congrés Internacional de Docència Universitària i Innovació
    Presentation of work at congresses

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  • L'evolució d'un projecte de millora de la docència  Open access

     Grau Vilalta, Maria Dolors; Guaus Guerrero, Ester; Martínez Martínez, María R.; Calvet Tarragona, Aurelio; Salán Ballesteros, Mª Núria; Farran Marsa, Adriana; Gorchs Altarriba, Roser; Alvarez Del Castillo, M. Dolores; Garrido Soriano, Nuria; Morillo Cazorla, Margarita; Almajano Pablos, Maria Pilar; Cardona Planes, Anna Maria
    Jornada d'Innovació Docent UPC
    Presentation's date: 2011-02-02
    Presentation of work at congresses

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  • Evaluation of phenol/aniline (single and binary) removal from aqueous solutions onto hyper-cross-linked polymeric resin (Macronet MN200) and granular activated carbon in fixed-bed column

     Valderrama Angel, Cesar Alberto; Barios, Joan I.; Farran Marsa, Adriana; Cortina Pallas, Jose Luis
    Water, air and soil pollution
    Date of publication: 2011-02
    Journal article

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  • LA QUÍMICA i la societat

     Grau Vilalta, Maria Dolors; Font Soldevila, Jose; Sanz Balague, Joaquim; Guaus Guerrero, Ester; Calvet Tarragona, Aurelio; Salán Ballesteros, Mª Núria; Martínez Martínez, María R.; Farran Marsa, Adriana; Gorchs Altarriba, Roser; Alvarez Del Castillo, M. Dolores; Garrido Soriano, Nuria; Morillo Cazorla, Margarita; Almajano Pablos, Maria Pilar; Cardona Planes, Anna Maria; Macanás de Benito, Jorge; Bonsfills Pedros, Ana; Gamisans Noguera, Javier; Dorado Castaño, Antonio David; Lao Luque, Concepcion; Torrent Burgues, Juan; Molins Duran, Gemma; Colom Fajula, Xavier; Carrillo Navarrete, Fernando; Ramon Portés, Eva; Garriga Sole, Pere; Sole Sardans, M. Montserrat; Ardanuy Raso, Monica; Pares Sabates, Ferran; Roncero Vivero, Maria Blanca; Cusola Aumedes, Oriol
    Collaboration in exhibitions

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  • Como usar Atenea en la gestión de grupos en una asignatura de laboratorio de Químic

     Martínez Martínez, María R.; Florido Pérez, Antonio; Farran Marsa, Adriana
    Dia d'Atenea
    Presentation's date: 2010-06-04
    Presentation of work at congresses

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  • Materiales digitales para experimentación en química en abierto: UPCommons

     Grau Vilalta, Maria Dolors; Guaus Guerrero, Ester; Martínez Martínez, María R.; Calvet Tarragona, Aurelio; Farran Marsa, Adriana; Gorchs Altarriba, Roser; Salán Ballesteros, Mª Núria
    Congreso Universitario de Innovación Educativa en las Enseñanzas Técnicas
    Presentation's date: 2010-07-08
    Presentation of work at congresses

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  • Producciones digitales para la fase pre-laboratorio de experimentación en química

     Grau Vilalta, Maria Dolors; Calvet Tarragona, Aurelio; Farran Marsa, Adriana; Gorchs Altarriba, Roser; Guaus Guerrero, Ester; Martínez Martínez, María R.; Salán Ballesteros, Mª Núria
    Simposium Iberoamericano en Educación, Cibernética e Informática
    Presentation's date: 2010-06-29
    Presentation of work at congresses

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    Material docent en format digital per assignatures d'experimentació en química  Open access

     Grau Vilalta, Maria Dolors; Almajano Pablos, Maria Pilar; Álvarez, M. Dolors; Calafell Monfort, Margarita; Calvet Tarragona, Aurelio; Cardona Planes, Anna Maria; Farran Marsa, Adriana; Garrido Soriano, Nuria; Gorchs Altarriba, Roser; Graells Sobre, Moises; Guaus Guerrero, Ester; Martínez Martínez, María R.; Morillo Cazorla, Margarita; Pardo Trafach, Patricia Teresa; Salán Ballesteros, Mª Núria
    Jornada d'Innovació Docent UPC
    Presentation of work at congresses

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    En aquesta comunicació es presenta un projecte elaborat arran de l’interès mostrat per un grup de professorat en disposar de material audiovisual propi i comú per a assignatures experimentals de química de diferents titulacions impartides per diferents centres de la Universitat Politècnica de Catalunya (UPC). Els autors d’aquest treball pertanyen al Grup de Recursos per a la Didàctica de la Química (GReDiQ), integrat en el projecte RIMA (http://www.upc.edu/rima) de l’Institut de Ciències de l’Educació de la UPC. L’elaboració de material audiovisual digital constitueix un dels objectius principals plantejats pel GReDiQ i pretén generar tant un material de suport per a les activitats pre-laboratorio, com un element motivador i que faciliti l’aprenentatge de l’alumnat en les sessions de laboratori de les matèries de Química i Enginyeria química, que apareixen com assignatures de formació bàsica en gairebé tots els plans d’estudi dels nous Graus d’Enginyeria que s’ estan implantant a la UPC. La utilització del material audiovisual digital possibilita que l’alumnat prengui consciència de les activitats de laboratori, així com dels hàbits bàsics de manipulació i seguretat en el laboratori, del fonament d’operacions bàsiques o instrumentació a utilitzar.

  • Kinetic evaluation of phenol/aniline mixtures adsorption from aqueous solutions onto activated carbon and hypercrosslinked polymeric resin (MN200)

     Valderrama Angel, Cesar Alberto; Barios, Joan I.; Caetano, Michelle; Farran Marsa, Adriana; Cortina Pallas, Jose Luis
    Reactive and functional polymers
    Date of publication: 2010-03
    Journal article

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  • Distinció Jaume Vicens Vives

     Almajano Pablos, Maria Pilar; Alvarez Del Castillo, M. Dolores; Calvet Tarragona, Aurelio; Cardona Planes, Anna Maria; Farran Marsa, Adriana; Garrido Soriano, Nuria; Gorchs Altarriba, Roser; Grau Vilalta, Maria Dolors; Guaus Guerrero, Ester; Martínez Martínez, María R.; Morillo Cazorla, Margarita; Salán Ballesteros, Mª Núria
    Award or recognition

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  • Evaluating Binary Sorption of Phenol/Aniline fromAqueous Solutions onto Granular Activated Carbon and Hypercrosslinked Polymeric Resin (MN200)

     Valderrama Angel, Cesar Alberto; Barios, Joan I.; Farran Marsa, Adriana; Cortina Pallas, Jose Luis
    Water, air and soil pollution
    Date of publication: 2010-07
    Journal article

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  • Evaluation of polyaromatic hydrocarbon removal from aqueous solutions using activated carbon and hyper-crosslinked polymer (Macronet MN200)

     Valderrama Angel, Cesar Alberto; Gamisans Noguera, Javier; Cortina Pallas, Jose Luis; Farran Marsa, Adriana; de las Heras Cisa, F. Xavier
    Journal of chemical technology & biotechnology
    Date of publication: 2009-02
    Journal article

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  • Phenol removal from aqueous solution by adsorption and ion exchange mechanisms onto polymeric resins

     Caetano, M; Valderrama Angel, Cesar Alberto; Farran Marsa, Adriana; Cortina Pallas, Jose Luis
    Journal of colloid and interface science
    Date of publication: 2009-10
    Journal article

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  • INTEGRACIÓN DE PROCESOS DE EXTRACCION REACTIVA Y PROCESOS DE MEMBRANAS EN LA ELIMINACIÓN DE COMPUESTOS INDESADOS EN ETAPAS DE POTABI

     Farran Marsa, Adriana; Gibert Agullo, Oriol; Valderrama Angel, Cesar Alberto; Yaroshchuk, Andriy; Cortina Pallas, Jose Luis
    Participation in a competitive project

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  • Kinetic study of acid red "dye" removal by activated carbon and hyper-cross-linked polymeric sorbents Macronet Hypersol MN200 and MN300

     Valderrama Angel, Cesar Alberto; Cortina Pallas, Jose Luis; Farran Marsa, Adriana; Gamisans Noguera, Javier; de las Heras Cisa, F. Xavier
    Reactive and functional polymers
    Date of publication: 2008-03
    Journal article

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    The search for suitable sorbents for persistent organic pollutants (like dyes) removal from aqueous solutions has prompted the evaluation of polymeric resins incorporating new properties that solve many of the existing problems when using granular activated carbon (GAC). A new type of non-functionalized macroporous hyper-cross-linked polymers Hypersol Macronet (MN200 and MN300) has been evaluated and kinetics measurements on the extraction of azo dye (Acid red 14) were made. Analyses of the respective batch rate data with two kinetic models, the homogenous particle diffusion model (HPDM)and the shell progressive model (SPM) were carried out. Sorbent phase was confirmed as the rate-determining step of the dye sorption process. Effective particle diffusion coefficients (Deff) were determined from the rate data proposed by both models. The Deff values from both HPMD and SPM equations varied from 5 10 13 to 4 10 16 m2 s 1. Weber and Morris intra-particle diffusion model showed a double contribution of the surface and pore diffusivities to the sorption process. Pore and surface diffusivities were calculated using a heterogeneous model. Hyper-cross-linked polymers reported a double contribution (pore and surface) to the overall diffusion process meanwhile GAC coefficients indicate a surface diffusion as the controlling mechanism.

  • Evaluation of hyper-cross-linked polymeric sorbents (Macronet MN200 and MN300) on dye (Acid red 14) removal process

     Valderrama Angel, Cesar Alberto; Cortina Pallas, Jose Luis; Farran Marsa, Adriana; Gamisans Noguera, Javier; de las Heras Cisa, F. Xavier
    Reactive and functional polymers
    Date of publication: 2008-03
    Journal article

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    Polymeric supports are presented as an alternative to granular activated carbon (GAC) for organic contaminants removal from waste waters from industrial processes. The present work describes the sorption of an azo dye (Acid red 14) from aqueous solution onto Macronet polymeric sorbent MN200 and MN300. Batch experiments were performed to determine loading isotherms and loading rates at different pH. The behaviour of a non-functionalized Macronet support MN200 was compared with Macronet MN300 containing tertiary amine groups. The loadings achieved were 65 g kg 1 for MN200 and 108 g kg 1 for MN300. The influence of the acidity on dye removal was notable; the decrease of pH provides an increase on the loading around 100% of the value reported at neutral pH. Equilibrium data were modelled with Langmuir, Freundlich and Redlich–Peterson isotherms. The hyper-cross-linked polymers extract Acid red 14, via a complex sorption process depending on the aqueous feed composition and depending on the nature of the sorbent evaluated. The Redlich–Peterson isotherm provides a better description of sorption data for both resins. Kinetic experiments were carried out for both sorbents at different pH and azo dye concentrations. Three theoretical models (pseudo-first, pseudo-second-order reaction and the Elovich model) were used to describe the Acid red 14 sorption kinetics, and to determine the sorption rate constants by graphical and numerical analysis of the experimental data by using the proposed models. The study showed that sorption systems followed a pseudo-first-order reaction model although the pseudo-second-order reaction model provides a good description of the sorption process.

  • 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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  • Sorption kinetics of polycyclic aromatic hidrocarbons removal using granular activated carbon: intraparticle difussion coefficients

     Valderrama Angel, Cesar Alberto; Gamisans Noguera, Javier; de las Heras Cisa, F. Xavier; Farran Marsa, Adriana; Cortina Pallas, Jose Luis
    Journal of hazardous materials
    Date of publication: 2008-09
    Journal article

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    Granular activated carbon (GAC) was evaluated as a suitable sorbent for polycyclic aromatic hydrocarbons (PAHs) removal from aqueous solutions. For this purpose, kinetic measurements on the extraction of a family of six PAHs were taken. A morphology study was performed by means of a scanning electron microscopy (SEM) analysis of GAC samples. Analyses of the batch rate data for each PAH were carried out using two kinetic models: the homogenous particle diffusion model (HPDM) and the shell progressive model (SPM). The process was controlled by diffusion rate the solutes (PAHs) that penetrated the reacted layer at PAH concentrations in the range of 0.2–10 mg L−1. The effective particle diffusion coefficients (Deff) derived from the two models were determined from the batch rate data. The Weber and Morris intraparticle diffusion model made a double contribution to the surface and pore diffusivities in the sorption process. The Deff values derived from both the HPMD and SPM equations varied from 1.1×10−13 to 6.0×10−14 m2 s−1. The simplest model, the pore diffusion model, was applied first for data analysis. The model of the next level of complexity, the surface diffusion model, was applied in order to gain a deeper understanding of the diffusion process. This model is able to explain the data, and the apparent surface diffusivities are in the same order of magnitude as the values for the sorption of functionalized aromatic hydrocarbons (phenols and sulphonates)that are described in the literature.

  • Kinetics of polycyclic aromatic hydrocarbons removal using hyper-cross-linked polymeric sorbents Macronet Hypersol MN200

     Valderrama Angel, Cesar Alberto; Gamisans Noguera, Javier; de las Heras Cisa, F. Xavier; Cortina Pallas, Jose Luis; Farran Marsa, Adriana
    Reactive and functional polymers
    Date of publication: 2007-12
    Journal article

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  • Kinetics of sorption of polyaromatic hydrocarbons onto granular activated carbon and Macronet hyper-cross-linked polymers (MN200)

     Valderrama, C; Cortina Pallas, Jose Luis; Farran Marsa, Adriana; Gamisans Noguera, Javier; Lao Luque, Concepcion
    Journal of colloid and interface science
    Date of publication: 2007-06
    Journal article

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  • Micro-pollutants remediation from soil and groundwater by in-situ treatment technologies  awarded activity

     Valderrama Angel, Cesar Alberto
    Defense's date: 2007-07-20
    Department of Mining Engineering and Natural Resources, Universitat Politècnica de Catalunya
    Theses

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  • Kinetics of sorption of polyaromatic hydrocarbons onto granular activated carbon and Macronet hyper-cross-linked polymers (MN200)

     Valderrama Angel, Cesar Alberto; Cortina Pallas, Jose Luis; Farran Marsa, Adriana; Gamisans Noguera, Javier; Lao Luque, Concepcion
    Journal of colloid and interface science
    Date of publication: 2007-06-01
    Journal article

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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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  • Evaluation of macronet polymeric adsorbents for removal of PAH's from contaminated soil and groundwater

     Valderrama, C; Gamisans Noguera, Javier; Lao Luque, Concepcion; Farran Marsa, Adriana; Cortina Pallas, Jose Luis
    9th International FZK/TNO Conference on Soil-Water Systems (Consoil 2005)
    Presentation of work at congresses

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  • Equilibris químics en dissolució

     Aguilar Sanjuan, Manuel; Casas Pons, Ignasi; Cortina Pallas, Jose Luis; Farran Marsa, Adriana; Florido Pérez, Antonio; Gimenez Izquierdo, Francisco Javier; Martínez Martínez, María R.; Miralles Esteban, Nuria; Pablo Ribas, Joan de; Sastre Requena, Ana Maria
    Date of publication: 2005-09
    Book

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  • Laboratory Evaluation of PAH oxidation by magnesium peroxides and iron oxides mixtures as reactive material for groundwater remediation

     Valderrama, C; Gamisans Noguera, Javier; Cortina Pallas, Jose Luis; Farran Marsa, Adriana; Marti Gregorio, Vicenç; Lao Luque, Concepcion
    9th International FZK/TNO Conference on Soil-Water Systems (Consoil 2005)
    Presentation of work at congresses

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  • Application of SPE and MECC to the study of hydrolitic and photolytic degradation of phenoxyalkyl and phenylurea herbicides

     Farran Marsa, Adriana; Ruiz Boque, Silvia
    Journal of chromatography A
    Date of publication: 2004-06
    Journal article

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  • Exàmens de Química I

     Casas Pons, Ignasi; Cortina Pallas, Jose Luis; Farran Marsa, Adriana; Florido Pérez, Antonio; Gimenez Izquierdo, Francisco Javier; Martínez Martínez, María R.; Miralles Esteban, Nuria; Pablo Ribas, Joan de; Rovira Boixaderas, Miguel Arcangel; Sastre Requena, Ana Maria
    Date of publication: 2004-07
    Book

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  • Pràctiques de Química I i Ampliació de Química I: reaccions inorgàniques

     Aguilar Sanjuan, Manuel; Casas Pons, Ignasi; Cortina Pallas, Jose Luis; Farran Marsa, Adriana; Florido Pérez, Antonio; Gimenez Izquierdo, Francisco Javier; Martínez Martínez, María R.; Miralles Esteban, Nuria; Pablo Ribas, Joan de; Sastre Requena, Ana Maria
    Date of publication: 2004-04
    Book

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  • Prediction of the octanol-water distribution of dithiocarbamate derivatives

     Rogachev, I; Serra, C; Farran Marsa, Adriana; Cortina Pallas, Jose Luis; Gressel, J; Warshawsky, A
    Reactive and functional polymers
    Date of publication: 2003-02
    Journal article

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  • Evaluation apatite ii?µ as reactive material for passive metal removal from grounwater

     Oliva, J; Cortina Pallas, Jose Luis; Pablo Ribas, Joan de; Farran Marsa, Adriana; Cama, C.; Ayora Ibáñez, Carlos; Conca, J.; Wright, Joseph
    Contaminated Soils 2003
    Presentation of work at congresses

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  • Equilibri iònic i cinètica. Problemes

     Aguilar Sanjuan, Manuel; Casas Pons, Ignasi; Cortina Pallas, Jose Luis; Farran Marsa, Adriana; Florido Pérez, Antonio; Gimenez Izquierdo, Francisco Javier; Martínez Martínez, María R.; Miralles Esteban, Nuria; Pablo Ribas, Joan de; Sastre Requena, Ana Maria
    Date of publication: 2003-09
    Book

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  • DESARROLLO DE NUEVAS TECNOLOGIAS DE RESTAURACION DE SUELOS Y ACUIFEROS CONTAMINADOS POR COMPUESTOS ORGANICOS.

     Cortina Pallas, Jose Luis; Farran Marsa, Adriana
    Participation in a competitive project

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  • Desarrollo de nuevas tecnologías de restauración de suelos y acuíferos contaminados por compuestos orgánicos

     Gimenez Izquierdo, Francisco Javier; Farran Marsa, Adriana
    Participation in a competitive project

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  • Desarrollo de métodos de electroforesis capilar en fase micelar. Aplicación al análisis de herbicidas y de sus productos de degradación  Open access

     Ruiz Marrondo, Santiago
    Defense's date: 2001-10-02
    Department of Chemical Engineering, Universitat Politècnica de Catalunya
    Theses

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    La Electroforesis Capilar en Fase Micelar (MECC) es una nueva técnica de separación desarrollada a partir de la Electroforesis Capilar en Zona (CZE) y basada en principios tanto cromatográficos como electroforéticos, capaz de separar compuestos aniónicos y neutros conjuntamente: mientras que para los compuestos neutros el fundamento de la separación es similar al de la cromatografía líquida, para los compuestos aniónicos la separación está basada principalmente en sus diferentes movilidades electroforéticas.La presente tesis doctoral se ha planteado con el objetivo principal de profundizar en esta técnica analítica y estudiar su aplicación en la determinación de compuestos de interés medioambiental, concretamente herbicidas de las familias de los fenoxiácidos y las fenilureas y productos derivados de su degradación. Para ello se ha dividido la memoria en 5 capítulos:En el capítulo 1º se realiza una introducción de la técnica CZE, estudiándose fundamentos teóricos de separación y detección y su instrumentación. Finalmente se realiza un pequeño estudio experimental de separación de varios herbicidas fenoxiácidos. Con ello se obtiene una base teórica y experimental sobre la Electroforesis Capilar necesaria para el capítulo 2º, en el cual se profundiza en el análisis mediante MECC. En este capítulo se estudian las bases teóricas de esta técnica y se aplica en la resolución de una mezcla de herbicidas fenoxiácidos y fenilureicos. El estudio de la técnica MECC se completa en el capítulo 3º, donde se optimiza la separación de la mezcla de los herbicidas adicionando a la disolución de trabajo diferentes alcoholes alifáticos. Se discuten las variaciones experimentales observadas y se desarrolla un modelo teórico que explica estas variaciones. En este modelo entran en juego factores como las características fisico-químicas de las micelas y sus variaciones cuando están en contacto con alcoholes lineales.En el capítulo 4º intentamos superar una de las mayores limitaciones de la Electroforesis Capilar que es la falta de sensibilidad. Para ello se desarrollan sistemas de pre-concentración de la muestra on-line, basados en la inyección de grandes volúmenes de muestra y la posterior eliminación de parte la matriz que contiene esta muestra, y sistemas de pre-concentración off-line mediante columnas de extracción en fase sólida de carbono grafitizado. Con estos dos procedimientos de concentración se consigue llegar a las sensibilidades necesarias para utilizar el sistema MECC en el análisis de pesticidas de muestras medioambientales.Toda la información obtenida en los capítulos anteriores es aplicada en el capítulo 5º en un estudio de degradación de varios herbicidas fenoxiácidos y fenilureicos. Para ello se tuvo en cuenta diversas vías de degradación como son la fotodegradación o la hidrólisis, y diferentes condiciones ambientales. Con este estudio se consiguieron datos relevantes en la comprensión de los mecanismos de degradación de los herbicidas estudiados: cinéticas de reacción y constantes de velocidad de degradación, productos de derivados de la fotodegradación y la hidrólisis, etc.

    Micellar Electrokinetic Capillary Chromatography (MECC) is a new separation technique developed from Capillary Zone Electrophoresis (CZE) and based on chromatographic and electrophoretic principles. It is able to separate anionic and neutral compounds simultaneously. The separation of neutral compounds by MECC is similar to that by Liquid Chromatography. For anionic compounds, the separation is largely based on its different electrophoretic mobilities. The main objective of this doctoral thesis is to study this analytical technique and its application in the determination of compounds of environmental interest, concretely, phenylurea and phenoxyalkyl acid herbicides and products derived of their degradation. The thesis has been divided in 5 chapters: In the 1st chapter, it is carried out an introduction of CZE procedure, being considered theoretical principles of separation and detection and their instrumentation. It finishes by performing a brief experimental study of separation of several phenoxyalkyl acid herbicides. We obtain a theoretical and experimental basis about Capillary Zone Electrophoresis required in 2nd chapter, in which we examine the analytical technique MECC. In this chapter, the theoretical principles of this technique are developed and applied in the resolution of a mixture of phenylurea and phenoxyalkyl acid herbicides. The study of MECC is completed in 3rd chapter, where the separation of the mixture of herbicides is optimised adding aliphatic alcohols. The observed experimental variations are discussed and explained by a theoretical model. In this model, it is explained factors like the physico-chemical characteristics of the micelles and their variations when they are in contact with aliphatic alcohols. In the 3rd chapter, we try to overcome one of the biggest limitations in the Capillary Electrophoresis: the sensibility. We develop on-column sample pre-concentration systems, based on the injection of a very large volume of sample and the elimination of the sample matrix. We also expose off-column sample pre-concentration systems by means of solid phase extraction cartridge of graphitized carbon black. With these concentration procedures, it was possible to achieve the necessary sensibilities to use MECC system in environmental analysis. All the information obtained in previous chapters is applied in 5th chapter in a degradation study of several phenylurea and phenoxyalkyl acid herbicides. We kept in mind various degradation processes like photodegradation or hydrolysis and different environmental conditions. We reach interesting data to the understanding of degradation mechanisms of the determined herbicides: kinetic of reaction and degradation constants, products derived of photodegradation and hydrolysis, et cetera.

  • Desarrollo de un sistema integral para monitorización in situ de metales pesados  Open access

     Arturo Díaz Rengifo, Juan
    Defense's date: 2001-03-27
    Department of Mining Engineering and Natural Resources, Universitat Politècnica de Catalunya
    Theses

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    El presente trabajo de investigación titulado "Desarrollo de un Sistema Integrado para Monitorización "in situ" de metales pesados", trata de la puesta en marcha de un nuevo sistema de medida potenciométrico portátil para la determinación cuantitativa de metales pesados tóxicos al medio ambiente para medidas en el campo.Comprende tres áreas disciplinarias: En la primera área, la electroquímica, se desarrollan sensores químicos que a su vez se dividen en tres etapas: En la primera etapa, se estudia la fabricación de electrodos convencionales de cabezal reemplazable selectivos a los cationes de cobre(II), cadmio(II) y plomo(II). En la segunda etapa, el estudio de nuevos electrodos selectivos a los mismos cationes del estudio anterior en configuración plana basado en tecnología "thick film", adaptada a nuestras necesidades de fabricación mediante la técnica de moldeo ("casting"). Por último, en la tercera etapa, se estudia la fabricación de electrodos de referencia de configuración plana con la misma tecnología.La segunda área es la informática, en la que se desarrolla un paquete de herramientas basado en "software" de LabVIEW versión 5.1, con el nombre de Instrumentación Virtual para el Control Potenciométrico de Sensores Químicos, (en inglés "VIPCCHES"). Este paquete está capacitado para el tratamiento de la información que contienen las señales analíticas procdentes de los sensores. Tiene tres funciones importantes. La primera función es la calibración de los electrodos por dos métodos: calibración externa continua y calibración externa discontinua, ambos en dos modos de operación, modo individual y modo "array" de electrodos.Una segunda función del paquete VIPCCHES es la adquisición de datos en modo continuo de un electrodo o un array de electrodos, permitiendo al usuario programar las medidas necesarias en tiempos de adquisición variables. La tercera función operativa del programa, es la realización de análisis de muestras de metales para un electrodo o un "array" de electrodos. El valor de la señal adquirida es promediado y éste es confrontado con una curva de calibración del electrodo plano de manera automática, presentando los resultados de manera gráfica y numérica. Finalmente, los resultados pueden ser tratados mediante programas estándar tipo Excel.En el área de la electrónica, se ha construido un dispositivo para procesar las señales que proceden de los electrodos planos de nombre "SPPAE" que permite la adecuación de las señales a la Tarjeta de Adquisición de Datos (TAD) en el ordenador. Está diseñado con filosofía de expansión, por medio de módulos de amplificación y filtrado (anti-aliasing) que se insertan en un Bus de alimentación.La integración de estos tres sistemas (electrodos de configuración plana, el SPPAE y el VIPCCHES) forman parte del Sistema Integrado para Monitorización Ambiental que conocemos como SIMA estando dicho sistema capacitado para realizar análisis "in situ" de metales pesados.

    In this work, a Integrated System for monitoring in situ of heavy metals was developed. Include three disciplinary areas, the electronic, the information technology and the electrochemical. The first step was development now chemical sensors selective to cationes using thick film technology. The second task was the development of one virtual instrument (VI), which is the essential part of the system, using the graphical programming language LabVIEW which is capable of performing measurements functions, including data acquisition, display, analysis in the time and frequency domains, data archiving and read to file. Finally its build a signals processor, for the now plane and miniaturised electrodes. The installations of these elements in a portable computer consist in the Integrated System.Keywords: thick film, chemical sensors, integrated systems, virtual instrumentation, signals processor, in situ measurements, monitoring, heavy metals.

  • The use of CE and ICP-ES for the analysis of metals, cyanide compounds and SCN- in leaching solutions

     Marti Gregorio, Vicenç; Meinhardt, E; Farran Marsa, Adriana; Cortina Pallas, Jose Luis; Aguilar Sanjuan, Manuel
    Química analítica
    Date of publication: 2000-06
    Journal article

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  • Study of the behaviour of azinphos-methyl in a clay mineral by batch and column leaching

     Farran Marsa, Adriana; Chentouf, A
    Journal of chromatography A
    Date of publication: 2000-10
    Journal article

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  • Sensores químicos thick film planos para la determinación de metales pesados

     Farran Marsa, Adriana
    5ª Trobada transfronterera sobre sensors i biosensors
    Presentation's date: 2000-09-20
    Presentation of work at congresses

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  • HID99-1147-C02-01 Barreras geoquímicas pasivas como instrumento de remediación de aguas contaminadas con metales. Diseño experimental y modelización

     Cortina Pallas, Jose Luis; Pablo Ribas, Joan de; Florido Pérez, Antonio; Martínez Martínez, María R.; Farran Marsa, Adriana
    Participation in a competitive project

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  • Instrumentación virtual en el entorno Labview para el control de metales pesados

     Farran Marsa, Adriana
    5ª Trobada transfronterera sobre sensors i biosensors
    Presentation's date: 2000-09-20
    Presentation of work at congresses

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  • Three different approaches for the separation of MCPA and 2,4-D by CE

     Farran Marsa, Adriana; Serra, C; Sepaniak, M J
    Journal of chromatography A
    Date of publication: 1999-03
    Journal article

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  • Experimental designs and response surface modelling applied for the optimization of metal-cyanide complexes analysis by CE

     Marti Gregorio, Vicenç; Aguilar Sanjuan, Manuel; Farran Marsa, Adriana
    Electrophoresis
    Date of publication: 1999-11
    Journal article

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  • Determination of cyanides in electroplating solutions by derivatization to Ni(CN)42- and analysis by capillary electrophoresis

     Farran Marsa, Adriana; Aguilar Sanjuan, Manuel; Marti Gregorio, Vicenç
    Fresenius journal of analytical chemistry
    Date of publication: 1999-01
    Journal article

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  • Application of different CE methodologies to the analysis of chlorpyrifos in soil samples

     Farran Marsa, Adriana
    23rd International Symposium On High Performance Liquid Phase Separations and Related Techniques
    Presentation's date: 1999-06-12
    Presentation of work at congresses

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  • Validation of a methematical model to evaluate the behaviour of pesticides in soils by column leaching studies and HPLC analysis

     Farran Marsa, Adriana
    23rd International Symposium On High Performance Liquid Phase Separations and Related Techniques
    Presentation's date: 1999-06-12
    Presentation of work at congresses

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  • Determination of chlorpyriphos in air, leaves and soil from a greenhouse by GC-NPD, HPLC and CE

     Obiols, J.; Rosell, M. G.; Farran Marsa, Adriana; Serra, C.; Guardino Solà, Xavier
    Journal of chromatography A
    Date of publication: 1998-10
    Journal article

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