Browsing Articles publicats (Agrotecnio Center) by Author "Galceran i Nogués, Josep"
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A review on electrochemical methods for trace metal speciation in environmental media
Companys Ferran, Encarnació; Galceran i Nogués, Josep; Pinheiro, Jose Paulo; Puy Llorens, Jaume; Salaün, Pascal (Elsevier, 2017)Trace metal speciation is key to understand/predict bioavailability and potential toxicity of metals to biota and will, undoubtedly, be incorporated in future regulations. Electroanalytical methods have a role to play in ... -
Absence of Gradients and Nernstian Equilibrium Stripping (AGNES) for the determination of [Zn2+] in estuarine waters
Pearson, Holly B. C.; Galceran i Nogués, Josep; Companys Ferran, Encarnació; Braungardt,Charlotte B.; Worsfold,Paul; Puy Llorens, Jaume; Comber, Sean (Elsevier, 2016-03-17)Zinc (Zn) has been classified as a 'Specific Pollutant' under Annex VIII of the EU Water Framework Directive by two thirds of the EU member states. As a result, the UK Environmental Quality Standard (EQS) for Transitional ... -
Accumulation of Mg to Diffusive Gradients in Thin Films (DGT) devices: Kinetic and thermodynamic effects of the ionic strength
Altier Infantes, Alexandra; Jiménez-Piedrahita, Martín; Rey Castro, Carlos; Cecilia Averós, Joan; Galceran i Nogués, Josep; Puy Llorens, Jaume (American Chemical Society, 2016-09-23)Availability of magnesium is a matter of concern due to its role in many environmental and biological processes. Diffusive Gradients in Thin Films (DGT) devices can measure Mg availability in situ. This work shows that Mg ... -
AGNES at vibrated gold microwire electrode for the direct quantification of free copper concentrations
Domingos, Rute F.; Carreira, Sara; Galceran i Nogués, Josep; Salaün, Pascal; Pinheiro, Jose Paulo (Elsevier, 2016-05-12)The free metal ion concentration and the dynamic features of the metal species are recognized as key to predict metal bioavailability and toxicity to aquatic organisms. Quantification of the former is, however, still ... -
AGNES in irreversible systems: The indium case
Galceran i Nogués, Josep; Companys Ferran, Encarnació; Puy Llorens, Jaume; Pinheiro, Jose Paulo; Rotureau, Elise (Elsevier, 2021)Free indium concentrations can be determined using AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) with no relevant hindrance from the irreversibility of the In3+/In° redox couple at a mercury electrode. ... -
Antimony speciation in aqueous solution followed with AGNES
Pla-Vilanova, Pepita; Galceran i Nogués, Josep; Puy Llorens, Jaume; Companys Ferran, Encarnació; Filella, Montserrat (Elsevier, 2019-09-29)Determining antimony speciation is essential to understand its environmental behaviour and potential (eco)toxicological effects. Absence of Gradients and Nemstian Equilibrium Stripping (AGNES) is an electroanalytical ... -
Assessment of labilities of metal complexes with the dynamic ion exchange technique
Quattrini, Federico; Galceran i Nogués, Josep; Rey Castro, Carlos; Puy Llorens, Jaume; Fortin, Claude (CSIRO Publishing, 2019)The dynamic ion exchange technique (DIET) is proposed to provide speciation information, which can be used to establish links with metal bioavailability in natural waters. The experimental setup consists of a few milligrams ... -
Availability of metals to DGT devices with different configurations. The case of sequential Ni complexation
Sans Duñó, Jordi; Cecilia, Joan; Galceran i Nogués, Josep; Puy Llorens, Jaume (Elsevier, 2021-07)The analytical technique DGT (Diffusive Gradients in Thin-films) is able to gain access to a wealth of information by carefully interpreting accumulation data from passive samplers with different configurations (i.e. ... -
Comparison of different speciation techniques to measure Zn availability in hydroponic media
Companys Ferran, Encarnació; Galceran i Nogués, Josep; Puy Llorens, Jaume; Sedó, Maria; Vera, Ruben; Anticó, Enriqueta; Fontàs, Claudia (Elsevier, 2018-12)Four analytical techniques are compared: AGNES (Absence of Gradients and Nernstian Equilibrium Stripping), LASV (Anodic Stripping Voltammetry with Linear stripping), DGT (Diffusive Gradients in Thin films) and PIM (Polymer ... -
Determination of the free metal Ion concentration using AGNES Implemented with environmentally friendly bismuth film electrodes
Rocha, Luciana S.; Galceran i Nogués, Josep; Puy Llorens, Jaume; Pinheiro, Jose Paulo (American Chemical Society, 2015-06-16)Ex-situ plated Bi film electrodes (Bi-FE) have been employed, for the first time, to measure the free concentration of Pb(II) in aqueous solutions using AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) with ... -
Dissolution and phosphate-induced transformation of ZnO nanoparticles in synthetic saliva probed by AGNES without previous solid-liquid separation. Comparison with UF-ICP-MS
David, Calin; Galceran i Nogués, Josep; Quattrini, Federico; Puy Llorens, Jaume; Rey Castro, Carlos (American Chemical Society, 2019-02-26)The variation over time of free Zn2+ ion concentration in stirred dispersions of ZnO nanoparticles (ZnO NPs) prepared in synthetic saliva at pH 6.80 and 37 degrees C was followed in situ (without solid liquid separation ... -
Dynamics of trace metal sorption by an ion-exchange chelating resin described by a mixed intraparticle/film diffusion transport model. The Cd/Chelex case
Quattrini, Federico; Galceran i Nogués, Josep; David, Calin; Puy Llorens, Jaume; Alberti, Giancarla; Rey Castro, Carlos (Elsevier, 2017-06-01)The time-evolution of Cd2+ ion sorption by Chelex 100 resin was studied in batch experiments as a function of time, pH, ionic strength, stirring rate, mass of resin and initial metal ion concentration. In the experimental ... -
Effective concentration signature of Zn in a natural water derived from various speciation techniques
Rosales Segovia, Kevin; Companys Ferran, Encarnació; Sans Duñó, Jordi; Puy Llorens, Jaume; Alcalde, Berta; Anticó, Enriqueta; Fontàs, Clàudia; Galceran i Nogués, Josep (Elsevier, 2022-02)The uptake of nutrients or toxicants by different organisms in aquatic systems is known to correlate with different fractions of the nutrient's or toxicant's total concentration. These fractions can be provided by different ... -
Effects of a mixture of ligands on metal accumulation in diffusive gradients in thin films (DGT)
Altier Infantes, Alexandra; Jiménez-Piedrahita, Martín; Uribe Kaffure, Ramiro; Rey Castro, Carlos; Cecilia Averós, Joan; Galceran i Nogués, Josep; Puy Llorens, Jaume (CSIRO Publishing, 2018)Natural waters contain mixtures of ligands, which collectively affect the availability of trace metals. The individual contribution of each complex to the overall metal flux received by a sensor can be described in terms ... -
Extending the use of Diffusive Gradients in Thin Films (DGT) to solutions where competition, saturation, and kinetic effects are not negligible
Jiménez-Piedrahita, Martín; Altier Infantes, Alexandra; Cecilia Averós, Joan; Puy Llorens, Jaume; Galceran i Nogués, Josep; Rey Castro, Carlos; Zhang, Hao; Davison, William (American Chemical Society, 2017-06-20)DGT (Diffusion Gradients in Thin films) was designed to sample trace metals in situ at their natural concentrations. The setup and the experimental deployment conditions were established to allow interpretation of a linear ... -
Foreword to the special issue from the Interfaces Against Pollution 2016 Conference: Environmental challenges and opportunities
Waite, T. David; Duval, Jérôme F. L.; Sander, Michael; Puy Llorens, Jaume; Galceran i Nogués, Josep; Rey Castro, Carlos (CSIRO Publishing, 2017-01-01) -
Free indium concentration determined with AGNES
Tehrani, Marjan H.; Companys Ferran, Encarnació; Dago Busquets, Àngela; Puy Llorens, Jaume; Galceran i Nogués, Josep (Elsevier, 2018)Indium is increasingly used in electronic devices, from which it can be mobilized towards environmental compartments. Speciation of In in waters is important for its direct ecotoxicological effects, as well as for the fate ... -
Free Zn2+ determination in natural freshwater of the Pyrenees: towards on-site measurements with AGNES
Parat, C.; Authier, L.; Castetbon,A.; Aguilar Camaño, David; Companys Ferran, Encarnació; Puy Llorens, Jaume; Galceran i Nogués, Josep; Potin-Gautier, M. (CSIRO Publishing, 2015)An on-site methodology has been developed for the direct determination of free Zn2+ with AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) in freshwaters. This implementation includes: i) the use of screen ... -
Free Zn2+ determination in systems with Zn-Glutathione
Lao, Mireia; Dago Busquets, Àngela; Serrano, N.; Companys Ferran, Encarnació; Puy Llorens, Jaume; Galceran i Nogués, Josep (Elsevier, 2015-11-01)Zn-Glutathione speciation was studied applying the electrochemical technique AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) to determine the free zinc concentration. In titrations varying either pH, total ... -
Full wave analysis of stripping chronopotentiometry at scanned deposition potential (SSCP): obtaining binding curves in labile heterogeneous macromolecular systems for any metal-toligand ratio.
Pinheiro, José-Paulo; Galceran i Nogués, Josep; Rotureau, Elise; Companys Ferran, Encarnació; Puy Llorens, Jaume (Elsevier, 2020)The different deposition potentials applied in Scanned Stripping ChronoPotentiometry (SSCP) probe different values of the free metal and complex concentrations at the electrode surface. The knowledge of these concentrations ...