Now showing items 21-35 of 35

    • In situ measurements of micronutrient dynamics in open seawater show that complex dissociation rates may limit diatom growth 

      Baeyens, Willy; Gao, Yue; Davison, William; Galceran i Nogués, Josep; Leermakers, Martine; Puy Llorens, Jaume; Superville, Pierre-Jean; Beguery, Laurent (Nature Research, 2018-12)
      In this first in situ study of the dynamic availability of phytoplankton micronutrients, a SeaExplorer glider was combined with Diffusive Gradients in Thin Films and deployed in the Mediterranean Sea. On the basis of their ...
    • Interpretation of diffusion gradients in thin films (DGT) measurements: a systematic approach 

      Galceran i Nogués, Josep; Puy Llorens, Jaume (CSIRO Publishing, 2015)
      Gaining insight into the physicochemical processes integrated in a DGT (diffusion gradients in thin films) measurement and combining them in a model can assist in retrieving fundamental information, both qualitative and ...
    • Labile trace metal concentration measurements in marine environments: From coastal to open ocean areas 

      Gao, Yue; Zhou, Chunyang; Gaulier, Camille; Bratkic, Arne; Galceran i Nogués, Josep; Puy Llorens, Jaume; Zhang, Hao; Leermakers, Martine; Baeyens, Willy (Elsevier, 2019-05-06)
      In seawater, trace metals occur in many forms: free ion, labile and non-labile complex, colloid, associated with particles, but only free ions and very labile metal complexes can cross the phytoplankton membrane and be ...
    • Metal (Pb, Cd, and Zn) Binding to Diverse Organic Matter Samples and Implications for Speciation Modeling 

      Chen, Weibin; Guéguen, Céline; Smith, D. Scott; Galceran i Nogués, Josep; Puy Llorens, Jaume; Companys Ferran, Encarnació (American Chemical Society, 2018)
      This study evaluated the influence of dissolved organic matter (DOM) properties on the speciation of Pb, Zn and Cd. Six DOM samples were categorized into autochthonous and allochthonous source based on their absorbance and ...
    • New methodology to measure low free indium (III) concentrations based on the determination of the lability degree of indium complexes. Assessment of In(OH)3 solubility product 

      Tehrani, Marjan H.; Companys Ferran, Encarnació; Dago Busquets, Àngela; Puy Llorens, Jaume; Galceran i Nogués, Josep (Elsevier B.V., 2019)
      The vast industrial and consumer application of indium (solar cells, displays, etc.) risks its eventual leakage to the environment. Given the relevant role of speciation on the ecotoxicological effects of a certain total ...
    • Non-purged voltammetry explored with AGNES 

      Aguilar Camaño, David; Galceran i Nogués, Josep; Companys Ferran, Encarnació; Puy Llorens, Jaume; Parat, C.; Authier, L.; Potin-Gautier, M. (Royal Society of Chemistry, 2013)
      The reduction of oxygen increases pH in the surroundings of an electrode. A theoretical model estimates the steady-state pH profile from the surface of the electrode up to the bulk solution. A very simple formula predicts ...
    • Polymer inclusion membrane to access Zn speciation: Comparison with root uptake 

      Vera, Ruben; Fontàs, Claudia; Galceran i Nogués, Josep; Serra, Olga; Anticó, Enriqueta (Elsevier, 2018)
      Metal speciation studies can be performed with a new technique based on a functionalized membrane. The estimation of not only the total amount of metal, but also the metal available to living organisms is very important. ...
    • Prepartum blood lead concentrations linked to subsequent cyclicity in high-producing dairy cows in a non-industrial area 

      García Ispierto, Irina; López-Helguera, Irene; Ramos Girona, Antonio J.; Marín Sillué, Sònia; Companys Ferran, Encarnació; Puy Llorens, Jaume; Galceran i Nogués, Josep; De Rensis, F.; López Gatius, Fernando (Elsevier, 2016-09-01)
      This study sought to identify the possible presence of lead (Pb) in blood and if detected to examine the relationship between blood Pb concentrations during the transition period and subsequent reproductive performance in ...
    • Speciation of Inorganic Compounds in Aquatic Systems Using Diffusive Gradients in Thin-Films: A Review 

      Galceran i Nogués, Josep; Gao, Yue; Puy Llorens, Jaume; Leermakers, Martine; Rey Castro, Carlos; Zhou, Chunyang; Baeyens, Willy (Frontiers Media, 2021)
      The speciation of trace metals in an aquatic system involves the determination of free ions, complexes (labile and non-labile), colloids, and the total dissolved concentration. In this paper, we review the integrated ...
    • Speciation of Zn, Fe, Ca and Mg in wine with the Donnan Membrane Technique 

      Lao, Mireia; Companys Ferran, Encarnació; Weng, Liping; Puy Llorens, Jaume; Galceran i Nogués, Josep (Elsevier, 2018)
      Free concentrations of Zn2+, Fe3+, Ca2+ and Mg2+ in a red wine (Raimat, Catalonia, Spain) have been determined, with the Donnan Membrane Technique (DMT) for the first time. The required equilibration time benefits from the ...
    • Systematic Investigation of the Physicochemical Factors That Contribute to the Toxicity of ZnO Nanoparticles 

      Mu, Qingshan; David, Calin; Galceran i Nogués, Josep; Rey Castro, Carlos; Krzemiński, Łukasz; Wallace, Rachel; Bamiduro, Faith; Milne, Steven J.; Hondow, Nicole S.; Brydson, Rik; Vizcay-Barrena, Gema; Routledge, Michael N.; Jeuken, Lars J. C.; Brown, Andy P. (American Chemical Society, 2014)
      ZnO nanoparticles (NPs) are prone to dissolution, and uncertainty remains whether biological/cellular responses to ZnO NPs are solely due to the release of Zn2+ or whether the NPs themselves have additional toxic effects. ...
    • The impact of electrodic adsorption on Zn, Cd and Pb speciation measurements with AGNES 

      Galceran i Nogués, Josep; Lao, Mireia; David, Calin; Companys Ferran, Encarnació; Rey Castro, Carlos; Salvador, José; Puy Llorens, Jaume (Elsevier, 2014-05-27)
      The systems assayed in this work (Cd with iodide, Cd with polyacrylic acid, Pb or Zn with xylenol orange, etc.) as well as others previously studied in our lab (Pb/Cd/Zn with humic acids, Pb with pyridinedicarboxylic acid, ...
    • Theoretical aspects of dynamic metal speciation with electrochemical techniques 

      Puy Llorens, Jaume; Galceran i Nogués, Josep (Elsevier, 2017)
      Understanding the reaction-diffusion processes of metal species is essential for an adequate description and control of metal availability. Electroanalytical techniques are well suited to probe dynamic speciation in aqueous ...
    • Time weighted average concentrations measured with Diffusive Gradients in Thin films (DGT) 

      Altier Infantes, Alexandra; Jiménez-Piedrahita, Martín; Uribe Kaffure, Ramiro; Rey Castro, Carlos; Galceran i Nogués, Josep; Puy Llorens, Jaume (Elsevier, 2019-07-04)
      Time weighted average (TWA) concentrations can improve the assessment of water quality. DGT (Diffusive Gradients in Thin films) devices have been suggested as simple tools to measure TWA metal concentrations, but the ...
    • Towards improving the electroanalytical speciation analysis of indium 

      Rotureau, Elise; Pla-Vilanova, Pepita; Galceran i Nogués, Josep; Companys Ferran, Encarnació; Pinheiro, Jose Paulo (Elsevier, 2019)
      The geochemical fate of indium in natural waters is still poorly understood, while recent studies have pointed out a growing input of this trivalent element in the environment as a result of its utilisation in the manufacturing ...