AGNES: a technique for determining the concentration of free metal ions. The case of Zn(II) in coastal Mediterranean seawater
Huidobro Redondo, César
MetadataShow full item record
Absence of Gradients and Nernstian Equilibrium Stripping (AGNES) is a recently suggested electroanalytical technique designed for the determination of the free concentration of heavy metals (such as Zn, Cd or Pb) which is here developed and applied to seawater samples. A key improvement for the implementation of AGNES with complex matrices is the development of a new blank, called the shifted blank (presented in this work for the first time), which can be applied to the same sample where the measurement is intended. The careful selection of the required parameters for the determination of the free Zn concentration (or activity) at the nanomolar level is described in detail. The methodology has been validated with a synthetic solution containing Zn and nitrilotriacetic acid (NTA) and then applied, as a first case, to two coastal seawater samples taken close to Barcelona and Tarragona (Catalonia, North-Eastern Spain) finding values in the range of 1<br>3 nM, representing around 25% of total Zn. This technique can, in the near future, be crucial in helping to elucidate the role of the free zinc(II) concentration in natural waters.
Is part ofTalanta, 2007, vol. 71, num. 4, p. 1795-1803
European research projects
Showing items related by title, author, creator and subject.
A comparison between the determination of free Pb(II) by two techniques: Absence of gradients and Nernstian equilibrium stripping and resin titration Alberti, Giancarla; Biesuz, Raffaela; Huidobro Redondo, César; Companys Ferran, Encarnació; Puy Llorens, Jaume; Galceran i Nogués, Josep (Elsevier, 2007)Absence of gradients and Nernstian equilibrium stripping (AGNES) is an emerging electroanalytical technique designed to measure free metal ion concentration. The practical implementation of AGNES requires a critical selection ...
Application of the new electroanalytical technique AGNES for the determination of free Zn concentration in river water Zavarise, Francesca; Companys Ferran, Encarnació; Galceran i Nogués, Josep; Alberti, Giancarla; Profumo, Antonella (Springer Verlag, 2010)Absence of gradients and Nernstian equilibrium stripping (AGNES) is a recently developed electroanalytical technique specifically designed for the direct determination of free concentrations of metal ions. AGNES is applied ...
Huidobro Redondo, César; Companys Ferran, Encarnació; Puy Llorens, Jaume; Galceran i Nogués, Josep; Pinheiro, Jose Paulo (Elsevier, 2007)Absence of gradients and nernstian equilibrium stripping (AGNES) is a new electroanalytical technique designed to determine free heavy metal ion concentrations in solutions. AGNES had been applied, up to date, with ...