Application of the new electroanalytical technique AGNES for the determination of free Zn concentration in river water

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2010
Author
Zavarise, Francesca
Companys Ferran, Encarnació
Galceran i Nogués, Josep
Alberti, Giancarla
Profumo, Antonella
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Abstract
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 here to the determination of free Zn concentration in a river water sample. The
method has been validated with synthetic solutions of low ionic strengths containing Zn and 2,6-pyridinedicarboxylic acid and then applied to synthetic river waters and to a natural sample collected from Besòs River in Montcada i Reixac (Catalonia, North-Eastern Spain). In the river sample, an average free Zn concentration of 12.8(4) nM was obtained, while the total dissolved Zn concentration was 0.51(8) μM. To control and maintain pH and pCO2 constant during AGNES measurements, a novel device for N2/CO2 mixed purging has been developed.
URI
http://hdl.handle.net/10459.1/48920
DOI
https://doi.org/10.1007/s00216-009-3439-8
Is part of
Analytical and Bioanalytical Chemistry, 2010, vol. 397, num. 1, p. 389-394
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