2026-04-14T07:15:57Zhttps://recercat.cat/oai/request

oai:recercat.cat:10459.1/489202024-12-05T22:45:58Zcom_2072_3622col_2072_479130

00925njm 22002777a 4500 dc Zavarise, Francesca author Companys Ferran, Encarnació author Galceran i Nogués, Josep author Alberti, Giancarla author Profumo, Antonella author 2015-11-06T08:52:31Z 2015-11-06T08:52:31Z 2010 2015-11-06T08:52:31Z 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. http://hdl.handle.net/10459.1/48920 Zinc Aigua dolça Anàlisi electroquímica Zinc Fresh water Electrochemical analysis Application of the new electroanalytical technique AGNES for the determination of free Zn concentration in river water