Determination of free Zn2+ concentration in synthetic and natural samples with AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) and DMT (Donnan Membrane Technique)

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Issue date
2012-04-01
Author
Chito Trujillo, Diana Maria
Weng, Liping
Galceran i Nogués, Josep
Companys Ferran, Encarnació
Puy Llorens, Jaume
Riemsdijk, Willem H. van
Leeuwen, Herman P. van
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Abstract
The determination of free Zn2+ ion concentration is a key in the study of environmental systems like river water and soils, due to its impact on bioavailability and toxicity. AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) and DMT (Donnan Membrane Technique) are emerging techniques
suited for the determination of free heavy metal concentrations, especially in the case of Zn2+, given that there is no commercial Ion Selective Electrode. In this work, both techniques have been applied to synthetic samples (containing Zn and NTA) and natural samples (Rhine river water and soils), showing good agreement. pH fluctuations in DMT and N2/CO2 purging system used in AGNES did not affect considerably the measurements done in Rhine river water and soil samples. Results of DMT in situ of Rhine river water are comparable to those of AGNES in the lab. The comparison of this work provides a cross-validation for both techniques.
URI
http://hdl.handle.net/10459.1/48922
DOI
https://doi.org/10.1016/j.scitotenv.2012.01.052
Is part of
Science of the Total Environment, 2012, vol. 421-422, num. April, p. 238-244
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