Comparison of analytical techniques for dynamic trace metal speciation in natural freshwaters.


Several techniques for speciation analysis of Cu, Zn, Cd, Pb, and Ni are used in freshwater systems and compared with respect to their performance and to the metal species detected. The analytical techniques comprise the following: (i) diffusion gradients in thin-film gels (DGT); (ii) gel integrated microelectrodes combined to voltammetric in situ profiling system (GIME-VIP); (iii) stripping chronopotentiometry (SCP); (iv) flow-through and hollow fiber permeation liquid membranes (FTPLM and HFPLM); (v) Donnan membrane technique (DMT); (vi) competitive ligand-exchange/stripping voltammetry (CLE-SV). All methods could be used both under hardwater and under softwater conditions, although in some cases problems with detection limits were encountered at the low total concentrations. The detected Cu, Cd, and Pb concentrations decreased in the order DGT > or = GIME-VIP > or = FTPLM > or = HFPLM approximately = DMT (>CLE-SV for Cd), detected Zn decreased as DGT > or = GIME-VIP and Ni as DGT > DMT, in agreement with the known dynamic features of these techniques. Techniques involving in situ measurements (GIME-VIP) or in situ exposure (DGT, DMT, and HFPLM) appear to be appropriate in avoiding artifacts which may occur during sampling and sample handling.

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@article{Sigg2006ComparisonOA, title={Comparison of analytical techniques for dynamic trace metal speciation in natural freshwaters.}, author={Laura Sigg and Frank Black and Jacques Buffle and Jun Cao and Rob F M J Cleven and William Davison and Josep Galceran and Peggy Gunkel and Erwin J J Kalis and David Kistler and Michel Martin and St{\'e}phane No{\"{e}l and Yusuf Nur and Niksa Odzak and Jaume Puy and Willem H van Riemsdijk and Erwin J. M. Temminghoff and Mary-Lou Tercier-Waeber and Stefanie Toepperwien and Raewyn M Town and Emily R Unsworth and Kent W Warnken and Liping Weng and Hanbin Xue and Hao Zhang}, journal={Environmental science & technology}, year={2006}, volume={40 6}, pages={1934-41} }