Interpretation of complexometric titration data: an intercomparison of methods for estimating models of trace metal complexation by natural organic ligands.
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With the common goal of more accurately and consistently quantifying ambient concentrationsof free metal ions and natural organic ligands in aquatic ecosystems, researchers from 15 laboratories that routinely analyze trace metal speciation participated in an intercomparison of statistical methods used to model their most common type of experimental dataset, the complexometric titration. All were asked to apply statistical techniques that they were familiar with to model synthetic titration data that are typical of those obtained by applying state- of-the-art electrochemical methods–anodic stripping voltammetry (ASV) and competitive ligand equilibration-adsorptive cathodic stripping voltammetry (CLE-ACSV)–to the analysis of natural waters. Herein, we compare their estimates for parameters describing the natural ligands, examine the accuracy of inferred am- bient free metal ion concentrations ([Mf]), and evaluate the influence of the various methods and assumptions used on these.....
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CitationPižeta, I.; Sander, S.G.; Hudson,, R.J.M.; Omanovi, D.; Baars, O.; Barbeau, K.A. et al (2015) Interpretation of complexometric titration data: An intercomparison of methods for estimating models of trace metal complexation by natural organic ligands. Marine Chemistry, 173, pp.3-24. DOI: https://doi.org/10.1016/j.marchem.2015.03.006
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