Crucial role of the detection window in metal ion speciation analysis in aquatic systems: the interplay of thermodynamic and kinetic factors as exemplified by nickel and cobalt

The complexation parameters (complexation capacity, C ̃ c , and conditional stability constant, K̃) for binding of Ni(II) and Co(II) by natural organic matter (NOM) are shown to be dependent on the analytical detection window used for their determination. This observation is a consequence of ligand...

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Bibliographic Details
Published inAnalytica chimica acta Vol. 466; no. 2; pp. 285 - 293
Main Authors Town, Raewyn M., Filella, Montserrat
Format Journal Article
LanguageEnglish
Published Elsevier B.V 27.08.2002
Subjects
Analytical detection window
Cobalt
Humic substances
Natural organic matter
Natural waters
Nickel
Speciation
Natural waters
Nickel
Analytical detection window
Cobalt
Humic substances
Natural organic matter
Speciation
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Summary:The complexation parameters (complexation capacity, C ̃ c , and conditional stability constant, K̃) for binding of Ni(II) and Co(II) by natural organic matter (NOM) are shown to be dependent on the analytical detection window used for their determination. This observation is a consequence of ligand heterogeneity. Complexation parameters for isolated NOM components (humic substances and biota) are typically determined at low detection windows (weak, labile binding sites detected), whereas whole waters are generally studied at much higher detection windows (stronger, less labile sites detected). Comparison and interpretation of metal ion binding across systems and across metals is only valid if all the data were obtained within the same detection window.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(02)00570-6