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Species kinetics and heterogeneous reactivity of dissolved Cu in natural freshwaters

Species kinetics and heterogeneous reactivity of dissolved Cu in natural freshwaters
Species kinetics and heterogeneous reactivity of dissolved Cu in natural freshwaters
Using high specific activity 64Cu2+ as radiotracer, the distribution kinetics among Cu species were established in natural organic-rich freshwaters under steady-state conditions, i.e., with minimal disturbance of existing equilibria. Study sites with contrasting suspended particulate matter (SPM) characteristics were investigated. Our analytical protocol allowed the differentiation between the following Cu species: SPM associated Cu, dissolved reactive (free and labile) Cu, and organically complexed Cu. The data obtained were successfully evaluated by compartmental analysis, which showed the importance of organically complexed Cu in freshwaters, and the dominant role of the interactions between organically complexed Cu and SPM in a SPM-rich water. The kinetic 64Cu measurements indicated that the attainment of equilibrium between dissolved reactive and organically complexed Cu took ca. <1-2 h, and 4-15 h for the interaction between dissolved organically complexed and SPM associated Cu. The kinetic study was augmented by voltammetric measurements of the dissolved (stable) Cu equilibrium speciation conditions in the natural waters. These measurements showed that the waters contained very low cupric ion concentrations (10-12-10-15 M), with more than 99.9% of the dissolved Cu complexed by strong organic ligands (conditional stability constants: 1013.4-1015.4).
0013-936X
914-920
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
van Elteren, Johannes T.
36987043-dd7c-4356-ada3-60c078931e71
Kolar, Zvonimir I.
5734dd4a-b33c-48d9-896a-77e7a6593191
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
van Elteren, Johannes T.
36987043-dd7c-4356-ada3-60c078931e71
Kolar, Zvonimir I.
5734dd4a-b33c-48d9-896a-77e7a6593191

Achterberg, Eric P., van Elteren, Johannes T. and Kolar, Zvonimir I. (2002) Species kinetics and heterogeneous reactivity of dissolved Cu in natural freshwaters. Environmental Science & Technology, 36 (5), 914-920. (doi:10.1021/es010109m).

Record type: Article

Abstract

Using high specific activity 64Cu2+ as radiotracer, the distribution kinetics among Cu species were established in natural organic-rich freshwaters under steady-state conditions, i.e., with minimal disturbance of existing equilibria. Study sites with contrasting suspended particulate matter (SPM) characteristics were investigated. Our analytical protocol allowed the differentiation between the following Cu species: SPM associated Cu, dissolved reactive (free and labile) Cu, and organically complexed Cu. The data obtained were successfully evaluated by compartmental analysis, which showed the importance of organically complexed Cu in freshwaters, and the dominant role of the interactions between organically complexed Cu and SPM in a SPM-rich water. The kinetic 64Cu measurements indicated that the attainment of equilibrium between dissolved reactive and organically complexed Cu took ca. <1-2 h, and 4-15 h for the interaction between dissolved organically complexed and SPM associated Cu. The kinetic study was augmented by voltammetric measurements of the dissolved (stable) Cu equilibrium speciation conditions in the natural waters. These measurements showed that the waters contained very low cupric ion concentrations (10-12-10-15 M), with more than 99.9% of the dissolved Cu complexed by strong organic ligands (conditional stability constants: 1013.4-1015.4).

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Published date: 1 March 2002

Identifiers

Local EPrints ID: 12545
URI: http://eprints.soton.ac.uk/id/eprint/12545
ISSN: 0013-936X
PURE UUID: 5bd1459a-6e59-4c78-95f4-dc4f9d3c7337

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Date deposited: 26 Nov 2004
Last modified: 06 Nov 2019 17:31

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