Effect of complexation with humic substances on diffusion of metal ions in water

Chemosphere
Kenji Furukawa, Yoshio Takahashi

Abstract

Most studies on diffusion of metal ions in various water-rock systems have dealt with free ions (hydrated ions). However, it is often the case that metal ions are dissolved as complexed species such as with humic substances (HS) in natural waters. Hence, we need to study the diffusion behavior of these complexes in order to understand fully the diffusion phenomenon in natural. In this study, the diffusion coefficients of free metal ions (M(z+)) and their complexes with HS (M-HS) were compared to understand the effect of complexation with HS on the diffusion of metal ions such as Co(2+), Cd(2+), and rare earth elements (REE(3+)). Although the diffusion coefficients of free metal ions depend on ionic potential, such dependence was not observed in the presence of HS. Comparing the diffusion coefficients of metal complexes with ethylenediaminetetraacetate (EDTA), fulvic acid, and humic acid showed that the molecular weight (MW), or the size of the ligand, is of primary importance for the diffusion of M-HS. As a consequence, the diffusion coefficients of all REE(3+) were similar in the presence of HS, while they were different in the absence of HS due to the different size of each REE(3+). The similarity among the diffusion coeffici...Continue Reading

References

Apr 6, 2001·Journal of Contaminant Hydrology·Y TachiM Yui
Jul 30, 2002·Environmental Science & Technology·H GeckeisH P Beck
Apr 28, 2004·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Xiangke WangYican Wu
Mar 3, 2007·Analytical and Bioanalytical Chemistry·Parthasarathi ChakrabortyChuni L Chakrabarti

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Citations

Jun 1, 2013·Environmental Science. Processes & Impacts·Emmanuelle UherCatherine Gourlay-France
Jun 12, 2013·Journal of Environmental Management·N ChahinianM G Tournoud
Jul 25, 2018·Journal of Environmental Sciences (China)·Hongcheng BaiShiqiang Wei

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