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- W2012851787 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 (Mz+) 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 Co2+, Cd2+, and rare earth elements (REE3+). 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 REE3+ were similar in the presence of HS, while they were different in the absence of HS due to the different size of each REE3+. The similarity among the diffusion coefficients of REE-HS was caused by the much larger size of HS compared with each ion. However, the distribution coefficients of M-HS were not similar among REE3+, Cd2+, and Co2+. REE3+ and Cd2+ which have higher affinities for larger MW fraction in HS diffused slower than Co2+ which favors smaller MW fraction. The results show that the affinity for different MW fractions among HS controls the diffusion of M-HS, which must be important to predict precisely the diffusion behavior of metal ions bound to HS in natural systems." @default.
- W2012851787 created "2016-06-24" @default.
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- W2012851787 date "2008-11-01" @default.
- W2012851787 modified "2023-09-25" @default.
- W2012851787 title "Effect of complexation with humic substances on diffusion of metal ions in water" @default.
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- W2012851787 doi "https://doi.org/10.1016/j.chemosphere.2008.07.017" @default.
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