Abstract
The contents of dissolved rhodium species in the near-neutral environments have been studied for the first time and data on the interaction of Rh with organic matters of natural waters and its sorption behavior during contact with the components of geochemical barriers were obtained. The solubility method was used to analyze the behavior of rhodium hydroxide in the Rh(OH) x –H2O and Rh(OH) x –H2O–FA (fulvic acids) systems. The possible contents of inorganic species of rhodium and its compounds with humic organic ligands were determined within the pH range typical of surface waters. The solubility of rhodium shows a twoorder- of magnitude increase in the presence of humic matters (FA). The sorption interaction of the soluble rhodium species with the main components of geochemical barriers such as iron oxyhydroxides (III), (including fulvic-acid modified ones), alumosilicates, and precipitates of humic acids in contact with natural waters was studied. It was revealed that rhodium has the high affinity to all studied materials; its species are sorbed by ferrihydrite within several hours. It is suggested that rhodium is mainly transferred as colloid with suspended particulate matters of waters and then is accumulated in bottom sediments. The differences revealed in the sorption behavior of Pt(IV), Pd(II) and Rh(III) may be used to predict the distribution of the considered platinum group elements between the components of ecosystems.
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Original Russian Text © I.Ya. Koshcheeva, I.V. Kubrakova, N.V. Korsakova, O.A. Tyutyunnik, 2016, published in Geokhimiya, 2016, No. 7, pp. 641–650.
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Koshcheeva, I.Y., Kubrakova, I.V., Korsakova, N.V. et al. Solubility and migration ability of rhodium in natural conditions: model experimental data. Geochem. Int. 54, 624–632 (2016). https://doi.org/10.1134/S0016702916050049
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DOI: https://doi.org/10.1134/S0016702916050049