Chromium (Cr) is a heavy metal that is more toxic in hexavalent form (Cr(VI)) than its trivalent chromium (Cr(III). Cr(VI) is mobile, while Cr(III) is commonly viewed as immobile, forming Cr(OH)3 and CrxFe1-x(OH)3 precipitates. However, in the presence of colloidal organic carbon, the solubility of Cr(III) can increase significantly that can affect Cr transportation. While the interactions between Cr and oxidized organic carbon have often been investigated, the interactions between reduced colloidal organic carbon and Cr have not been well studied. The reduced colloidal organic carbon is common In anaerobic and reducing environment. This presentation will discuss our recent research on the redox interactions between reduced humic substances and Cr(VI), and its effect on the solubility of the reduction product Cr(III) and subsequent transport. Wet-lab experiments and microscopic/spectroscopic observations indicated that Cr(VI) can be quickly reduced by reduced humic substances, forming Cr(III) that is primarily associated with colloidal organic materials. The transport of Cr(III) was controlled by the transport of collodidal organic materials. Chromium (Cr) is a heavy metal that is more toxic in hexavalent form (Cr(VI)) than its trivalent chromium (Cr(III). Cr(VI) is mobile, while Cr(III) is commonly viewed as immobile, forming Cr(OH)3 and CrxFe1-x(OH)3 precipitates. However, in the presence of colloidal organic carbon, the solubility of Cr(III) can increase significantly that can affect Cr transportation. While the interactions between Cr and oxidized organic carbon have often been investigated, the interactions between reduced colloidal organic carbon and Cr have not been well studied. The reduced colloidal organic carbon is common In anaerobic and reducing environment. This presentation will discuss our recent research on the redox interactions between reduced humic substances and Cr(VI), and its effect on the solubility of the reduction product Cr(III) and subsequent transport. Wet-lab experiments and microscopic/spectroscopic observations indicated that Cr(VI) can be quickly reduced by reduced humic substances, forming Cr(III) that is primarily associated with colloidal organic materials. The transport of Cr(III) was controlled by the transport of collodidal organic materials.

Interaction between reduced colloidal humic substances with chromium and its effect on chromim transformation and transport

255th National Meeting (2018)

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