Relationships between Cd and Zn partitioning and geochemical composition in sediments from Chinese rivers
- Peng, SH
- Wang, WX
- Chen, JS
DOIAbstract
Adsorption isotherm experiments were conducted to determine the distribution coefficients (K-d) for Cd and Zn between water and sediments from twelve rivers in eastern China. The low metal concentration (<10(-10) M) added into the sediment-water system enabled the direct measurements of linear adsorption isotherms. When other solution parameters, such as ionic strength, were controlled, sediment geochemical characteristics were the major factors affecting metal distribution. The K-d was highly dependent on the total organic carbon contents and Fe-Mn oxide at pH = 7.0, and was affected significantly by the carbonate content in the sediments due to its control of pH. The Kd of the Huanghe sediments, which had the highest carbonate concentrati...
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