Abstract
An investigation into the adsorption and desorption of polydimethylsiloxane, PCBs, cadmium nitrate, copper sulfate, nickel nitrate and zinc nitrate by river sediments was carried out using either a flow-through system or a semi-static system. The material balance in the sediment compartment could be explained by the equation, d C s/d T = K 1 C w − K 2 C s. The adsorption rate constants ( K 1), desorption rate constants ( K 2) and concentration factors ( K 1/ K 2) were calculated. For hydrophobic chemicals, the K 1's were independent of water solubility, but the K 2's were relatively related to water solubility. For both hydrophobic chemicals and heavy metals, the concentration factors per fraction organic carbon were similar to the soil sorption coefficients ( K oc), expressed on a organic carbon basis.
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