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ABSTRACT
The competitive adsorption of Cd, Cu, Pb, and Zn from 0.025 M NaClO4 solutions onto four soils with differing chemical properties was investigated with batch adsorption experiments. For two mineral soils, adsorption under acidic conditions (pH 5.0) followed the sequence Pb > Cu > Zn > Cd, which corresponds to the order of increasing pK for the first hydrolysis product (e.g., PhOH+) of the metal ions. In contrast, the order of selectivity for two soils containing 20 to 40 g kg–1 organic C was Pb > Cu > Cd > Zn, suggesting that organic matter (OM) increased Cd retention preferentially over that of Zn. When accompanied by a sizable reduction in cation exchange capacity (CEC), extraction of soil OM markedly reduced adsorption of all four metals. However, only Cd and Cu adsorption were appreciably smaller for a soil that maintained a sizable CEC following OM removal. Lead, and possibly Zn, adsorption by soils with substantial inorganic exchange sites may be unresponsive to organic waste amendments. For Cd and Cu, increased soil OM should restrict mobility and bioavailability, at least under acidic conditions where soluble metal complex formation is limited.
Key Words: Cd • Cu • Pb • Zn • selectivity sequence • organic C
1 The work was part of Regional Research Project NE-96: Soil Properties Affecting Sorption of Heavy Metals from Wastes; additional support was provided by National Science Foundation grant no. CEE 8104728. Published with approval of the Director, Pennsylvania Agric. Exp. Stn. as journal series no. 7406.
2 Associate professor, Agricultural Engineering Dep., Pennsylvania State Univ., University Park, PA 16802; former Graduate Student (now Project Manager, Environmental Resources Management, Inc., West Chester, PA 19382); and Professor, Civil Engineering Dep., Univ. of Delaware, Newark, DE 19716.
Received for publication August 12, 1985.
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