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The Relationship Between Adsorption of Trace Metals, Organic Matter, and pH in Temperate Soils¹

ABSTRACT

Distribution constants for Cd and Pb were measured for 33 temperate soils. The distribution constants were related to soil organic matter and pH at three different ionic strengths of soil extractants. The soil extractants consisted of solutions of CaCl₂, NaCl, and KCl and were taken to be representative of the composition of the soil solution phases. For each ionic strength a significant log-log correlation was found between the distribution constants, related to organic matter content of the soil and the hydrogen ion concentrations of the soil extracts. Exchangeable or mobile fractions of Cd and Pb in the soil were calculated from the product of distribution constant and concentration in a soil extract. With the aid of adsorption data of previous work with other soils, assuming a similar relationship as found for Cd and Pb, comparable results were obtained for Cu and Zn. Exchangeable fractions were found to lie in a range of about 1 to 5% of total metal in the soils for Pb and about 10 to 50% for Cd, Zn, and Cu.

Key Words: copper • zinc • cadmium • lead • solubility • speciation • anodic stripping • voltammetry • pollution

¹ Contribution of the Inst. for Soil Fertility, P.O. Box 30003, Haren (Gr.), The Netherlands.

² Environmental Chemists. Current address of senior author is: CSIRO, Div. of Groundwater Res., Private Bag, P.O. Wembley, Western Australia, 6014.

Received for publication June 20, 1983.

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