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A Modified Ion-Exchange Technique for the Determination of Stability Constants of Metal-Soil Organic Matter Complexes¹

ABSTRACT

Calculation methods based on Schubert's ion-exchange equilibrium method were developed for determining stability constants of metal-soil organic matter complexes. The methods, which were free of certain assumptions and errors inherent in the ion-exchange technique as applied previously to soil organic matter, were verified using Mn(II)-citrate and Mn(II)-oxalate systems. Apparent stability constants (log K) of Zn (II)-humic acid complexes ranged from 3.13 to 5.13 at pH 6.5.

¹ Contribution from the Dep. of Agronomy, Univ. of Illinois, Urbana. Supported in part by Grant D01-UI-00080 from the Solid Waste Program, PHS and the Metropolitan Sanitary Dist. of Greater Chicago. Also supported by funds from the Illinois Agr. Exp. Station.

² Research Assistant and Professor of Soil Chemistry, respectively. Present address of senior author: Dep. of Soils & Plant Nutrition, Univ. of California, Berkeley, Calif. 94720.

Received for publication July 23, 1971. Accepted for publication July 26, 1972.