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Complexing of Metals by Soil Organic Matter¹

ABSTRACT

Soil organic matter forms complexes with metals by ionexchange, surface adsorption, chelation, and complex coagulation and peptization reactions. Little is known concerning the nature of the ligands in polymeric components of soil organic matter which chelate metals, but carboxyl, hydroxy, and amide groups are probably involved. A number of low molecular weight compounds capable of chelating metals have been isolated from soils.

Metallo-organic matter complexes must be identified and characterized before unequivocal evidence for their formation in soils can be obtained.

¹ Journal paper No. 15–62 of the Ohio Agr. Exp. Sta., published with permission of the Director, under U. S. Atomic Energy Comm. Project AT(11-1)-414. Presented before Div. III, Soil Science Society of America, Nov. 28, 1961, at St. Louis, Mo.

² Professor, Ohio Agr. Exp. Sta. and The Ohio State University.

Received for publication April 24, 1962. Accepted for publication July 16, 1962.