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Solubility and Redox Criteria for the Possible Forms of Selenium in Soils¹

ABSTRACT

The solubility of Se in seven soils indicate that Se concentration in solution is governed primarily by a ferric oxide-selenite-adsorption complex (Se oxidation state +4). However, under certain conditions Se may also exist in the oxidation states +6, 0, and –2. The proportions of Se in the four oxidation states are treated theoretically as they are affected by the redox potential, soil pH, and ions with which Se combines.

¹ Contribution from the US Plant, Soil & Nutrition Laboratory, Soil & Water Conservation Research Division, ARS, USDA, Ithaca, New York.

² Research Assoc., N. Y. S. College of Agriculture, Ithaca, New York; Chemist, USDA, Ithaca, New York; Principal Research Scientist, CSIRO Victoria, Australia; and Research Soil Scientist, USDA, Ithaca, New York, respectively.

Received for publication February 13, 1967. Accepted for publication September 29, 1967.