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The (Fe)(OH)³ Ion Product in Suspensions of Acid Soils¹

ABSTRACT

In suspensions of seven acid soils, the (Fe)(OH)³ ion product was constant after 139 days at a mean value of 1 (± 0.5) x 10_–39. Varying the soil/suspension ratio from 1:10 to 1:1,000, as well as changing the concentration of calcium chloride from 0.01 to 0. 1M had no significant effect upon the (Fe) (OH)³ ion product. This ion product agrees well with recently reported solubility products of amorphous iron (III) hydroxide.

Key Words: iron (III) hydroxide

¹ Contribution of the Department of Soils and Plant Nutrition University of California, Riverside, California. Presented before Div. S-2 of the Soil Science Society of America, Kansas City, Mo., Nov. 1964.

² Postdoctoral Fellow, UCR; presently Associate Professor, Department of Agricultural Chemistry and Soils, University of Arizona, Tuczon, Ariz.

Received for publication March 27, 1967. Accepted for publication May 23, 1967.