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Ammonium Sorption and Release from Rocks and Minerals¹

ABSTRACT

Some igneous rocks and primary silicate minerals were found to retain added NH₄⁺ against extraction with 1.0N KCl. The amounts ranged from 15 to 244 ppm., and were 3 to 15 times the quantity of NH₄⁺ in the original rock or mineral. At least two types of reactions were involved, namely, sorption at particle surface and intraparticle penetration. In contrast to the NH₄⁺ held in difficultly exchangeable forms by soils and secondary silicate (clay) minerals, part of the nonexchangeable NH₄⁺ in rocks and primary silicate minerals was released readily with hot 1.0N KOH. The micas were primarily responsible for NH₄⁺ fixation by igneous rocks.

¹ Contribution from the Dept. of Agronomy, Univ. of Illinois, Urbana. This investigation was supported in part by a grant from the National Science Foundation. Presented before Div. S-2, Soil Science Society of America, Nov. 30, 1961 at St. Louis, Mo.

² Graduate Assistant in Agronomy and Professor of Soil Chemistry, respectively. The senior author is now Assistant Professor of Soil Science, Univ. of Minnesota, St. Paul.

Received for publication October 21, 1963. Accepted for publication December 21, 1963.