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The Effect of Exchangeable Cations on Soil Mineral Weathering¹

ABSTRACT

The kinetics of dissolution of soil minerals as a function of the ionic composition of the exchange phase were studied using a calcareous soil and a noncalcareous soil. It was concluded that mineral dissolution occurred as a two-step reaction when an exchanger phase is present. The initial fast reaction was completed in < 1 h and was linearly related to the amount of exchangeable sodium. The second slower reaction was independent of the exchangeable cation but dependent on the total mineral surface (soil-to-water ratio) available for weathering. The kinetics of dissolution for the second reaction was diffusion controlled.

¹ Contribution from the Dep. of Soil Science and Biometeorology, Utah State Univ., Logan, UT 84322.

² Visiting Professor of Soil Chemistry, Research Assistant, and Professor of Soil Chemistry, respectively, Dep. of Soil Science and Biometeorology, Utah State University, Logan, UT 84322.

Received for publication September 3, 1982. Accepted for publication February 14, 1983.