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Dissolution of Selected Rocks and Minerals in a Dilute Salt Solution as Influenced by Temperature Regime¹

ABSTRACT

Soil environments are generally characterized by temperatures that vary diurnally and/or seasonally, but mean temperatures are often reported to describe these environments. This study was designed to monitor the dissolution of ground samples of olivine (OL), microcline (M), a sandstone (SD) and a shale (SH) in 0.01N AlCl₃ when subjected to an alternating temperature regime (mean 25°C with range 3 to 47°C) and constant temperature regimes of 3, 25, and 47°C for periods of up to 90 days. The concentration of a structural cation (Mg for OL and K for M, SD and SH) in the suspending medium was employed as an indicator of the extent of dissolution. Dissolution increased approximately linearly with increasing constant temperature in the order OL > M > SD > SH. The effect of the alternating temperature regime was to increase dissolution relative to a constant temperature of 25°C; the magnitude of the increased varied with the material. An "effective temperature" was calculated to quantify the relative effect of the alternating temperature to the constant temperature regimes. The ranking of the effective temperatures was OL > SH > SD > M. The concepts developed from this laboratory study may be related to reported observations of soil development/aspect relationships in the field where it appears that variables that describe factors such as the interaction of the nature of the parent material and the magnitude of environmental differences may need to be included.

¹ Contribution of the Agronomy Department, Ohio Agric. Res. & Development Center and Ohio State University. Approved for publication as Journal Article no. 27-28 of the Ohio Agr. Res. and Develop. Ctr. Wooster, OH 44691.

² Formerly Graduate Associate, Department of Agronomy, Ohio State Univ., presently Assistant Professor, Department of Agronomy, Pennsylvania State Univ. and Associate Professor of Agronomy, Ohio State Univ., respectively.

Received for publication March 20, 1978. Accepted for publication September 26, 1978.