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Kinetics of Salt Release from a Saline Soil¹

ABSTRACT

The kinetics of salt release from simulated saline sediments was studied to ascertain the potential of sediments as a diffuse source of salinity. Two rate equations were derived, both based on the premise that dissolution was a diffusion controlled process. The equations were ln (1 – C/C_s) = -kt and C = k't^1/2, where c is the concentration at any point in the bulk solution, c_s is the equilibrium concentration of the soluble soil minerals, t is time, k is the first-order rate constant, and k' a proportionality constant. Kinetic data were obtained from a saline typic torriorthent soil derived from Mancos shale in the Price river Basin, Utah. During the initial 72 hours of reaction, dissolution can be described by three, diffusion controlled, reactions. Increasing particle size decreased the rate of reaction. Both derived equations were equally effective in describing salt release.

¹ Contribution from the Dep. of Soil Science and Biometeorology, Utah State Univ., Logan, UT 84322. This work was supported in part through USDI/BLM contract no. 52500-CT5-16. Published with approval of the Director, Utah Agric. Exp. Stn as J. Pap. 2186.

² Professor of Soil Chemistry, former Graduate Assistant now Soil Scientist, SCS, Provo, UT 84601, and Assistant Professor of Soil Science, respectively.

Received for publication November 1, 1976. Accepted for publication April 13, 1977.

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