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Self-Diffusion of Selenate and Selenite in Overburden

Cenex/Land O'Lakes, P.O. Box 64089, St. Paul, MN 55164;

L. R. Hossner

Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843.

^* Corresponding author.

ABSTRACT

Self-diffusion coefficients (D) for selenate (SeO^2–₄) and selenite (HSeO^–₃) were evaluated as a function of overburden pH (2, 3, 5, 7, 9) and volumetric water content (^v = 0.22, 0.28, 0.34). Selenate self-diffusion coefficients were least (D = 0.23 x 10^–6 cm² s^–1 in overburden adjusted to pH 3 and ^v = 0.22 and greatest (D = 1.8 x 10^–6 cm² s^–1 and 1.7 x 10^–6 cm² s^–1) in overburden adjusted to pH 9 and ^v = 0.28 and 0.34. Self-diffusion coefficients for HSeO^–₃ were 2 to 3 orders of magnitude slower than for SeO^2–₄. The most rapid HSeO^–₃ diffusion was observed at pH 2 and ^v = 0.34 (D = 53.2 x 10^–9 cm² s^–1). The slowest was at pH 3 and ^v = 0.22 (D = 0.2 x 10^–9 cm² s^–1). For both SeO^2–₄ and HSeO^–₃ the self-diffusion coefficients increased with increasing water content and were related to adsorption characteristics of the soil and the Se species present at each soil pH.

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