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Selenate and Selenite Mobility in Overburden by Saturated Flow¹

ABSTRACT

The elution and sorption characteristics of selenate and selenite were measured in column studies. A composite of sandy loam textured strip-mine overburden was adjusted to pH 2, 3, 5, 7, and 9 and packed into glass columns. Selenium was added to the surface as the Na salt of selenate (SeO^2–₄) or selenite (SeO^2–₃). Individual columns were leached with 1.5, 10, or 50 pore volumes of 0.01 M CaCl₂. Selenate was mobile at all pH values and was completely leached from columns with <3 pore volumes of solution. Selenite was rapidly sorbed at all pH values. Very slight selenite movement was observed when high pH overburden was leached with 50 pore volumes of solution. The least movement was recorded when pH values were <7.

Key Words: Se • leaching columns • strip-mine overburden

¹ Contribution from the Dep. of Soil and Crop Sciences and the Texas Agric. Exp. Stn., Texas A&M Univ., College Station, TX 77843. This research was supported by the Center for Energy and Mineral Resources, Texas A&M Univ., College Station, TX 77843.

² Former Graduate Student and Professor, Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843. Present address of senior author is Research Scientist, ChemLawn Services Corp., P.O. Box 85-816, Columbus, OH 43085.

Received for publication February 14, 1986.