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This article in SSSAJ

  1. Vol. 52 No. 4, p. 954-958
     
    Received: Aug 27, 1987
    Published: July, 1988


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doi:10.2136/sssaj1988.03615995005200040010x

Anion Sorption on a Calcareous, Montmorillonitic Soil-Selenium

  1. Sabine Goldberg  and
  2. R. A. Glaubig
  1. U.S. Salinity Lab., USDA-ARS, 4500 Glenwood Dr., Riverside, CA 92501
    Forest Fire Lab., USDA-FS, 4955 Canyon Crest Dr., Riverside, CA 92507

Abstract

Abstract

Selenite and selenate sorption on a calcareous, montmorillonitic soil was investigated as a function of solution pH (2–11) at two initial Se concentrations (1.9 mmol m−3 and 19 mmol m−3. Selenate sorption was not observed at any pH value for either initial Se concentration. Selenite sorption exhibited a maximum near pH 3, a sharp decline to pH 6, and a sorption plateau above pH 7. Selenite sorption as a function of pH was studied on reference minerals representative of the dominant mineral constituents of the soil: montmorillonite, kaolinite, and calcite. Selenite sorption on the clay minerals increased at low pH, exhibited a peak near pH 5, and decreased at higher pH. Selenite sorption on calcite increased from pH 6 to 8, peaked between pH 8 and 9, and decreased above pH 9. The constant capacitance model was able to describe selenite sorption on montmorillonite and kaolinite over the entire pH range studied and on the soil below pH 7. The soil sorption plateau above pH 7 virtually disappeared after removal of calcite, indicating that calcite plays an important role in selenite sorption of calcareous soils.

Contribution from the U.S. Salinity Lab.

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