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Determination of Gaseous Selenium-75 Evolved from Soil

Department of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521

*Corresponding author.

ABSTRACT

A rapid, cost-effective and inexpensive method was developed to determine volatile microbial metabolites of Se. Labeled inorganic Se was applied to soil, and the gaseous products were captured in a specially designed activated C trap. After removal for sampling, the C trap was counted directly for ⁷⁵Se, without further sample preparation. Maximum sampling intervals were 101 to 263 h, depending on Se emission rates. The limit of quantification was 8.2 ng Se using a specific activity of 5 Ci kg^–1 Se. The relative standard deviation ranged from 1.3 to 4.1%. Recovery for the added label was 97.5%. The technique is well suited for large-scale environmental kinetic investigations.

Contribution from the Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA.

Received for publication September 1, 1987.

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