Abstract
Dimethylselenide, dimethyldiselenide and diethylselenide are sampled from air by cryogenic trapping and determined by gas chromatography with electrothermal atomicabsorption spectrometric detection. Important considerations in the optimization of sensitivity and selectivity of this approach are discussed. Molecular absorption at the selenium atomic absorption wavelength is reduced by the addition of 10% hydrogen to the argon flow in the graphite oven. Detection limits down to 0.2 ng m -3 allow the ready detection of the methyl compounds in rural air with a precision of about 10% at the nanogram level.
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