Dissipation of sulfotep and nicotine in a greenhouse atmosphere following their use as fumigants

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Abstract
To assess the safety of current greenhouse fumigation practice, the rates of dissipation of two common fumigants, sulfotep and nicotine were measured. Air samples were taken 1, 3, 5,7 and 24 h after fumigating, and analysed by gas chromatography. Fall‐out concentrations of both fumigants over a 24‐h period were also measured. Initial atmospheric and fallout concentrations of sulfotep were considerably higher than those of nicotine. Both fumigants dissipated rapidly between the first and third hour. Threshold limit values for sulfotep and nicotine were reached after 24 h and 3.5 h respectively. Average fall‐out concentrations were 0.021 and 0.007 μg/cm respectively.

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