Abstract
Many pesticides are susceptible to volatilization, which may result in decreased pest control and off-site deposition that may cause adverse environmental impacts. Prediction of such losses requires knowledge of pesticide partition coefficients, including Henry's constant (Hc); however accurate data are lacking. In this experiment, the batch air stripping technique was used to determine Hc for EPTC (S-ethyl N,N-di-n-propylthiocarbamate). At 25 °C, measured Hc in pure water was 0.0107, 11 times greater than indirectly estimated values reported in the literature. The measured heat of volatilization for EPTC, used to describe the temperature dependence of Hc, was 37.12 kJ mol-1. Hc measured with soil extract was 7 times greater than that measured in pure water, presumably due to effects of dissolved salts and organic acids. Keywords: EPTC; Henry's law constant; volatilization; soil solution
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