The paper describes a gravimetric method of determining the volatility (evaporation rate) of pesticides. The measuring apparatus may be set at any temperature between ∼15 and 80°C; the dry air flowing through the apparatus is regulated by valves between ‐0.2 1/h and 300 1/h. Figures available for vapour pressure reveal a mathematical relation between vapour pressure and evaporation rate. This can be used as a simple method of determining the vapour pressure of any substance at 20°C by determining the evaporation rate when the air current is flowing at 50 l/h. The effects of the temperature and the air flow rate on the evaporation rate are also analysed.
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Gückel et al. (1973) studied this question.
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