AbstractA simple gravimetric method was developed for determining the relative volatilities of non‐aqueous pesticide formulations and spray diluents, and was compared with the droplet method. The technique involved evaporation of a liquid film from a filter paper surface, and provided greater precision than the droplet method. With both methods, the percentage of mass or volume remaining at timetfollowed an exponential decay curve, and the coefficients of the equations showed a good correlation between the two methods. The rates of evaporation were consistently lower in the gravimetric method than in the droplet method, and because of this, subtle differences in the relative volatilities of different formulations could be identified by the gravimetric method but not by the droplet metho
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