A simple method to determine relative volatilities of aqueous formulations of pesticides

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Abstract
A simple gravimetric method was developed to determine relative volatilities of aqueous formulations of pesticides. The technique involved evaporation of a liquid film from a plastic mesh surface. The suitability of the method for volatility determinations was tested against liquids of known boiling points, and adjuvant solutions of different concentrations. During the initial stage of evaporation, the percentage of weight remaining at time ''t'' followed a nearly linear decrease with most formulations. At the second stage, however, a curvilinear decrease was noted, followed by an asymptotic limit at the final stage. Regression analysis of the data obtained during the first two stages of evaporation indicated that the method is sensitive enough to identify small differences in the evaporation rates of aqueous formulations of pesticides.

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