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A simple gravimetric method was developed to determine volatilities of spray mixtures and was compared with the droplet method. The method involved evaporation of a liquid film from a filter paper surface and provided greater precision than the droplet method. It also provided a greater sensitivity in identifying small differences in the volatilities of different spray mixtures. An indirect method was also investigated to provide an understanding of the volatilities of spray mixtures from their viscosities and viscosity-temperature relationships. The data indicated an inverse relationship between the viscosity of a spray mixture and its volatility. With respect to the viscosity-temperature relationships, most spray mixtures obeyed the Arrhenius equation for the viscous flow. The exponential relationship of viscosity with the reciprocal of temperature provided a good correlation. The intercept of the equation was directly related to volatility, and the slope was inversely related to volatility.
viscosity, volatility, evaporation rate, pesticide formulations, spray mixtures, diluent oils
Research Scientist, Agriculture Canada, Forestry Service, Forest Pest Management Institute, Ontario,