Apparent solubility of organochlorine insecticides in water at various temperatures

Abstract

In this study, the behavior of organochloride pesticides in water were investigated in order to determine the interrelation between solubility (or lack of it) and various adsorption desorption reactions that occur during the movement and mixing of waters in streams and soils. Such information would also help researchers to assess solubility effects on biological activity and degradation of the material, since solubility, organism response, and degradation or leaching may be significant factors in the disappearance of many of these materials from soil and water. In studying the energetics of adsorption desorption reactions in soils, the effect of temperature on the concentration should be known to calculate certain thermodynamic quantities. Such a need therefore prompted an investigation of the temperature solubility interaction for the range of temperature encountered in the adsorption desorption experiments. In this study, much effort was expended to dissolve or disperse the compounds in such a way as to form individual molecular species. This involved dispersion by shaking, ultrasonic treatment, filtering, and centrifuging at different velocities.