Abstract
In the course of developing techniques for studying the adsorption and movement in soil of extremely dilute aqueous p,p'-DDT suspensions, it was essential to determine the solubility or concentration of p,p'-DDT in water under identical experimental conditions to those experienced in adsorption and movement studies. Furthermore, it seemed desirable to determine whether the concentration of DDT in a stable suspension if not a true solution could be predicted by thermodynamic considerations for a set of conditions different from those examined experimentally. The literature contains several values for the solubility of DDT obtained by a variety of analytical techniqueS. Richards and Cutkomp (8) reported a range of 0.2 to i~ ppb at 15~C determined by bio-assay with mosquito larvae while Roeder and Weiant (I0) estimated i0 to i00 ppb at room temperature as determined by nerve reactions in cockroaches. Babers (2) and Bowman et al., (3) reported values of 37~ ppb and not more than 1.2 ppb at 25~ respectively, determined by radiometric analysis. Gauvadan and Poussel (67 estimated a solubility of I00 ppb at 18~ by a
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