SOLUBILITY OF POLYCHLORINATED-BIPHENYLS IN WATER-ALCOHOL MIXTURES .1. EXPERIMENTAL-DATA

The solubilities of 4-monochlorobiphenyl, 2,4,6-trichlorobiphenyl, and 2,2,4,4,6,6'-hexachlorobiphenyl in mixtures of water and n-alcohols were measured using batch equilibrium techniques. The n-alcohols have carbon numbers ranging from one to eight. Measurements were made over a wide range of alcohol concentrations. The presence of methanol, ethanol, and 1-propanol enhances the aqueous solubility of the solutes, and the degree of enhancement increases with increasing hydrophobicity of both solute and alcohol. Deviations from a log-linear relationship were observed. Partially water-miscible alcohols (1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, and 1-octanol), when saturated in water, tend to exert smaller effects on the solubility of solutes as the alkyl chain of the alcohols becomes longer. Equations were obtained through regression of the experimental solubility with the volume fraction of alcohol. These equations can be used to predict the solubility of the PCB congeners in mixtures of water and alcohols.