Abstract
Subcooled saturation liquid-phase vapor pressures (PL) were determined for 21 chlorinated bornane and camphene congeners by capillary gas chromatography. Values of PL for congeners with 6−10 chlorine substituents at 25 °C ranged from (0.23 to 7.1) mPa, and enthalpies of vaporization (ΔvapH) ranged from (77.6 to 91.8) kJ·mol-1. Values of log PL and ΔvapH were inversely correlated to chlorine number (r2 = 0.883 and 0.854). When correlated versus molecular mass, PL values of toxaphene congeners were slightly lower than those of other nonaromatic chlorinated pesticides (hexachlorocyclohexanes, cyclodienes) but higher than PL values of aromatic chlorinated pesticides (DDT group compounds) and polychlorinated biphenyls (PCBs). The ΔvapH values of toxaphene congeners and other nonaromatic chlorinated pesticides were similar, and both groups of compounds had ΔvapH values lower than those for DDTs and PCBs. Relationships of log PL and ΔvapH to chlorine positioning followed published trends with relative retention index on a nonpolar GC column.
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