Vapor pressures of six brominated diphenyl ether congeners

Subcooled liquid vapor pressures ( P   o Lof six polybrominateddiphenyl ether (PBDE) congeners containing three to seven bromine atoms were determined using the gas chromatograph retention time technique. Values ranged from 2.3 × 10 −7 to 1.45 × 10 −4 Pa at 25°C. An increase in the number of bromine atoms tended to decrease P   o Laccording to the correlation log P   o L= −0.692 (bromine number) −1.76 ( R 2 = 0.953, p < 0.001). In addition, the first such data for individual PBDE congeners demonstrates that P   o Lwould vary four orders of magnitude over environmentally relevant temperatures.