Henry's law constants of polychlorinated biphenyl congeners and their variation with temperature

被引：104

作者：

Bamford, HA

Poster, DL

Baker, JE

机构：

[1] Univ Maryland, Ctr Environm Sci, Chesapeake Biol Lab, Solomons, MD 20688 USA

[2] NIST, Div Analyt Chem, Chem Sci & Technol Lab, Gaithersburg, MD 20899 USA

来源：

JOURNAL OF CHEMICAL AND ENGINEERING DATA | 2000年 / 45卷 / 06期

关键词：

D O I：

10.1021/je0000266

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The Henry's law constants for 26 polychlorinated biphenyl (PCB) congeners were measured using a gas-stripping apparatus at five environmentally relevant temperatures between (4 and 31) degreesC. The Henry's law constants ranged between (0.079 +/- 0.003) Pa.m(3).mol(-1) for 2,2',3,3',4,4',5,6-octachlorobiphenyl (IUPAC congener #195) at 4 degreesC and (308 +/- 29) Pa.m(3)mol(-1) for 2,2',3,3',4,5',6,6'-octachlorobiphenyl (IUPAC congener #201) at 31 degreesC. The temperature dependence of each PCB congener's Henry's law constant was modeled to calculate the enthalpy and entropy of the phase change between the gaseous and dissolved phases. For many PCB congeners, this study reports the first experimentally measured temperature variations of their Henry's law constants. The enthalpies of phase change (DeltaH(H)) ranged between (14.5 +/- 3.4) kJ.mol(-l) for 2,2',4,6,6'-pentachlorabiphenyl (IUPAC congener #104) and (167 +/- 13) kJ.mol(-l) for 2,2',3,3',4,4',5,6-octachlorobiphenyl (IUPAC congener #195). These data can be used to predict PCB congener Henry's law values within the experimental temperature range within a relative standard error of less than 10%.

引用

页码：1069 / 1074

页数：6