TY - JOUR
T1 - Vapor pressure of ten polychlorinated biphenyl congeners and two commercial fluids as a function of temperature
AU - Nakajoh, Katsuhiko
AU - Shibata, Etsuro
AU - Todoroki, Tomohiro
AU - Ohara, Atsushi
AU - Nishizawa, Katsushi
AU - Nakamura, Takashi
PY - 2005/7
Y1 - 2005/7
N2 - The Knudsen mass-loss effusion technique was used to measure the vapor pressures of commercial Kanechlor fluids (Kanechlor 300 and Kanechlor 500) and 10 major individual polychlorinated biphenyls (PCBs) in Kanechlors as a function of temperature and ortho-chlorine substitution. From the temperature dependence of vapor pressure, the thermodynamic parameters, such as enthalpies and entropies of sublimation and vaporization, were derived using the Clausius-Clapeyron equation. The results were compared with both experimental and calculated literature values. The ortho-chlorine substitution effects on the vapor pressure of major PCB congeners in Kanechlor mixtures were studied on the same homologous series. Within this series, the greater the number of chlorine substitutions in the ortho-positions, the higher the vapor pressure, because of the ortho-effect.
AB - The Knudsen mass-loss effusion technique was used to measure the vapor pressures of commercial Kanechlor fluids (Kanechlor 300 and Kanechlor 500) and 10 major individual polychlorinated biphenyls (PCBs) in Kanechlors as a function of temperature and ortho-chlorine substitution. From the temperature dependence of vapor pressure, the thermodynamic parameters, such as enthalpies and entropies of sublimation and vaporization, were derived using the Clausius-Clapeyron equation. The results were compared with both experimental and calculated literature values. The ortho-chlorine substitution effects on the vapor pressure of major PCB congeners in Kanechlor mixtures were studied on the same homologous series. Within this series, the greater the number of chlorine substitutions in the ortho-positions, the higher the vapor pressure, because of the ortho-effect.
KW - Commercial Kanechlor fluids
KW - Ortho-effect
KW - Polychlorinated biphenyls
KW - Thermodynamic parameters
KW - Vapor pressure
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U2 - 10.1897/04-381R.1
DO - 10.1897/04-381R.1
M3 - Article
C2 - 16050575
AN - SCOPUS:21444449408
VL - 24
SP - 1602
EP - 1608
JO - Environmental Toxicology and Chemistry
JF - Environmental Toxicology and Chemistry
SN - 0730-7268
IS - 7
ER -