Determination of physicochemical properties of tetrabromobisphenol A.
Aqueous solubility (Sw), 1-octanol/water partition coefficient (Kow), and vapor pressure of the nonionic form of 2,2',6,6'-tetrabromo-4,4'-isopropylidenediphenol (tetrabromobisphenol A or TBBP-A) were measured. From this, enthalpies of solution and vaporization were estimated. Furthermore, enthalpy of fusion and melting point were measured to estimate subcooled liquid vapor pressure, the infinite dilution activity coefficient, and Henry's law constant. Since TBBP-A is expected to exit in both ionic and nonionic forms at near neutral pH, pH effects on physicochemical properties were also examined. Because of the ionization of TBBP-A, Sw increased by five orders of magnitude, while Kow decreased by eight orders of magnitude. Furthermore, an analytical model based on mass balance and dissociation of TBBP-A was applied to represent the pH dependence.
Kuramochi
Hidetoshi
H
Research Center for Material Cycles and Waste Management, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan. kuramochi.hidetoshi@nies.go.jp
Kawamoto
Katsuya
K
Miyazaki
Kohei
K
Nagahama
Kunio
K
Maeda
Kouji
K
Li
Xian-Wei
XW
Shibata
Etsuro
E
Nakamura
Takashi
T
Sakai
Shin-ichi
S
D006863:Hydrogen-Ion Concentration; D011075:Polybrominated Biphenyls / Q000737:chemistry*; D012995:Solubility; D014867:Water
D011075:Polybrominated Biphenyls; D014867:Water; C020806:tetrabromobisphenol A