title: Determination and prediction of octanol-air partition coefficients of hydroxylated and methoxylated polybrominated diphenyl ethers.
abstract: The octanol-air partition coefficient (K(OA)) of 19 hydroxylated polybrominated diphenyl ethers (OH-PBDEs) and 10 methoxylated polybrominated diphenyl ethers (MeO-PBDEs) were measured as a function of temperature using a gas chromatographic retention time technique. At room temperature (298.15K), log K(OA) ranged from 8.30 for monobrominated OH/MeO-PBDEs to 13.29 for hexabrominated OH/MeO-PBDEs. The internal energies of phase change from octanol to air (Delta(OA)U) for 29 OH/MeO-PBDE congeners ranged from 72 to 126 kJ mol(-1). Using partial least-squares (PLS) analysis, a statistically quantitative structure-property relationship (QSPR) model for logK(OA) of OH/MeO-PBDE congeners was developed based on the 16 fundamental quantum chemical descriptors computed by PM3 Hamiltonian, for which the Q(cum)(2) was about 0.937. The molecular weight (Mw) and energy of the lowest unoccupied molecular orbital (E(LUMO)) were found to be main factors governing the log K(OA).
authors.affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, Dalian University of Technology, Dalian 116024, China. hxzhao@dlut.edu.cn
authors.forename: Hongxia
authors.initials: H
authors.lastname: Zhao
authors.forename: Qing
authors.initials: Q
authors.lastname: Xie
authors.forename: Feng
authors.initials: F
authors.lastname: Tan
authors.forename: Jingwen
authors.initials: J
authors.lastname: Chen
authors.forename: Xie
authors.initials: X
authors.lastname: Quan
authors.forename: Baocheng
authors.initials: B
authors.lastname: Qu
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.forename: Xiaona
authors.initials: X
authors.lastname: Li
mesh_terms: D000388:Air / Q000032:analysis*; D002849:Chromatography, Gas; D055768:Halogenated Diphenyl Ethers / Q000032:analysis*; D016018:Least-Squares Analysis; D000442:Octanols / Q000737:chemistry*; D021281:Quantitative Structure-Activity Relationship; D011789:Quantum Theory; D013696:Temperature
chemical_list: D055768:Halogenated Diphenyl Ethers; D000442:Octanols