摘要:

Characterizing pseudo equilibrium-status soil/vegetation partition coefficient K-sv, the quotient of respective concentrations in soil and vegetation of a certain substance at remote background areas, is essential in ecological risk assessment, however few previous attempts have been made for field determination and developing validated and reproducible structure-based estimates. In this study, K-SV was calculated based on measurements of seventeen 2,3,7,8-substituted PCDD/F congeners in soil and moss (Dicranum angustum), and rouzi grass (Thylacospermum caespitosum) of two background sites, Ny-Alesund of the Arctic and Zhangmu-Nyalam region of the Tibet Plateau, respectively. By both fugacity modeling and stepwise regression of field data, the air-water partition coefficient (K-AW) and aqueous solubility (S-W) were identified as the influential physicochemical properties. Furthermore, validated quantitative structure-property relationship (QSPR) model was developed to extrapolate the K-SV prediction to all 210 PCDD/F congeners. Molecular polarizability, molecular size and molecular energy demonstrated leading effects on K-SV. (C) 2014 Elsevier B.V. All rights reserved.

附注:

Times Cited: 2Hu, Jianxin/N-3498-2013; Li, Li/Li, Li/0000-0002-5157-736621321873-3336