Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
Environ Pollut. 2011 Oct;159(10):2355-8. doi: 10.1016/j.envpol.2011.06.032. Epub 2011 Jul 14.
Sorption isotherms of BDE-28 and BDE-47 on natural soils with different contents of soil organic matter (SOM) were investigated. Due to low water solubility of BDEs and resulted narrow ranges of aqueous equilibrium concentration, the linear distribution model showed similar and good fitting efficiency to the linear portion of nonlinear Freundlich curve. For the same sample, the linear and nonlinear model fitting sorption coefficients were close. At the statistically significant level of 0.05 or 0.1, significant relationships of total organic carbon fraction (fOC) with the fitting sorption coefficients can be observed. As for BDE-28, the relationships of fOC and SOM fractions with the single point partition coefficients at different aqueous concentrations of BDEs were significant; while for BDE-47, the relationships became less significant or insignificant, especially at higher aqueous concentrations. The findings in this study may facilitate more understanding on transport and fate of studied BDEs in soil systems.
研究了不同土壤有机质（SOM）含量的天然土壤对 BDE-28 和 BDE-47 的吸附等温线。由于 BDEs 的水溶性低，水相平衡浓度范围较窄，线性分配模型对非线性 Freundlich 曲线的线性部分表现出相似且良好的拟合效率。对于相同的样品，线性和非线性模型拟合的吸附系数接近。在 0.05 或 0.1 的统计显著水平下，总有机碳分数（fOC）与拟合吸附系数之间存在显著关系。对于 BDE-28，fOC 和 SOM 分数与不同 BDE 水相浓度下单点分配系数之间的关系显著；而对于 BDE-47，这些关系变得不那么显著或不显著，特别是在较高的水相浓度下。本研究的结果可能有助于更好地理解研究中 BDEs 在土壤系统中的迁移和归宿。
