Tao Yuqiang, Zhang Shuzhen, Wang Zijian, Christie Peter
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
Environ Pollut. 2009 Feb;157(2):545-51. doi: 10.1016/j.envpol.2008.09.030. Epub 2008 Nov 1.
Triolein embedded cellulose acetate membrane (TECAM) was used for passive sampling of the fraction of naphthalene, phenanthrene, pyrene and benzo[a]pyrene in 18 field-contaminated soils. The sampling process of PAHs by TECAM fitted well with a first-order kinetics model and PAHs reached 95% of equilibrium in TECAM within 20 h. Concentrations of PAHs in TECAM (C(TECAM)) correlated well with the concentrations in soils (r(2)=0.693-0.962, p<0.001). Furthermore, concentrations of PAHs determined in the soil solution were very close to the values estimated by C(TECAM) and the partition coefficient between TECAM and water (K(TECAM-w)). After lipid normalization nearly 1:1 relationships were observed between PAH concentrations in TECAMs and earthworms exposed to the soils (r(2)=0.591-0.824, n=18, p<0.01). These results suggest that TECAM can be a useful tool to predict bioavailability of PAHs in field-contaminated soils.
采用三油酸甘油酯包埋醋酸纤维素膜（TECAM）对18种受现场污染土壤中萘、菲、芘和苯并[a]芘的组分进行被动采样。TECAM对多环芳烃的采样过程与一级动力学模型拟合良好，多环芳烃在20小时内在TECAM中达到平衡的95%。TECAM中多环芳烃的浓度（C(TECAM)）与土壤中的浓度相关性良好（r²=0.693 - 0.962，p<0.001）。此外，土壤溶液中测定的多环芳烃浓度与由C(TECAM)和TECAM与水之间的分配系数（K(TECAM-w)）估算的值非常接近。经脂质归一化后，观察到TECAM中多环芳烃浓度与暴露于土壤中的蚯蚓体内多环芳烃浓度之间存在近1:1的关系（r²=0.591 - 0.824，n = 18，p<0.01）。这些结果表明，TECAM可作为预测现场污染土壤中多环芳烃生物可利用性的有用工具。
