预测土壤中存在混合污染物时目标烃类的生物降解情况。
Predicting the biodegradation of target hydrocarbons in the presence of mixed contaminants in soil.
作者信息
Stroud Jacqueline L, Paton Graeme I, Semple Kirk T
机构信息
Department of Environmental Science, The Lancaster Environment Centre, Lancaster University, Lancaster, UK.
出版信息
Chemosphere. 2009 Jan;74(4):563-7. doi: 10.1016/j.chemosphere.2008.09.071. Epub 2008 Nov 13.
The aim of this study was to investigate the prediction of (14)C-phenanthrene and (14)C-hexadecane biodegradation in the presence of other hydrocarbons in soil using beta- and alpha-cyclodextrin (CD) solutions, respectively. Prediction of the biodegradation of (14)C-phenanthrene using the beta-CD extraction was robust under single, co-contaminant and multiple contaminant conditions (r(2)=0.92, slope of best fit line=0.87, intercept=7.24, n=84). Prediction of (14)C-hexadecane using the alpha-CD extraction was robust under single and co-contaminant conditions (r(2)=0.92, slope of best fit line=0.97, intercept=1.24, n=60); however, the alpha-CD could not accurately predict (14)C-hexadecane biodegradation in the presence of multiple contaminants. The presence of multiple contaminants enhanced (14)C-hexadecane mineralisation, but did not enhance extractability. The results from this study provide further evidence for the application of HPCD extractions for the measurement of microbial accessibility in soil.
本研究的目的是分别使用β-环糊精（β-CD）和α-环糊精（α-CD）溶液，研究在土壤中存在其他烃类的情况下，（14）C-菲和（14）C-十六烷生物降解的预测情况。在单一、共污染和多污染物条件下，使用β-CD萃取预测（14）C-菲的生物降解效果良好（r(2)=0.92，最佳拟合线斜率=0.87，截距=7.24，n=84）。在单一和共污染条件下，使用α-CD萃取预测（14）C-十六烷的效果良好（r(2)=0.92，最佳拟合线斜率=0.97，截距=1.24，n=60）；然而，α-CD无法准确预测在存在多种污染物的情况下（14）C-十六烷的生物降解。多种污染物的存在增强了（14）C-十六烷的矿化作用，但没有增强其可萃取性。本研究结果为应用羟丙基环糊精（HPCD）萃取法测量土壤中微生物可及性提供了进一步的证据。
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