Distribution, Elimination, and Rearrangement of Cyclic Volatile Methylsiloxanes in Oil-Contaminated Soil of the Shengli Oilfield, China

Environmental Science & Technology
Yali ShiYaqi Cai

Abstract

Cyclic methylsiloxane standards (D4, D5, and D6) and linear methylsiloxanes (L3 through L16) were detected with high total concentrations (from 5.20 × 10(4) to 1.07 × 10(6) ng/g dw) in 18 oil sludge samples collected from the Shengli oilfield during 2008-2013. In 306 soil samples from this oilfield, the mean concentrations (43.4-125 ng/g dw) and the detection frequencies (65-76%) of D4-D6 were 10.9-11.9 and 2.05-2.24 times higher than those in reference soil samples, respectively. The concentrations of total cyclic siloxanes (ΣCyclic) had positive correlations (R(2) = 0.79, p < 0.05) with the total petroleum hydrocarbons concentration (TPH) in soil, indicating that oil production could release cyclic siloxanes to the environment. During 2008-2013, an increasing tendency (mean of 13.4% per annum) of ΣCyclic was found in soil with high TPH (>5000 mg/kg) but was not found in soil with lower TPH. Elimination experiments showed that petroleum hydrocarbons could reduce the degradation and volatilization rates of D4, D5, and D6 in impacted oilfield soil. The half-lives of D4, D5, and D6 in the opened and capped soil systems with TPH = 400-40 000 mg/kg were 1.19-22.2 and 1.03-7.43 times larger than those in common soil (TPH = 80 mg/kg)...Continue Reading

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Citations

Jan 25, 2017·The Science of the Total Environment·Nai-Xian FengMing-Hung Wong
Dec 5, 2017·Environmental Science and Pollution Research International·Chunhui ZhangWenwen Zhang
Jul 28, 2019·Ecotoxicology and Environmental Safety·Danbi LeeSung-Deuk Choi
Apr 18, 2018·Environmental Science & Technology·De-Chang LiJohn C Crittenden
Aug 21, 2021·Ecotoxicology and Environmental Safety·Xiaoling XiangYaqi Cai

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