某石油污染场地地下水石油烃生物降解的^(13)C、^(34)S同位素证据  

^(13)C and ^(34)S Isotope Evidence for Biodegradation of a Petroleum Hydrocarbon-Contaminated Aquifer in the Northeast of China

作　　者：苏小四[1] 吕航[1] 张文静[1] 张玉玲[1] 焦珣[2] 

机构地区：[1]吉林大学地下水资源与环境教育部重点实验室,长春130026 [2]上海市地质调查研究院,上海200072

出　　处：《吉林大学学报（地球科学版）》2011年第3期847-854,共8页Journal of Jilin University：Earth Science Edition

基　　金：国家水体污染控制与治理科技重大专项(2008ZX07207-007);国家"863"计划项目(2007AA06Z343)

摘　　要：应用稳定同位素技术示踪研究石油烃生物降解作用机理是近年来发展起来的一种有效的新方法。在对某石油污染场地地质和水文地质条件进行详细调查的基础上,分析了场地地下水总石油烃(TPH)、溶解无机碳(DIC)和电子受体(SO24-等)以及稳定C、S同位素等含量的变化规律。研究结果表明:场地地下水不同程度地受到了石油烃类污染,TPH和DIC含量沿地下水流方向逐渐降低,主要电子受体含量和pH相应呈现升高的趋势;场地内污染地下水δ13C值低于未污染地下水δ13C值、且由上游向下游随地下水中DIC含量减少呈逐渐升高的趋势。稳定碳同位素守恒分析结果表明:控制污染场地地下水中DIC含量变化的主要过程为产生CO2的生物降解作用;同时,随着地下水SO24-质量浓度由上游向下游升高,δ34S值逐渐减小。瑞利分馏模型拟合结果证明,场地内发生了以硫酸盐作为电子受体的生物降解反应。The stable isotope technique tracing the mechanism of petroleum hydrocarbon biodegradation is a newly developed and effective method in recent years.The variations of TPH,DIC and the dominant terminal electron accepters（SO2-4 and so on）,δ13C and δ34S of DIC and SO2-4 have been analyzed on the basis of the geological and hydrogeological conditions of a petroleum hydrocarbon contaminated site.The results indicate that the groundwater was contaminated by petroleum hydrocarbons at various degrees and the values of electron accepters and pH increased along the groundwater flow in the central line of the plume while TPH and DIC reduced.The value of δ13C was lower than that of the uncontaminated groundwater and it decreased with DIC along the flow direction.The result of stable carbon isotope balance shows that the increase of DIC of gorundwater is mainly originated from biodegradation of petroleum hydrocarbon.Meanwhile,the values of δ34S decreased along the plume while SO2-4 increased and it can be inferred that the biodegradation of petroleum hydrocarbon with the bacterial sulfate reduction be undergone if the Rayleigh model is assumed.

关 键 词：地下水污染 石油 生物降解 同位素 

分 类 号：P641.3[天文地球—地质矿产勘探] X523[天文地球—地质学]