Non-Targeted Analysis of Petroleum Metabolites in Groundwater Using GC脳GC鈥揟OFMS

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• 作者：Rachel E. Mohler ; Kirk T. O鈥橰eilly ; Dawn A. Zemo ; Asheesh K. Tiwary ; Renae I. Magaw ; Karen A. Synowiec
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：September 17, 2013
• 年：2013
• 卷：47
• 期：18
• 页码：10471-10476
• 全文大小：255K
• 年卷期：v.47,no.18(September 17, 2013)
• ISSN：1520-5851

文摘

Groundwater at fuel release sites often contains nonpolar hydrocarbons that originate from both the fuel release and other environmental sources, as well as polar metabolites of petroleum biodegradation. These compounds, along with other polar artifacts, can be quantified as 鈥渢otal petroleum hydrocarbons鈥?using USEPA Methods 3510/8015B, unless a silica gel cleanup step is used to separate nonpolar hydrocarbons from polar compounds prior to analysis. Only a limited number of these metabolites have been identified by traditional GC鈥揗S methods, because they are difficult to resolve using single-column configurations. Additionally, the targeted use of derivatization limits the detection of many potential metabolites of interest. The objective of this research was to develop a nontargeted GC脳GC鈥揟OFMS approach to characterize petroleum metabolites in environmental samples gathered from fuel release sites. The method tentatively identified more than 760 unique polar compounds, including acids/esters, alcohols, phenols, ketones, and aldehydes, from 22 groundwater samples collected at five sites. Standards for 28 polar compounds indicate that effective limits of quantitation for most of these compounds in the groundwater samples range from 1 to 11 渭g/L.