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EXAMINING THE EXTRACTION EFFICIENCY OF PETROLEUM-DERIVED DISSOLVED ORGANIC MATTER IN CONTAMINATED GROUNDWATER PLUMES
Zito, P., R. Ghannam, B.A. Bekins, and D.C. Podgorski.
Groundwater Monitoring & Remediation [Published online 9 August 2019 prior to print]

Five different techniques were used to extract petroleum-derived dissolved organic matter (DOM) in groundwater samples from an aquifer contaminated with crude oil to determine the optimal technique to analyze for petroleum-derived DOM. The methods tested were liquid-liquid extraction (LLE), total petroleum hydrocarbons-diesel range (TPHd), and three solid-phase extraction (SPE) stationary phases used for extraction of polar analytes from water. For LLE and TPHd, the extraction efficiency of petroleum-derived DOM decreased downgradient as the petroleum-derived DOM became increasingly polar from biodegradation. In contrast, the average extraction efficiency by the SPE methods was >65% across the gradient and was thus more efficient for extracting petroleum-derived DOM at hydrocarbon-contaminated sites.



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