TPH and BTEX Quantitation in Gasoline and Diesel Contaminated Soils by ...

Published: Journal of Chromatographic Science, Volume 33, Number 3, March 1995, pp. 98-108.

TPH and BTEX Quantitation in Gasoline and Diesel Contaminated Soils by Capillary Gas Chromatography–Mass Spectrometry
Yuan Xiang and Stephen L. Morgan and Bruce E. Watt

A manual gas chromatographic–mass spectrometric (GC–MS) method for the analysis of total petroleum hydrocarbon (TPH), benzene, toluene, ethyl benzene, o-xylene, m-xylene, and p-xylene (BTEX), and naphthalene in gasoline and diesel contaminated soils is described. Multiple groups of ions are monitored to retain the high sensitivity of selected ion monitoring while permitting identification of solutes. Spiked soil samples containing gasoline and diesel with TPH concentrations in the range of 0.5 to 5000 parts per million are used to evaluate the method. The extraction efficiency of different solvents and solvent mixtures is evaluated. Ethyl ether and methylene chloride give quantitative recoveries for both TPH and BTEX from spiked soils. TPH or BTEX analysis by GC–MS provides excellent sensitivity, linearity of quantitation, and peak identification. The method presented here also eliminates time-consuming sample preconcentration steps for diesel-range components.

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