Citation:

Pace, C. AND L. Betowski. MEASUREMENT OF HIGH-MOLECULAR-WEIGHT POLYCYCLIC AROMATIC HYDROCARBONS IN SOILS BY PARTICLE BEAM HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY/MASS SPECTROMETRY. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-95/457, 1995.

Description:

Polycyclic aromatic hydrocarbons (PAHS) comprise a class of potentially hazardous compounds of concern to the U.S. EPA. he application of particle-beam liquid chromatography/mass spectrometry (PB LC/MS) to measurement of high-molecular-weight PAHs was investigated. nstrument performance was evaluated for 16 PAHs in the molecular weight range of 300 to 450 daltons. he PAHs were separated by reverse-phase high-performance liquid chromatography using a polymeric octadecylsilica (C-18) packing and gradient elution with methanol/tetrahydrofuran. n-column instrument detection limits, as measured by selected ion monitoring on the singly charged molecular ion of each PAH, were found to be 0.15 to 0.60 ng for PAHs within molecular weights up to 352 daltons and 2 to 4 ng for PAHs with molecular weights greater than 352 daltons. nstrument response was generally linear for PAHs with molecular weights 300 to 352 daltons. he PB electron impact mass spectra of the PAHs were found to vary with the ion distribution ratio of singly charged molecular ion to the doubly charged molecular ion, depending on molecular weight, ion source temperature, and concentration. nalysis by PB LC/MS was applied to extracts of PAH-spiked soil and a PAH-contaminated soil from the Pacific Northwest. arget analyte concentrations in the PAH-contaminated soil ranged from 0185 to 84 ug/g. uantitative estimates for non-target PAHs were also determined. nalysis of a second soil extract from the Northeast part of the United States displayed isomeric patterns of high-molecular-weight PAHs similar to those of the Pacific Northwest extract.

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