δ13C values of polycyclic aromatic hydrocarbons collected from two creosote-contaminated sites

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doi: 10.1016/S0009-2541(98)00095-3
Authors:Hammer, Beth Trust; Kelley, Cheryl A.; Coffin, Richard B.; Cifuentes, Luis A.; Mueller, James G.
Author Affiliations:Primary:
U. S. Environmental Protection Agency, National Research Council, Gulf Breeze, FL, United States
Other:
University of Oklahoma, United States
Pennsylvania State University, United States
Texas A&M University, United States
SBP Technologies, United States
Volume Title:Variability of isotope compositions in modern and fossil organic matter
Volume Authors:Macko, Stephen A., editor; Engel, Michael H.; Freeman, Katherine
Source:Chemical Geology, 152(1-2), p.43-58; Geological Society of America, 1995 annual meeting , symposium on Variability of isotope compositions in modern and fossil organic matter, New Orleans, LA, Nov. 5, 1995, edited by Stephen A. Macko, Michael H. Engel and Katherine Freeman. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1998
Note:In English. 30 refs.; illus., incl. 2 tables, sketch maps
Summary:Groundwaters were sampled on two dates from several wells at each of two creosote-contaminated waste sites in Florida. Polycyclic aromatic hydrocarbons (PAHs) were extracted from the groundwaters, and their individual concentrations were measured by gas chromatography/flame ionization detection (GC/FID). The δ13C values of the PAHs were then determined by gas chromatography/ion trap mass spectrometry/isotope ratio mass spectrometry (GC/ITMS/IRMS). At the American Creosote Works (ACW) in Pensacola, concentrations of PAHs were found to decrease by over four orders-of-magnitude, both with increasing depth and with increasing distance from the most contaminated area. At a wood-preserving facility in Gainesville, concentrations were also found to decrease with increasing distance from the most contaminated area. At the ACW site, δ13C values of individual PAHs ranged from -20.09 per mil to -32.94 per mil, although the majority of compounds fell in a tighter range between -22.66 per mil and -25.31 per mil. The δ13C values of over 75% of the PAHs remained constant across all wells, both with migration of the contaminant plume and over a 3-month time period. The compounds that showed the highest variability among the wells were anthracene; the heterocyclic compounds thianaphthene, dibenzothiophene, and carbazole; and the lighter PAHs naphthalene, biphenyl, and 2-methylnaphthalene. Variability of these compounds is likely the result of variations in δ13C values among different creosotes added to the sites over many years. The other compounds measured were conserved across the wells and would serve as good tracers of a contaminant plume in bioremediation settings. At the Gainesville site, δ13C values of individual PAHs ranged from -18.87 per mil to -27.05 per mil, with 70% of the values falling between -22.06 per mil and -24.53 per mil. This range is very similar to the values for PAHs at the ACW site. Comparing δ13C values of specific PAHs between the two creosote-contaminated sites, 12 of 16 compounds agreed within 1.0per mil. This indicates that, although there are a few compounds that may be variable across different creosotes, there may be a suite of δ13C values that is conserved across PAHs of creosote origin. These characteristic PAHs could be used to determine whether or not creosote is contributing to the PAH contamination at a site. In addition, the compounds that are variable between different creosotes could be used as tracers of individual creosotes at polluted sites and to differentiate between possible creosote sources. Abstract Copyright (1998) Elsevier, B.V.
Subjects:Aquifers; Aromatic hydrocarbons; C-13/C-12; Carbon; Case studies; Concentration; Contaminant plumes; Creosote; Gas chromatograms; Geochemistry; Ground water; Hydrocarbons; Hydrochemistry; Isotope ratios; Isotopes; Mass spectra; Organic compounds; Pollutants; Pollution; Polycyclic aromatic hydrocarbons; Spectra; Stable isotopes; Transport; Waste disposal; Alachua County Florida; Atlantic Coastal Plain; Escambia County Florida; Florida; Gulf Coastal Plain; Pensacola Florida; United States; Gainesville Florida
Coordinates:N302600 N302600 W0871200 W0871200
N293000 N293500 W0822000 W0822000
Record ID:1999002963
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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