Comparison of polycyclic aromatic hydrocarbon distributions and sedimentary organic matter characteristics in contaminated, coastal sediments from Pensacola Bay, Florida

Marine Environmental Research
Myrna J SimpsonP G Hatcher

Abstract

In this study, we examined the distribution of polycyclic aromatic hydrocarbons (PAHs) in a contaminated coastal area and the characteristics of the natural organic matter in tandem. We present a detailed study of PAH concentration, distribution, and organic matter characteristics of three core samples from Pensacola Bay, Florida. Solid-state 13C Nuclear Magnetic Resonance (NMR), pyrolysis gas chromatography coupled with mass spectrometry (GC-MS), and tetramethyl ammonium hydroxide (TMAH) thermochemolysis GC-MS were applied to obtain structural details about the sedimentary organic matter. Elemental compositions (carbon and nitrogen) and estimates of black carbon contents are also reported. These coastal sediments were found to contain more PAHs in the upper 15 cm layers than in the bottom 15-25 cm samples. The samples that contained the most PAHs also contained the least amount of aromatic carbon and contained a significant amount of paraffinic carbon. Lignin-derived pyrolysis and TMAH thermochemolysis products were abundant and generally higher in all of the samples in comparison to those reported for modern coastal sediments, indicating a large flux of terrestrial carbon. The black carbon contents were found to range from 4....Continue Reading

References

Jun 25, 1998·Science·C A Masiello, E R M Druffel
Jan 29, 2002·Environmental Science & Technology·Accardi-Dey Amymarie, Philip M Gschwend
Apr 5, 2002·Journal of Environmental Quality·Karl J DriaPatrick G Hatcher
May 25, 2002·Environmental Science & Technology·Myrna J SalloumPatrick G Hatcher

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Citations

Mar 7, 2009·Environmental Monitoring and Assessment·L Salazar-CoriaC González-Macías
Nov 17, 2014·Environmental Monitoring and Assessment·Jaqueline NicoliniAntonio S Mangrich
Feb 28, 2006·Environmental Research·Joyce Mara dos Santos BarbosaMary Santiago-Silva
Apr 17, 2009·Environmental Science & Technology·Benny Chefetz, Baoshan Xing

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