Distributions and accumulation rates of polycyclic aromatic hydrocarbons in the northern Gulf of Mexico sediments

Environmental Pollution
Puspa L AdhikariBrian D Marx

Abstract

Sediment samples collected from shelf, slope and interior basin of the northern Gulf of Mexico during 2011-2013, 1-3 years after the Deepwater Horizon (DWH) oil spill, were utilized to characterize PAH pollution history, in this region. Results indicate that the concentrations of surface ΣPAH43 and their accumulation rates vary between 44 and 160 ng g(-1) and 6-55 ng cm(-2) y(-1), respectively. ΣPAH43 concentration profiles, accumulation rates and Δ(14)C values are significantly altered only for the sediments in the immediate vicinity of the DWH wellhead. This shows that the impact of DWH oil input on deep-sea sediments was generally limited to the area close to the spill site. Further, the PAHs source diagnostic analyses suggest a noticeable change in PAHs composition from higher to lower molecular weight dominance which reflects a change in source of PAHs in the past three years, back to the background composition. Results indicate low to moderate levels of PAH pollution in this region at present, which are unlikely to cause adverse effects on benthic communities.

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Citations

Apr 20, 2016·Marine Pollution Bulletin·Puspa L AdhikariPatrick R Jones
Nov 9, 2018·Frontiers in Microbiology·E Ernestina Godoy-LozanoLiliana Pardo-Lopez
Jun 27, 2020·Environmental Science and Pollution Research International·Hernando P BacosaAntonietta Quigg
Apr 20, 2019·Environmental Science and Pollution Research International·Angela de L R WagenerCarlos German Massone
Sep 13, 2019·Environmental Toxicology and Chemistry·Rachel E StruchSteven A Murawski
Nov 19, 2020·Marine Pollution Bulletin·M Chase LawsonDavid N Hala

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