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

被引：58

作者：

Adhikari, Puspa L. ^{[1
,2
]}

Maiti, Kanchan ^{[1
]}

Overton, Edward B. ^{[2
]}

Rosenheim, Brad E. ^{[3
]}

Marx, Brian D. ^{[4
]}

机构：

[1] Louisiana State Univ, Dept Oceanog & Coastal Sci, Baton Rouge, LA 70803 USA

[2] Louisiana State Univ, Dept Environm Sci, Baton Rouge, LA 70803 USA

[3] Univ S Florida, Coll Marine Sci, St Petersburg, FL 33701 USA

[4] Louisiana State Univ, Dept Expt Stat, Baton Rouge, LA 70803 USA

来源：

ENVIRONMENTAL POLLUTION | 2016年 / 212卷

关键词：

Polycyclic aromatic hydrocarbons (PAHs); Sediment; Gulf of Mexico; Deepwater horizon oil spill; Radiocarbon (Delta C-14); DEEP-WATER-HORIZON; ORGANIC-MATTER; OIL; RADIOCARBON; MARINE; PAHS; CARBON; ASSOCIATIONS; DEGRADATION; PERSISTENCE;

D O I：

10.1016/j.envpol.2016.01.064

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 Sigma PAH(43) and their accumulation rates vary between 44 and 160 ng g(-1) and 6-55 ng cm(-2) y(-1), respectively. Sigma PAH(43) concentration profiles, accumulation rates and Delta C-14 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. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：413 / 423

页数：11

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