Journal
MARINE POLLUTION BULLETIN
Volume 101, Issue 2, Pages 972-985Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2015.10.023
Keywords
Estuary; Mangrove; Aquaculture; Toxicity; Source attribution; Beibu; Gulf
Funding
- German Ministry for Education and Science (BMBF) [03F0607A, 03F0607B]
- German Science Foundation (DFG) [WA2157/4-1]
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Surface sediments from the central and coastal Beibu Gulf, southern China, were analyzed for persistent organic pollutants. The absence of polychlorinated biphenyls (PCB; generally below detection limit), low concentrations of polycyclic aromatic hydrocarbons (PAH; 24-647 ng g(-1)), and locally high contamination with organo-chloro pesticides (DDT; 0.03-92 ng g(-1)) reflect the early stages of development in southwest China, with human activities dominated by agriculture and low impact of industry. Concentrations of PCB and PAH indicate no ecological risk, while DDT accumulation poses a probable toxic risk in coastal but not in shelf sediments. Diagnostic ratios suggest PAH originating mainly from combustion of biomass and diesel fuels, and recent DDT use in agriculture and antifouling paint. Distribution patterns along the coastal-shelf-gradient indicate mainly airborne transport of PAH and waterborne transport of DDT. In the central Gulf, also water column samples reveal low concentrations of PAH (1.7-7.8 ng L-1) and DDT (0.006-0.053 ng L-1). (C) 2015 Elsevier Ltd. All rights reserved.
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