Chlorinated polycyclic aromatic hydrocarbons in surface sediment from Maowei Sea, Guangxi, China: occurrence, distribution, and source apportionment

• Published in: Environmental science and pollution research international 2017-07, Vol.24 (19), p.16241-16252
• Main Authors: Wang, Yu-jie, Liao, Ri-quan, Liu, Wen-long, Kannan, Kurunthachalam, Ohura, Takeshi, Wu, Ming-hong, Ma, Jing
• Format: Article
• Language: English
• Subjects: Aquatic Pollution; Aromatic compounds; Atmospheric Protection/Air Quality Control/Air Pollution; China; Chlorinated hydrocarbons; Chlorination; Combustion; Congeners; Contaminated sediments; Dioxins; Earth and Environmental Science; Ecological risk assessment; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental Monitoring; Environmental science; Estuaries; Estuarine environments; Factorization; Geologic Sediments; Hydrocarbons, Chlorinated; Industry; Marine ecology; Matrices (mathematics); Petrochemicals; Petrochemicals industry; Polycyclic aromatic hydrocarbons; Polycyclic Aromatic Hydrocarbons - analysis; Research Article; Sediment samplers; Sediments; Vehicle emissions; Waste Water Technology; Water Management; Water Pollutants, Chemical - analysis; Water Pollution Control
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-017-9193-0

Chlorinated polycyclic aromatic hydrocarbons (ClPAHs) with three to five aromatic rings have been documented to ubiquitously occur in environmental matrices. In this study, residual concentrations and profiles of 20 individual ClPAHs were determined in 35 surface sediment samples from Maowei Sea, a semi-enclosed shallow inland bay located in the northwestern part of South China Sea. The concentrations of ΣClPAHs in sediment ranged from 313 to 9650 pg/g dw with a detection rate of 43–100%. Of the individual ClPAH congeners, 9-ClPhe was the most abundant in Maowei Sea with the concentrations that ranged from 99.9 to 3610 pg/g dw (mean 1120 pg/g dw). High-molecular-weight ClPAH congeners (four to five rings) were predominant in sediments from sampling locations near a petrochemical industrial complex, whereas low-molecular-weight ClPAH congeners (three rings) were predominant in sediments from estuarine and mangrove locations. A positive matrix factorization (PMF) model in combination with dioxin-like toxic equivalency quotient (TEQ) results was used to apportion sources of ClPAHs. Vehicular emission, combustion/chemical industrial processes, and two other unknown sources accounted for 40.1, 25.5, 20.8, and 13.6%, respectively, of ClPAH sources in sediment; their contribution to TEQs in sediments were 24.2, 40.5, 19.3, and 16.0%, respectively. Further investigations are needed to elucidate potential sources and ecological risks of ClPAHs in sediments.