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Pollution levels and risks of polycyclic aromatic hydrocarbons in surface sediments from two typical estuaries in
Chenglong Wang1, Xinqing Zou2, Yali Li2
1School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China; Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, China.
Abstract:
To assess the environmental risks of polycyclic aromatic hydrocarbons (PAHs), 48 and 45 sediments were collected from the Yangtze River Estuary (YRE) and Pearl River Estuary (PRE), respectively. The toxicity equivalency concentration (TEQ) in the YRE and PRE were ranged from 1.68 to 76.13 and 9.28 to 129.24ngTEQg-1, respectively. Results of risk quotient suggest that ecological risks of two estuaries are at a moderate level, but are higher in the PRE than YRE. The increment lifetime cancer risks (ILCR) from the YRE via ingestion and dermal contact were 1×10-6 to 5.6×10-5 and 4×10-6 to 1.6×10-4, and ranged from 7×10-6 to 9.4×10-5 and 2×10-5 to 2.8×10-4 in the PRE. ILCR results suggest that some low and moderate cancer risk exists in the YRE and PRE. Therefore, monitoring and control measures should be carried out immediately to reduce or eliminate the risks to human health from environmental exposure.
