Pollution levels and risks of polycyclic aromatic hydrocarbons in surface sediments from two typical estuaries in China

摘要

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 928 to 129.24 ng TEQ g(-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 x 10(-6) to 5.6 x 10(-5) and 4 x 10(-6) to 1.6 x 10(-4), and ranged from 7 x 10(-6) to 9.4 x 10(-5) and 2 x 10(-5) to 2.8 x 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. (C) 2016 Elsevier Ltd. All rights reserved.