Pollution and ecological risk assessment of sediments in sewage-received river of Jilin
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Abstract:
Jilin is one of the most important chemical industry cities located in China’s northeastern old industrial base. Heavy metals and polycyclic aromatic hydrocarbons (PAHs) have been detected in the sediments of different regions in China, but little is known about the sewage-received river of Jilin, whose pollution was very severe owing to long-time discharge of industrial and municipal wastewater. The aim of this study was to investigate the pollution of heavy metals and PAHs in sediments and to assess their ecological risks. A total of 35 sediment samples from 12 monitoring sections along this sewage-received river were collected for determination of the concentrations of 8 heavy metals (Hg, Pb, As, Cu, Zn, Cr, Cd, Ni) and 16 USEPA priority pollutant PAHs. Geoaccumulation index, H?kanson potential ecological risk index, and sediment quality guidelines (SQGs) were respectively used to assess the pollution and potential ecological risks of these pollutants in the sediments. The concentrations of heavy metals and PAHs were higher than the background values, especially those of Hg, Pb, Cu, As, NAP, and ANT. The geoaccumulation index indicated that the ecological risks of heavy metals in the sediments from high to low were as follows: Hg＞Pb＞As＞Cu＞Zn＞Cr＞Cd＞Ni. The H?kanson potential ecological risk indexes of heavy metals were ranked as follows: Hg＞As＞Cd＞Pb＞Cu＞Ni＞Zn＞Cr. SQGs indicated that adverse benthic impacts would occur frequently. The sediments were polluted by PAHs and heavy metals, especially Hg.
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