Journal of Ecology and Rural Environment ›› 2016, Vol. 32 ›› Issue (1): 96-101.doi: 10.11934/j.issn.1673-4831.2016.01.016

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Analysis and Evaluation of Heavy Metal and Polycyclic Aromatic Hydrocarbons in Water and Sediment of Lake Dishui

LI Juan-ying, SHI Wen-xuan, CUI Yu, LI Run-qi   

  1. Aquatic Animal Genetics and Breeding Center of Shanghai Ocean University/Shanghai Synergetic Innovation Center, Shanghai 201306, China
  • Received:2015-05-14 Online:2016-01-25 Published:2016-01-27

Abstract:

In order to assess environmental impacts of the development of the Lingang area on water environment of Lake Dishui, samples were collected from the surface water layer and sediment of the lake for analysis of contents of heavy metals and polycyclic aromatic hydrocarbons(PAHs) with atomic absorption spectrophotometers(TAS990), flow injection two-channel atomic fluorescence spectrophotometers(AFS-9130) and high performance liquid chromatography(HPLC). Single factor analysis, Hakanson potential risk assessment and principal component analysis were performed to assess pollution risks and analyze sources of the pollutants. Results show that Hg were the predominant pollutant in the surface water layer, while Cd and Hg were in the sediment; and a total of 16 species of PAHs were found, varying in the range from 66 to 269 ng·L-1 in content and dominated with lower molecular weight PAHs(2- and 3-ring PAHs) in the water of the surface water layer, and varying in the range from 46 to 54 ng·g-1(dry weight) and dominated with high molecular weight PAHs(4- and 6-ring PAHs) in the sediment. On the whole, heavy metals posed a very high ecological risk. Cu, Pb and Hg in the sediment came mainly from the tidal flat matrix and Cd possibly came from industrial activities and domestic sewage in the upper streams. The pollution of PAHs was very low, but carcinogenic PAHs made up a quite big proportion. And the pollutants in the sediment came mainly from the nature.

Key words: heavy metal, PAHs, Lake Dishui, risk assessment

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