|其他摘要||Based on the increased contents of heavy metals in the environment as well as the pollution problem in Xinjiang oases with the rapid development of economy in recent years, herein, with Ebinur Basin as the research area, the distribution, sources, pollution status, potential ecology and health risks of heavy metals in water body, surface sediments, nearby soil of Bortala river, the dry sediments of Ebinur and the atmosphere dust deposition of the basin have been systematically investigated. The conclusions are as follows:
(1) Descriptive statistics analysis showed that the contents of 8 kinds of heavy metals in the research area do not exceed the limitation values of class II, Soil Quality Standard of China, but the average and maximum values of the heavy metals are higher than the background values of Xinjiang, suggesting that the local economic development in this region has negative influence on the heavy metal contents in the farmland.
(2) The contents of 7 kinds of heavy metals in the surface water of the Bortala River are relatively low, but the maximum values of Hg, Cd, Pb, and Cr are all higher than the limitation values of the Second Surface Water Quality Standard and the Drinking Water Quality Standard values of WHO. This research also showed that the heavy metal contents in the surface sediments of the Bortala River and the nearby soil are significantly higher than that in the river water. In general, the pollution and potential risks of heavy metals in the river water, surface sediments and the nearby soil of Bortala River are relatively low and do not have harmful effect on the environment.
(3) The contents of 8 kinds of heavy metals in the surface sediments of the Ebinur are all lower than the limitation values of class II, Soil Quality Standard of China, but the average and the maximum values are all higher than the background values of Xinjiang. The geo-accumulation index and the potential risks assessment showed that the pollution indexes of heavy metals Cd, Hg, and Pb in the sediments are relatively higher and these heavy metals are the main potential ecology risk factors.
(4) The average annual dust flux in Ebinur Basin is 298.23 g.m-2, and it reached the maximum in March. The research showed that the average and the maximum values of 7 kinds of heavy metals in the atmosphere dusts deposition in Ebinur Basin are relatively low and do not exceed the limitation values of Class II, Soil Quality Standard of China, while the pollution extents of heavy metals Pb, Cd, and Hg of the atmosphere dusts deposition are relatively higher than others. Results showed that the heavy metal pollution was very serious during September 2013 to March 2014, which is closely related with the pollutants from the heating activity in winter in the basin. Health risk assessment of heavy metals showed that the exposure risk of Pb through hand to mouth way intake by the children in the basin is much higher than others.|