| Bosten Lake is China’s largest inland freshwater lake so far, is the water tail of the Kaidu River, yellow ditch and located in the upstream region of the Peacock River. To make clear the main ecological environmental problems the Bosten Lake facing and recognize the influence factors and influence degree, Xinjiang Environmental Protection Science Institute compiled “the implementation of the programme of Bosten Lake ecological environment protection baseline investigation”, the subject completed through the extensive collection of data and systematic investigations, comprehensive grasp the influencing factors of Bosten Lake basin ecological security, provide the basis for scientific decision in Bosten Lake Basin comprehensive management and protection of ecological environment.Heavy metals are difficult to degrade, highly biological toxicity, to understand the temporal and spatial distribution, pollution assessment and sources of pollution is important for Bosten Lake pollution prevention and control.Paper with heavy metals in the sediment in Bosten Lake as the research object, in April 2013- November 2014, in Bosten Lake, a total of 17 samples collected in Bosten Lake sediment, a total of 8 times. Then according to the requirements specification method determined amount of Bosten Lake Bottom Mud in 9 kinds of heavy metals(Cu, Pb, Zn, Ni, Cr, Co, Hg, As, Cd), total organic carbon, total nitrogen and other indicators, analysis of the temporal and spatial distribution characteristics, and select the corresponding evaluation method on the evaluation of heavy metal pollution and potential ecological risk assessment, and analyzes the pollution sources, in order to strengthen people’s understanding of heavy metal pollution in Bosten Lake, which provides more detailed data for water quality of Bosten Lake Management.Main conclusions:(1) the heavy metal content of seasonal variation: changing trends in the two years of heavy metals in presents inverted "V" and "N" type two forms and various heavy metals were in July reached peak year, after a preliminary analysis, the Bosten Lake water supply and have certain relations.(2) heavy metal spatial distribution characteristics: of six kinds of heavy metals such as Cu, Pb and distribution of the hydrodynamic conditions of the basic and Bosten Lake zoning distribution consistent. Study area south of the sampling points(No. 1 and No. 2) of heavy metals in the surface sediments are usually of high content and southwest of the study area sampling points(13, 14 sites was higher, from the northwest yellow inlet into the lake sampling points(7, 8, 9, 10, 11, 12,) was the smallest. Hg and Cd showed no spatial distribution of the partition rules, and the Bosten Lake recharge water pollution on the surrounding.(3) single factor evaluation showed that there are 6 kinds of heavy metal content, 3 kinds of heavy metals unqualified. From the comprehensive evaluation, four points of the sediment in the heavy metals in almost two years are mild pollution. Potential ecological risk assessment indicated that 9 kinds of heavy metals(Hg, Cd two heavy metal ecological harm was higher than that of other heavy metals; sampling points in 14 point two years in heavy metal comprehensive potential ecological risk index is lower than that of other more high.(4) according to the seasonal variation of heavy metals, the peak of July may be the partial heavy metals in the runoff during the runoff of the upstream of the river basin.. In the case of considering the accumulation of heavy metals, the further speculation may be due to the partial heavy metal caused by the spring snow melting flood.. This conclusion needs to be further verified.According to the characteristics of spatial variation of heavy metals, and combine with the actual investigation, suggesting that is around Bosteng lake a hot pepper manufacturing enterprises, a sugar enterprises, a tomato products factory outfall near Bosten southern or southwestern industrial enterprises wastewater into the Bosten Lake in some way. |
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