石河子市区土壤微量汞空间分布及风险评价

发布时间：2018-04-30 11:50

本文选题：土壤 + 微量汞含量　；参考：《环境化学》2017年02期

【摘要】：采集石河子市区土壤样品71个,测定其微量汞含量,系统分析了汞含量的空间分布,并对市区土壤汞污染水平和风险进行评价.结果表明,石河子市区微量汞含量变化范围为0.001—0.902 mg·kg-1,所采的土壤样汞含量均低于国家二级标准,但其平均值要比新疆土壤背景汞含量(0.017 mg·kg-1)高;土壤汞含量的总体特征分布以东北部的氯碱生产和燃煤电厂为中心呈现逐级递减趋势,市区东北方向汞含量最高,而以东南地区的汞含量最低.基于国家土壤二级标准的单因子污染指数法(平均值0.175)、地积累指数法(平均值1.539)和潜在风险指数法相结合能更直观地反映石河子市区的污染水平和潜在风险程度;土壤风险健康评价发现土壤汞经摄食途径进入人体的健康风险均低于正常水平.
[Abstract]:A total of 71 soil samples from Shihezi city were collected and their trace mercury content was determined. The spatial distribution of mercury content was systematically analyzed and the level and risk of mercury pollution in urban soil were evaluated. The results showed that the range of trace mercury content in Shihezi urban area was 0.001-0.902 mg / kg ~ (-1). The mercury content of soil samples collected was lower than that of the second grade national standard, but the average value was higher than that of soil background mercury content of 0.017 mg 路kg ~ (-1) in Xinjiang. The overall characteristics of soil mercury content in the northeast of the distribution of chlor-alkali production and coal-fired power plants as the center of a gradual decline trend, the urban area in the northeast direction of mercury content is the highest, but in the southeast region of mercury content is the lowest. The combination of single factor pollution index method (mean value 0.175), land accumulation index method (average 1.539) and potential risk index method based on national soil secondary standard can more directly reflect the pollution level and potential risk degree of Shihezi city. The health assessment of soil risk showed that the health risk of mercury entering human body was lower than normal level.
【作者单位】：石河子大学化学化工学院新疆兵团化工绿色过程重点实验室省部共建国家重点实验室培育基地材料化工新疆维吾尔自治区重点实验室;
【基金】：国家自然科学基金(21467026,21267020) 石河子大学校级课题(400381010)资助~~
【分类号】：X53;X825

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