某有色冶炼企业周围土壤中汞等重金属分布的特征研究

发布时间：2019-02-15 12:53

【摘要】：为考察某有色金属冶炼厂对其周边土壤的重金属污染状况,研究了土壤中汞等重金属的水平分布特征和垂直分布特征。在该厂的厂内、上风向、下风向区域分别进行代表性布点,同时在当地主导风向下风侧最大落地点400 m~2范围内进行棋盘式布点,分层采样,共计96个样品,以GB 15618—2008《土壤环境质量标准》的三级标准为评价标准,对土壤中汞、铅、砷、锌的污染状况及分布特征进行了分析评价。结果表明:厂内土壤汞浓度为355 mg/kg,超出标准限值1.5 mg/kg约239倍;土壤重金属水平分布特征随当地主导风向影响较为明显,而重金属垂直分布特征各异,汞浓度随土层深度增加而升高,砷浓度垂直分布较均匀,锌浓度的垂直分布特征不明显。
[Abstract]:In order to investigate the pollution of heavy metals in the surrounding soil by a non-ferrous metal smelter, the horizontal and vertical distribution characteristics of heavy metals such as mercury in soil were studied. In the plant, the upper wind direction and the lower wind direction area are respectively representative distribution points. At the same time, the chessboard layout points are carried out within the range of 400 mm2 in the local dominant wind direction downwind side maximum falling place, and the samples are stratified and sampled, with a total of 96 samples. The pollution status and distribution characteristics of mercury, lead, arsenic and zinc in soil were analyzed and evaluated according to the third grade standard of GB 15618-2008 "soil Environmental quality Standard". The results showed that the concentration of mercury in the plant was about 239 times higher than the standard limit of 1. 5 mg/kg for 355 mg/kg,. The horizontal distribution characteristics of heavy metals in soil were more obvious with the local dominant wind direction, but the vertical distribution characteristics of heavy metals were different. The mercury concentration increased with the increase of soil depth, the vertical distribution of arsenic concentration was more uniform, and the vertical distribution of zinc concentration was not obvious.
【作者单位】：沈阳环境科学研究院;
【基金】：国家公益性行业科研专项“含汞废物处置过程污染特征及污染风险控制技术研究”(201509054)
【分类号】：X758;X53

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