| 不同污染区土壤汞的分布特征及变化规律 |
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| 引用本文： | 李家飞,刘鸿雁,陈 竹,饶 程,姜 畅,李政道.不同污染区土壤汞的分布特征及变化规律[J].土壤,2020,52(1):160-166. |
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| 作者姓名： | 李家飞 刘鸿雁 陈 竹 饶 程 姜 畅 李政道 |
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| 作者单位： | 贵州大学资源与环境工程学院,贵州大学农学院,贵州大学农学院,贵州大学资源与环境工程学院,贵州大学资源与环境工程学院,贵州大学农学院,贵州大学农学院 |
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| 基金项目： | 国家自然科学基金项目（41461097）；贵州省教育厅重点实验室项目（黔教合KY字[2016]001）；国家基金委-贵州省人民政府联合基金项目（U1616442-2） |
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| 摘 要： | 为揭示不同污染区重金属汞在土壤中的存在形态及分布特征,选取万山汞矿区、大龙燃煤电厂区为研究区域,以无污染区花溪区为对照,选择优化的Tessier连续化学浸提法进行汞的形态分析。结果表明:万山汞矿区与大龙燃煤电厂的土壤总汞平均值分别为22.7 mg/kg和0.648 mg/kg,均超过我国土壤环境质量二级标准(0.5 mg/kg),无污染对照区土壤总汞平均为0.179 mg/kg。在水平方向上,万山汞矿区靠近污染源的土壤汞含量相对较高,随着距离的增加而下降;大龙燃煤电厂区土壤汞在距燃煤电厂2.5 km范围内呈现先减小后增大的趋势。汞矿区土壤汞主要以残渣态(66.6%)为主,其次为有机结合态(30.0%);燃煤电厂则主要以有机结合态(75.7%)为主,其次为残渣态(17.46%);无污染区主要以残渣态(59.1%)为主,其次为有机结合态(28.9%)。内梅罗污染综合指数显示,万山汞矿区的土壤污染指数为107,为重度污染,这与污染源强度大有关,2004—2017年,总汞含量呈下降趋势;大龙燃煤电厂土壤污染指数为1.57,为轻度污染,同时土壤汞以有机结合态为主,潜在生物有效性相对较高,有一定的环境生态风险。
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| 关 键 词： | 汞矿区 燃煤电厂区 土壤 汞 形态分布 |
| 收稿时间： | 2018/5/10 0:00:00 |
| 修稿时间： | 2018/6/8 0:00:00 |
Speciation and Changes of Soil Hg in Different Pollution Areas |
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| LI Jiafei,LIU Hongyan,CHEN Zhu,RAO Cheng,JIANG Chang and LI Zhengdao.Speciation and Changes of Soil Hg in Different Pollution Areas[J].Soils,2020,52(1):160-166. |
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| Authors: | LI Jiafei LIU Hongyan CHEN Zhu RAO Cheng JIANG Chang and LI Zhengdao |
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| Institution: | College of Resources and Environmental Engineering, Guizhou University,Guizhou University College of Agriculture,Guizhou University College of Agriculture,College of Resources and Environmental Engineering, Guizhou University,College of Resources and Environmental Engineering, Guizhou University,Guizhou University College of Agriculture,Guizhou University College of Agriculture |
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| Abstract: | In order to reveal the existence and distribution characteristics of heavy metal Hg in soils in different polluted areas, Wanshan mercury mine area and Dalong coal-fired power plant area were selected as the study area, and Huaxi district in the unpolluted area was selected as the control, and the optimized Tessier continuous chemical extraction was selected. The mercury morphological analysis was performed. The results showed that the average mercury content of mercury in the Wanshan mercury mine and Dalong coal-fired power plant was 22.7 mg/kg and 0.648 mg/kg, respectively, both exceeding the secondary standards for soil environmental quality in China (0.5 mg/kg). The area of soil total mercury was 0.179 mg/kg. In the horizontal direction, the content of mercury in the soil near the pollution source in the Wanshan mercury mining area is relatively high, and it decreases significantly with the increase of distance; the soil mercury in the Dalong coal-fired power plant area first decreases within 2.5 km from the coal-fired power plant. Increased trend. Mercury in the mercury mining area is mainly in the residual state (66.6%), followed by the organically bound state (30.0%); coal-fired power plants are mainly dominated by organic bonding (75.7%), followed by the residue state (17.46%); The non-polluted areas were mainly in the residue state (59.1%), followed by the organically bound state (28.9 %). The comprehensive index of the Nareom pollution shows that the soil pollution index of the Wanshan mercury mining area is 107, which is heavily polluted, which is related to the intensity of the pollution source; the soil pollution index of Dalong Coal-fired Power Plant is 1.57, which is mild pollution, but the soil mercury The organic binding state dominates, the potential biological effectiveness is relatively high, and the pollution source persists, which has certain environmental and ecological risks. |
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| Keywords: | mercury mining area coal-fired power plant area soil morphological distribution |
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