北京市平谷区金矿区周边土壤砷、汞赋存形态特征及生态风险评价

周颖; 王雪梅; 蒋玉琢; 赵云峰; 季宏兵

doi:10.13205/j.hjgc.202108028

北京市平谷区金矿区周边土壤砷、汞赋存形态特征及生态风险评价

doi: 10.13205/j.hjgc.202108028

1. 北京科技大学能源与环境工程学院, 北京 100083;
2. 北京市地质工程设计研究院, 北京 101500;
3. 首都师范大学资源环境与旅游学院, 北京 100048

基金项目:

国家自然科学基金项目（41173113；41473122）。

详细信息

作者简介:
周颖(1995-),女,硕士,主要研究方向为环境地球化学。zhouying6363@126.com

通讯作者:
季宏兵(1966-),男,博士,教授,主要研究方向为环境生物地球化学。ji.hongbing@hotmail.com

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- 文章访问数: 142
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- 被引次数: 0
出版历程
- 收稿日期: 2020-06-30
- 网络出版日期: 2022-01-18

SPECIATION AND ECOLOGICAL RISK ASSESSMENT OF ARSENIC AND MERCURY IN SOIL AROUND A GOLD MINING AREA IN PINGGU DISTRICT, BEIJING

1. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Geological Engineering Design and Research Institute, Beijing 101500, China;
3. College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China

摘要

摘要: 以北京市平谷区金矿区周边土壤为研究对象，采集40个表层（0~20 cm）土壤样品，测定土壤中As、Hg总量及其各赋存形态含量，并采用基于重金属形态的次生相原生相分布比值法（ratio of secondary phase to primary phase，RSP）和风险评价编码法（risk assessment code，RAC）对土壤中As、Hg污染程度及生态风险进行评价。结果表明：各采样区土壤中As、Hg总量均超出北京市土壤背景值，分别超出3.94~13.24，11~41.33倍；土壤中As、Hg主要以残渣态存在，除残渣态外，As主要以铁锰氧化态存在，开采沟和尾矿库土壤中Hg主要以碳酸盐结合态存在，开采沟下游和尾矿库外土壤中Hg则主要以强有机态存在；污染程度和生态风险评价结果显示，开采沟及下游土壤As、Hg污染程度较低，研究区土壤中As、Hg整体表现较低风险，在开采沟、YZ尾矿库和JHH尾矿库存在Hg的高风险和极高风险点位，应予以重视。研究结果为治理金矿区周边土壤As、Hg污染提供参考。
- 重金属 /
- 金矿 /
- 尾矿库 /
- 赋存形态 /
- 生态风险
Abstract: Concentrations and speciation characteristics of arsenic and mercury in 40 surface soil samples around a gold mining area in Pinggu District of Beijing were determined. The pollution and ecological risk of arsenic and mercury were evaluated by the Ratio of Secondary Phase to Primary Phase (RSP) and Risk Assessment Code (RAC). The results showed that the average concentrations of arsenic and mercury in the soil exceeded the background values of soil, by 3.94~13.24 times and 11~41.33 times respectively; arsenic and mercury were primarily dominated by residual fraction, in addition to the residual fractions, arsenic in the soil of mining gully and tailings pond was bound to the Fe-Mn oxides, whereas mercury in the soil downstream of mining gully and outside the tailings pond was bound to the carbonate and the organics; the results of the pollution and ecological risk showed that the pollution degree of arsenic and mercury in the soil of mining gully and downstream was relatively lower, in the soil of the study area arsenic and mercury were at lower risk; in the soil of mining gully, YZ tailings pond and JHH tailings pond mercury were at high and extremely high risk, respectively, which should be paid attention to. The results provided a reference for treating arsenic and mercury pollution in the soil around the gold mining area.
- heavy metal /
- gold mine /
- mine tailings /
- speciation /
- ecological risk

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