| 姚 娜,彭昆国,刘足根,李惠民,胡林凯,侯 红.石家庄北郊土壤重金属分布特征及风险评价[J].农业环境科学学报,2014,33(2):313-321. |
| 石家庄北郊土壤重金属分布特征及风险评价 |
| Distribution and Risk Assessment of Soil Heavy Metals in the North Suburb of Shijiazhuang City |
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| DOI：10.11654/jaes.2014.02.016 |
| 中文关键词: 城郊土壤 重金属 风险评价 |
| 英文关键词: suburban soil heavy metals risk assessment |
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| 中文摘要: |
| 以河北省石家庄市北郊为研究对象，采用随机布点的方法采集28个城郊土壤，分析了其中7种重金属（Pb、Cr、As、Cd、Ni、Zn和Cu）的总量。应用单污染指数法、内梅罗污染指数法、Hakanson潜在生态风险指数法和《污染场地风险评估技术导则》（报批稿）推荐的风险评价模型等对土壤重金属含量进行了风险评价。结果表明：研究区域土壤中部分重金属的平均含量高于河北省和全国土壤背景值，其中Pb、Cd和Cu均值为背景值的1.5~2.5倍，Cr、Ni和Zn均值为背景值的1.0~1.5倍，表明研究区域土壤受人为活动影响明显。土壤中各重金属的单项污染指数大小顺序为Cu>Ni>Cd>Zn>Cr>Pb>As，整个研究区土壤环境质量内梅罗污染指数为0.738，表明该区域土壤尚清洁。土壤中重金属的潜在生态风险指数大小顺序为Cd>Pb>Cu>As>Cr>Ni>Zn，平均潜在生态风险均值为90.5，处于轻微生态危害等级。研究区域内不同重金属对人体健康的致癌风险大小顺序为Cr>As>Ni>Cd，非致癌风险大小顺序为Cr>As>Ni>Cu>Cd>Zn，其中以Cr和As的致癌和非致癌风险最高，超过其风险阈值10E-06和1。当地土壤存在一定的潜在生态风险，需要采取适当的风险控制措施，以防止土壤继续污染，确保当地人群的健康权益。 |
| 英文摘要: |
| This study focused on the distribution and risk assessment of soil heavy metals in the north suburb of Shijiazhuang city. Total concentrations of Pb, Cr, As, Cd, Ni, Zn and Cu in 28 soil samples randomly collected were analyzed. Single pollution index, Nemerow pollution index, Hakanson potential ecological risk index and technical guidelines for risk assessment of contaminated sites etc, were used to assess ecological and human health risk of heavy metals. Average contents of some metals investigated were higher than the soil background values of both Hebei Province and China. Contents of soil Pb, Cd and Cu were 1.5~2.5 times of the soil background values, and those of Cr, Ni and Zn were 1.0~1.5 folds of the soil background values, showing anthropogenic contamination of these metals. The single pollution index of heavy metals in the soils was in order of Cu>Ni>Cd>Zn>Cr>Pb>As. The Nemerow pollution index was 0.738 in the whole area, implying that the soil in this area was clean. However, the average potential ecological risk was 90.53, which indicated slightly ecological hazard; the risk was in order of Cd>Pb>Cu>As>Cr>Ni>Zn. The cancer risk of exposure was ranked as Cr>As>Ni>Cd, and the non-cancer risk of exposure as Cr>As>Ni>Cu>Cd>Zn. Therefore, Cr and As were the most potentially harmful metals among heavy metals investigated, and their concentrations in soil were higher than the US EPA soil management standards of 10E-06 and 1, respectively. In conclusion, heavy metals have certain potential ecological risks in the north suburb soils of Shijiazhuang and it is therefore necessary to prevent the soils from further pollution by heavy metals in this region. |
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