Monitoring and Risk Assessment on Heavy Metals in Soil at a Mining Area in Fujian
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摘要: 为了解福建闽西矿区周边农田土壤中重金属Cd、Pb、Cr积累特征及健康风险，分别测定了农田土壤中Cd、Pb和Cr含量。通过污染指数法和潜在生态危害指数法评价了研究区农田土壤的污染状况和生态危害程度，并应用概率评估模型评价了3种重金属对人体造成的健康风险。结果表明：研究区农田土壤受到不同程度的Cd、Pb、Cr污染，土壤中各元素的单因子污染指数均值大小顺序为Cd > Pb > Cr，综合污染指数为1.21，整体处于轻度污染等级。土壤中重金属的潜在生态风险指数均值大小顺序为Cd > Pb > Cr，综合潜在生态风险指数为226，整体处于中度生态危害等级。研究区土壤中Cd的致癌风险商尚未超过有关专家所建议的风险阈值10-4，对人体造成致癌风险的可能性较低；Pb的非致癌风险商基本都低于其风险阈值1，不产生健康风险；Cr的致癌风险商有12.9%超过风险阈值（10-4），存在对人体健康构成威胁的可能。Abstract: Accumulation and health risks of heavy metals in the soils around a mine in Fujian were studied. Contents of Cd, Pb and Cr in the agricultural fields nearby were determined. Heavy metal pollution on the soil and damages to the ecology were evaluated based on various indices, and the health risks to humans were assessed using a probability assessment model. The results showed that the soils in the surveyed areas were contaminated by Cd, Pb and Cr to varying extents. The average individual pollutant index on the metals ranked in the order of Cd > Pb > Cr, and the over-all pollution index was 1.21 implying that the soils were under a lightly polluted condition. The average potential ecological risk was Cd > Pb > Cr with a comprehensive ecological risk index of 226 indicating a medium level of ecological hazard. The Cd in the soils was assessed to belower than 10-4, a level less likely to risk cancers in humans as suggested by experts. The non-carcinogen risks index on Pb did not exceed the accepted limit of 1, which ought not to cause any health concerns. On the other hand, the Cr contamination in the soils made the carcinogenic risk index 12.9% greater than the threshold value of 10-4 that could post a thread to human health.
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Key words:
- soil /
- heavy metal /
- contamination /
- mining area /
- risk assessment
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图 3 土壤重金属的单因子污染指数
注：箱形图 (不含点) 从上到下一次为90%分位数、75%分位数、中位数、25%分位数和10%分位数；星号表示异常值，空心方点表示平均值，下图同。
Figure 3. Individual pollutant index on heavy metals in soil samples
图 4 土壤重金属单项生态风险分析
Figure 4. Analysis on single ecological risk index of heavy metals in soil
表 1 综合污染指数评价标准分级
Table 1. Evaluation criteria and classification of over-all pollution index
等级 综合污染指数 污染程度 Ⅰ P综<0.7 清洁 (安全) Ⅱ 0.7<P综≤1 尚清洁 (警戒线) Ⅲ 1<P综≤2 轻度污染 Ⅳ 2<P综≤3 中度污染 Ⅴ P综>3 重度污染 
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表 2 潜在生态风险评价标准分级
Table 2. Evaluation criteria and classification of potential ecological hazard risk
Eri 生态危害
程度RI 生态风险
程度Eri < 40 轻微 RI < 150 轻微污染 40≤Eri < 80 中等 150≤RI < 300 中等污染 80≤Eri < 160 较强 300≤RI < 600 强度污染 160≤Eri < 320 强
RI≥600极强污染 Eri≥320 极强
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表 3 土壤重金属综合污染评价
Table 3. Comprehensive pollution assessment on heavy metals in soil
综合污
染等级P综≤0.7 0.7 < P综≤1 1 < P综≤2 2 < P综≤3 P综>3 程度 清洁 警戒线 轻度污染 中度污染 重度污染 频数/个 41 36 21 1 4 比例/% 40 35 20 1 4
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表 4 土壤重金属潜在生态风险评价
Table 4. Potential ecological risk assessment on heavy metals in soil
综合潜在
生态风险
等级低度风险
RI < 150中度风险
150≤RI
< 300较强风险
300≤RI
< 600很强风险
RI≥600频数/个 34 59 6 4 比例/% 33 57 6 4
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表 5 土壤重金属风险统计
Table 5. Statistics on risks by heavy metals in soil
元素 风险商 最小值 最大值 平均值 中位数 95%暴露位点 97.5%暴露位点 99.5%暴露位点 Cd 7.59×10-8 9.87×10-5 3.94×10-6 2.49×10-6 1.20×10-5 1.64×10-5 3.01×10-5 Pb 0.009 1.47 0.163 0.133 0.378 0.457 0.673 Cr 1.36×10-6 1.19×10-3 5.46×10-5 3.77×10-5 1.55×10-4 2.04×10-4 3.46×10-4
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[1] 杨国华, 郭建文, 王建华.尾矿综合利用现状调查及其意义[J].矿业工程, 2010, 8(1):55-57. http://www.cnki.com.cn/Article/CJFDTOTAL-GWKS201001023.htm [2] 蔡刚刚, 张学洪, 梁美娜, 等.南丹大厂矿区周边农田土壤重金属健康风险评价[J].桂林理工大学学报, 2014, 34(3):554-559. http://www.cnki.com.cn/Article/CJFDTOTAL-GLGX201403025.htm [3] 陈玉东, 王火焰, 周健民, 等.黑龙江省海伦市农田土壤重金属分布特征及污染评价[J].土壤, 2012, 44(4):613-620. http://www.cnki.com.cn/Article/CJFDTOTAL-TURA201204014.htm [4] 王斐, 黄益宗, 王小玲, 等.江西钨矿周边土壤重金属生态风险评价:不同评价方法的比较[J].环境化学, 2015, 34(2):225-233. http://www.cnki.com.cn/Article/CJFDTOTAL-HJHX201502004.htm [5] 王嘉. 铜陵矿区土壤重金属污染现状评价与风险评估[D]. 合肥: 合肥工业大学, 2010. [6] CHABUKDHARA M, NEMA A K. Heavy metals assessment in urban soil around industrial clusters in Ghaziabad, India:probabilistic health risk approach[J]. Ecotoxicology and Environmental Safety, 2013, 87:57-64. doi: 10.1016/j.ecoenv.2012.08.032 [7] KIM M, WOLT J. Probabilistic risk assessment of dietary cadmium in the South Korean population[J]. Food Additives and Contaminants, 2011, 28(1):62-70. doi: 10.1080/19440049.2010.529620 [8] 苏倩怡. 贝类中重金属镉的风险评估[D]. 青岛: 中国海洋大学, 2012: 19-26. [9] 张玉莲, 闫天增.内梅罗指数法在土壤重金属污染评价中的应用[J].河南教育学院学报:自然科学版, 2012, 21(2):35-39. http://www.cnki.com.cn/Article/CJFDTOTAL-HLKB201202012.htm [10] 李良忠, 杨彦, 蔡慧敏, 等.太湖流域某农业活动区农田土壤重金属污染的风险评价[J].中国环境科学, 2013, 33(S1):60-65. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGHJ2013S1012.htm [11] 林海鹏, 武晓燕, 战景明, 等.兰州市某城区冬夏季大气颗粒物及重金属的污染特征[J].中国环境科学, 2012, 32(5):810-815. http://www.cnki.com.cn/Article/CJFDTOTAL-ZGHJ201205009.htm [12] 熊俊, 王飞, 梅朋森, 等.三峡库区香溪河消落区土壤重金属生态风险评价[J].环境科学研究, 2011, 24(11):1318-1324. http://www.cnki.com.cn/Article/CJFDTOTAL-HJKX201111018.htm [13] 车飞, 于云江, 胡成, 等.沈抚灌区土壤重金属污染健康风险初步评价[J].农业环境科学学报, 2009, 28(7):1439-1443. http://www.cnki.com.cn/Article/CJFDTOTAL-NHBH200907023.htm [14] USEPA. Exposure factors handbook[J]. Office of Research and Development, Washington, 1997:104-126. https://www2.epa.gov/sites/production/files/2015-09/documents/efh-chapter07.pdf [15] SINGH A, SHARMA R K, AGRAWAL M, et al. Health risk assessment of heavy metals via dietary intake of foodstuffs from the wastewater irrigated site of a dry tropical area of India[J]. Food and Chemical Toxicology, 2010, 48(2):611-619. doi: 10.1016/j.fct.2009.11.041 [16] BINBIN Y, YU W, QIXING Z. Human health risk assessment based on toxicity characteristic leaching procedure and simple bioaccessibility extraction test of toxic metals in urban street dust of Tianjin, China[J]. Plos One, 9(3):e92459. doi: 10.1371/journal.pone.0092459. [17] 丁怡欣, 李柳.汞矿冶炼区土壤重金属汞污染健康风险评价[J].城市地理, 2015, (8):184-186. http://www.cnki.com.cn/Article/CJFDTOTAL-CSDI201508142.htm [18] 谷蕾, 仝致琦, 宋博.基于不同通车时间的路旁土壤重金属健康风险:以连霍高速郑州-商丘段为例[J].环境科学, 2012, 33(10):3577-3584. http://www.cnki.com.cn/Article/CJFDTOTAL-HJKZ201210044.htm [19] 段文佳. 水产品中甲醛的暴露评估与风险管理研究[D]. 青岛: 中国海洋大学, 2011: 42-47. [20] 陈振金, 陈春秀, 刘用清, 等.福建省土壤环境背景值研究[J].环境科学, 1992, 13(4):70-75. http://www.cnki.com.cn/Article/CJFDTOTAL-HJKZ199204019.htm [21] 刘庚, 牛俊杰, 张朝, 等.某铅酸蓄电池污染场地表层土壤重金属Pb空间分布预测研究[J].环境科学, 2014, (12):4712-4719. http://www.cnki.com.cn/Article/CJFDTOTAL-HJKZ201412044.htm [22] GRAY J E, PRIBIL M J, VAN METRE P C, et al. Identification of contamination in a lake sediment core using Hg and Pb isotopic compositions, Lake Ballinger, Washington, USA[J]. Applied Geochemistry, 2013, 29:1-12. doi: 10.1016/j.apgeochem.2012.12.001 [23] 宁晓波, 项文化, 方晰, 等.贵阳花溪区石灰土林地土壤重金属含量特征及其污染评价[J].生态学报, 2009, 29(4):2169-2177. http://www.cnki.com.cn/Article/CJFDTOTAL-STXB200904068.htm [24] 张菊, 陈诗越, 邓焕广, 等.山东省部分水岸带土壤重金属含量及污染评价[J].生态学报, 2012, 32(10):3144-3153. http://www.cnki.com.cn/Article/CJFDTOTAL-STXB201210021.htm [25] 陈涛, 常庆瑞, 刘京, 等.长期污灌农田土壤重金属污染及潜在环境风险评价[J].农业环境科学学报, 2012, 31(11):2152-2159. http://www.cnki.com.cn/Article/CJFDTOTAL-NHBH201211016.htm [26] 袁鹏, 李文秀, 彭剑峰, 等.国内外累积性环境风险评估研究进展[J].环境工程技术学报, 2015, 5(5):393-400. http://www.cnki.com.cn/Article/CJFDTOTAL-HKWZ201505008.htm -
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