| 株洲市农田土壤重金属生物可给性及其人体健康风险评估 |
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| 引用本文： | 李继宁,侯 红,魏 源,许亚飞,李发生. 株洲市农田土壤重金属生物可给性及其人体健康风险评估[J]. 环境科学研究, 2013, 26(10): 1139-1146 |
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| 作者姓名： | 李继宁 侯 红 魏 源 许亚飞 李发生 |
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| 作者单位： | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 |
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| 基金项目： | 国家自然科学基金项目(41271338)；国家环境保护公益性行业科研专项(201009032)；国家重大科学仪器设备开发专项(2011YQ14014908) |
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| 摘 要： | 在我国湖南株洲市采集42个农田土壤样品,利用SBET(simple bioavailability extraction test)方法研究土壤中重金属生物可给性,探讨了其与土壤理化性质之间的关系,并采用目前常用的人体健康风险评估方法,评估了该地区土壤重金属经口腔摄入后对人体的健康风险. 结果表明:研究区土壤中Cr、Cu、Zn、As、Cd和Pb总量(以w计)分别为101~407、22.9~139、64.0~2286、5.80~137、0.310~26.4和17.9~691mg/kg,生物可给量(以w计)分别为3.80~38.1、1.96~106、5.06~1516、0.160~53.6、0.140~21.3和10.8~570mg/kg. 不同重金属的生物可给性差异很大,生物可给性平均值为Cd(66.0%)>Pb(59.0%)>Cu(44.9%)>Zn(35.8%)>As(16.9%)>Cr(5.72%). 采用统计学上的显著模型,可通过土壤重金属总量、pH、w(OM)(OM为有机质)和w(TC)(TC为全碳)较好地预测该地区土壤重金属的生物可给量. 儿童的HI(总非致癌风险)和TCR(总致癌风险)均高于成人,HI和TCR平均值分别约为成人的8.0和1.5倍. 用土壤重金属总量评估经口摄入途径的风险高估了实际的人体健康风险,用重金属生物可给性进行调整后风险显著降低,HI和TCR平均值分别降低了71%和74%. 但用生物可给性进行调整后仍有部分采样点的HI或TCR超过风险阈值,需要引起特别关注.
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| 关 键 词： | 农田土壤 重金属 生物可给性 经口摄入 人体健康风险评估 |
| 收稿时间： | 2013-05-14 |
| 修稿时间： | 2013-07-28 |
Bioaccessibility and Health Risk Assessment of Heavy Metals in Agricultural Soil from Zhuzhou, China |
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| LI Ji-ning,HOU hong,WEI Yuan,XU Ya-fei and LI Fa-sheng. Bioaccessibility and Health Risk Assessment of Heavy Metals in Agricultural Soil from Zhuzhou, China[J]. Research of Environmental Sciences, 2013, 26(10): 1139-1146 |
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| Authors: | LI Ji-ning HOU hong WEI Yuan XU Ya-fei LI Fa-sheng |
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| Affiliation: | Chinese Research Academy of Environmental Sciences, State Key Laboratory of Environmental Criteria and Risk Assessment, Beijing 100012, China |
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| Abstract: | Forty two agricultural soil samples were collected from Zhuzhou of Hunan province, China. The samples were analyzed to study the heavy metal bioaccessibility using SBET method, and to discuss their relationship with soil properties. In addition, the health risk assessment of the oral ingestion soil was carried out based on the common-used methods. The results showed that the concentrations of Cr, Cu, Zn, As, Cd and Pb in soils were 101-407,2.9-139,4.0-2286,5.80-137,0.310-26.4and 17.9-691mg/kg, respectively, while the bioaccessible concentrations of these metals were 3.80-38.1,1.96-106,5.06-1516,0.160-53.6,0.140-21.3and 10.8-570mg/kg, respectively. The results showed a wide range of bioaccessibility of soil heavy metals. The rate of bioaccessibility of heavy metals were generally decreased as the order of Cd (66.0%) >Pb (59.0%) > Cu (44.9%) > Zn (35.8%) >As (16.9%) > Cr (5.72%). The bioaccessible heavy metals were well predicted by statistical models based on pseudototal contents, pH, organic matters and the total carbon. The health risk of soil heavy metals to children was obviously higher than that to adults. The average HI and TCR values of heavy metals to children were 8.0times and 1.5times higher than those to adults, respectively. Results based on the total metal contents might overestimate the actual human health risks in comparison with oral bioaccessibility assessment could reduce the risk significantly. After adjustment by bioaccessibility, the average HI and TCR values were reduced 71% and 74%, respectively. In contrast, the HI and TCR of some samples were still higher than the risk thresholds after adjustment by bioaccessibility and deserved our special attention. |
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| Keywords: | agricultural soil heavy metals bioaccessibility oral ingestion human health risk assessment |
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