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| 赣州市南部地区土壤有害元素空间分布及健康风险评价 |
| Spatial distribution and health risk assessment of toxic elements in the soils of southern Ganzhou City |
| 投稿时间：2021-02-04 |
| DOI：10.13254/j.jare.2021.0084 |
| 中文关键词: 土壤有害元素，地统计模拟，健康风险评价，赣州市，生态脆弱区 |
| 英文关键词: soil toxic metals, geostatistical simulation, health risk assessment, Ganzhou City, ecologically fragile area |
| 基金项目:中国地质调查局项目（DD20190540） |
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| 中文摘要: |
| 土壤有害元素污染具有严重的环境危害和风险。本研究以生态脆弱区——江西省赣州市于都县和赣县南部为研究区域，系统采集表层土壤样品230个并测定Hg、As、Cu、Ni、Pb、Cr、Cd、Zn 8种有害元素的含量，基于最小/最大自相关因子分析（MAF）和序贯高斯模拟（SGS）构建多元地统计模拟模型，分析土壤有害元素空间分布规律，并运用改进的人体健康风险指数模型评估了儿童和成人致癌风险及非致癌风险程度。结果表明：除Ni、Zn外，土壤中其余6种元素含量均超过江西省土壤背景值，但所有元素的平均值均低于《土壤环境质量农用地土壤污染风险管控标准（试行）》中土壤风险筛选值。8种有害元素基本呈岛状分布格局，As、Cr这2种元素的高值区基本上分布在铁山垄镇、王母渡镇。人体健康风险评价结果显示，除了As的儿童非致癌风险指数（HI）大于规定的阈值1外，儿童和成人非致癌风险指数均小于1，总致癌风险指数（TCR）均介于10-6~10-4之间，说明土壤有害元素污染导致的两类健康风险处于可接受范围。 |
| 英文摘要: |
| Pollution owing to toxic elements in soil poses serious environmental hazards and risks. In this study, 230 topsoil samples were collected from Yudu County and southern Ganxian County, which are ecologically fragile areas. The content of Hg, As, Cu, Ni, Pb, Cr, Cd, and Zn in soil was analyzed. Based on the minimum/maximum autocorrelation factor analysis and sequential Gaussian simulation, the multivariate geostatistical simulation technique was utilized to analyze the spatial distribution of toxic elements in soil. The human health risk index model was developed to assess the carcinogenic and noncarcinogenic risks for children and adults. The results showed that except for Ni and Zn, the content of the other six elements was higher than the background values of soil in Jiangxi Province; however, the average values of all elements were lower than the soil risk screening values defined in the Soil Environmental Quality Standards for Soil Pollution Risk Control in Agricultural Land(Trial). The island pattern of distribution was observed in eight toxic elements, and the high value areas of As, and Cr, were mainly distributed in Tieshanlong, and Wangmudu towns. The results of human health risk assessment showed that except for the As noncarcinogenic hazard index(HI) for children being greater than the specified threshold of 1, the other element noncarcinogenic HI in both children and adults was less than 1. The total carcinogenic risk index was between 10-6 and 10-4. This indicates that the two types of health risks caused by soil toxic element pollution are of acceptable levels. |
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