| 香河县农田土壤重金属污染生态与健康风险评价 |
| 摘要点击 1723 全文点击 535 投稿时间：2022-02-17 修订日期：2022-04-11 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 土壤重金属污染 生态风险评价 健康风险评价 香河县 农田土壤 |
| 英文关键词 soil heavy metal pollution ecological risk assessment health risk assessment Xianghe County farmland soil |
|
| 中文摘要 |
| 为系统研究河北省香河县农用地土壤重金属污染状况，网格法采集了288个点位的表层（0~20 cm）土壤样品，分析土壤样品中Cd、Cr、Hg、Ni、Pb、As、Cu和Zn这8种土壤重金属的分布特征，并采用单因子指数、内梅罗综合污染指数、地累积指数、潜在生态风险指数和人体健康风险指数评估其污染状况、生态风险和健康风险.结果表明：①香河县土壤重金属含量均低于筛选值，但存在较强的空间变异；富集因子分析表明有20.74%的Hg和0.33%的Cd呈显著污染，68.56%的Hg和20.40%的Cd呈中污染，其余重金属处于无~弱污染水平.②内梅罗综合污染指数超标率为8.68%，主要以点状分布在香河县西部与中部.③地累积指数评价表明土壤Cd、Pb和Zn污染相对严重，Hg污染最严重，达到中度污染及以上的点位占比为46.50%.④潜在生态风险指数表明土壤以中等和强潜在生态风险为主，占比分别为46.15%和37.46%，有1.34%点位达到极强潜在生态风险等级，达到中等及以上潜在风险程度的重金属为Cd和Hg.⑤土壤重金属健康风险较低，经任何暴露途径产生的非致癌风险大体均可以接受.相对而言，土壤Cr、As和Pb是各乡镇非致癌风险最大的3个贡献因子，土壤As是各乡镇主要的致癌风险因子.土壤重金属对儿童引起的健康风险高于成人，食物摄取为主要暴露途径.建议香河县针对各乡镇产业布局和土壤重金属含量、生态和健康风险差异，采取对应措施加强防控. |
| 英文摘要 |
| In order to systematically study the soil heavy metal pollution of agricultural land in Xianghe County, Hebei province, 288 surface (0-20 cm) soil samples were collected using the grid method. The distribution characteristics of Cd, Cr, Hg, Ni, Pb, As, Cu, and Zn in soil samples were analyzed, and the single factor index, Newerow comprehensive pollution index, geo-accumulation index, potential ecological risk index, and human health risk index were used to evaluate their pollution status, ecological risk, and health risk. The results showed that:① the contents of heavy metals in Xianghe County soil were all lower than the screening values, but there was a strong spatial variation. Enrichment factor analysis showed that 20.74% of Hg and 0.33% of Cd were significantly polluted, 68.56% of Hg and 20.40% of Cd were moderately polluted, and the other heavy metals were at the level of no or weak pollution. ② The over-standard rate of the Newerow comprehensive pollution index was 8.68%, which was mainly distributed in the western and central parts of Xianghe County. ③ The geo-accumulation index evaluation showed that the soil Cd, Pb, and Zn pollution was relatively serious, Hg pollution was the most serious, and the sites with moderate pollution and above accounted for 46.50%. ④According to the potential ecological risk index, the soil was dominated by medium and strong potential ecological risk, accounting for 46.15% and 37.46%, respectively, with 1.34% of the heavy metals reaching the level of extremely strong potential ecological risk. The heavy metals that reached the level of medium and above were Cd and Hg. ⑤ The health risks of soil heavy metals were low, and the non-carcinogenic risks from any exposure route were generally acceptable. Soil Cr, As, and Pb were the three biggest contributing factors to the non-carcinogenic risk in each township, and As in the soil was the main carcinogenic risk factor in each township. The health risk caused by heavy metals in soil was higher for children than for adults, and exposure through food intake was the main exposure route. This suggested that Xianghe County should take corresponding measures to strengthen prevention and control according to the differences in industrial distribution, soil heavy metal content, and ecological and health risks among townships and towns. |
|
|
|
