漳州市长泰区农用地土壤重金属污染评价

    Evaluation on the Heavy Metal Pollution in the Soil of Agricultural Land in Changtai District

    • 摘要: 为明晰漳州市长泰区农用地土壤重金属污染情况,并对其进行风险评估,2020年在长泰区采集农用地土壤样品71个,测定土壤中Cd、Pb、Cr、Cu、Zn、Ni、As、Hg等8种重金属含量,运用单项污染指数法、内梅罗综合污染指数法、地积累指数法等方法对其污染水平进行风险评估。结果表明:71个监测区8种重金属元素的单项污染指数平均值均小于1,但有20个监测区存在某种重金属的单项污染指数大于1;内梅罗综合指数平均值为0.66,平均污染等级Ⅰ级,但有7个监测区污染等级达到Ⅲ级;地积累指数平均值为0.40,平均污染等级1级,但有66个监测区存在某种重金属的积累。总体来看,长泰区农用地土壤8种重金属含量均未高于标准规定的筛选值,部分监测区重金属含量已经超过污染风险筛选值,主要污染元素包括Cd、Pb、Hg,应及时采取积极有效的措施应对,避免影响农业生态和农产品质量安全。

       

      Abstract: In order to clarify the pollutionre situation of heavy metal in agricultural land in Changtai District of Zhangzhou City, and to assess its risk, 71 soil samples of agricultural land in Changtai District were collected to measure the contents of 8 heavy metals such as Cd, Pb, Cr, Cu, Zn, Ni, As and Hg in the soil in 2020. The risk assessment of pollution was carried out by using the methods of single pollution index, Nemerow comprehensive pollution index and geo-accumulation index. The results showed that the average single pollution index of 8 heavy metals in 71 monitoring areas was less than 1, but the single pollution index of some heavy metals was greater than 1 in 20 monitoring areas. The average Nemerow composite index was 0.66, and the average pollution degree was Ⅰ, but the pollution degree of 7 monitoring areas reached Ⅲ. The average geo-accumulation index was 0.40, and the average pollution degree was 1, but some heavy metals were accumulated in 66 monitoring areas. In general, the contents of 8 heavy metals in the soil of agricultural land in Changtai District were not higher than the screening values specified by the standard, and the contents of heavy metals in some monitoring areas have exceeded the screening value of soil pollution risk. The main pollution elements included Cd, Pb and Hg. Therefore, some active and effective countermeasures should be taken in time to avoid affecting the agricultural ecology and the quality and safety of agricultural products.

       

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