以背景值作为参比值，各采样地土壤重金属潜在生态危害评价结果如表6所示，

Taking the background value as the reference value, the evaluation results of the potential ecological hazards of heavy metals in the soil of each sampling site are shown in Table 6. The evaluation results of the potential ecological hazards of single heavy metals and the Ei evaluation results of the six heavy metals in Zhoucun District are all low hazard levels. Ei is the largest for Cd, and it is much larger than other elements. The main reason is that the toxicity coefficient of Cd is 30, which is much larger than other heavy metal elements. The toxicity coefficient indirectly reflects the degree of harm to the environment and humans. According to the evaluation results of potential ecological hazards of multiple heavy metals, Zhoucun District has the smallest RI, Zichuan District has the largest RI, and Zhangdian District and Boshan District have similar RIs. The evaluation results are all medium-hazard grades, and the specific order is Zichuan District>Zhangdian District. District>Boshan District>Zhoucun District. The above results show that compared with the background value, the soil heavy metals in the study area already have a certain potential ecological hazard risk.

With background value as the reference value, the results of the evaluation of potential ecological hazards of heavy metals in soil at each sampling site are shown in Table 6, the evaluation results of the potential ecological hazards of single heavy metals, the Ei evaluation results of 6 kinds of heavy metals in Zhoucun District are all low hazard grade, and the Ei of each region is the largest cd, and much larger than other elements, the main reason is that Cd's toxicity coefficient is 30, far greater than several other heavy metals elements, toxicity coefficient indirectly reflects its degree of harm to the environment and human beings. A variety of heavy metals potential ecological hazard evaluation results, Zhoucun District RI is the smallest, Yuchuan District RI is the largest, Zhangdian District and Boshan RI close, the evaluation results are medium hazard level, the specific order is the > Zhangdian District of Yuchuan District> Boshan district> Zhoucun District. The above results show that there is a certain risk of potential ecological hazards in soil heavy metals in the study area compared with background values.

Taking the background value as the reference value, the potential ecological hazard assessment results of soil heavy metals in each sampling area are shown in Table 6. According to the potential ecological hazard assessment results of single heavy metal, the EI assessment results of six heavy metals in Zhoucun District are all of low hazard level, and the EI of each district is CD, which is the largest and far greater than other elements. The main reason is that the Toxicity Coefficient of CD is 30, The Toxicity Coefficient indirectly reflects its harm to the environment and human beings. The RI of Zhoucun District was the smallest, Zichuan District was the largest, and Zhangdian District was close to Boshan District. The evaluation results were all in the medium level, and the specific order was Zichuan District > Zhangdian District > Boshan District > Zhoucun District. The above results show that compared with the background value, there is a certain potential ecological risk of heavy metals in the soil of the study area.<br>