In order to understand the status of soil heavy metal pollution and its impact on human health, the degree of soil heavy metal pollution in the changchun new Area and the associated ecological risk and health risk were evaluated using the geo-accumulation index method, potential ecological risk index method, and health risk assessment model. the results showed that the average contents of eight heavy metals in the soil were higher than their background values in changchun city, with different degrees of accumulation. the soil of changchun new Area showed Hg and cd pollution, with ecological risks. The average geo-accumulation index of Hg was 0.43, reflecting light to medium pollution, and the risk index ranged from 42 to 806, reflecting moderate to strong ecological risk. The level of Cd pollution was found to be light. In contrast, the soil was free of cr, ni, Pb, Zn, As, and cu pollution, with no apparent risk. However, they all exceeded the reference value of soil treatment proposed by the United States Environmental Protection Agency (10 -6 ). therefore, prevention measures for heavy metal pollution should be further strengthened.

In order to understand the status of soil heavy metals and risk element pollution and its impact on human health, Datong area of Shanxi Province was selected as the study area. Using spss19 statistical software, the degree of soil heavy metals and risk element pollution, ecological risk and health risk were evaluated by using land accumulation index method, potential ecological hazard index method and health risk assessment model. The results showed that there were different degrees of pollution of heavy metals and risk element Pb, Cr, Zn, Cd, Ni, As, Hg and Cu in farmland soil in Datong area. The soil Pb pollution was the most serious. There were 8 light pollution points, 3 medium pollution points, 1 heavy~extremely heavy pollution point and 1 extremely heavy pollution point, accounting for 3.24%, 1.21%, 0.4% and 0.4% respectively. The distribution range of the total potential ecological index RI of heavy metals and risk element in farmland soil is 28.00~1851.01. There are slight, secondary, strong, very strong and extremely strong ecological risks, accounting for 97.57%, 1.21%, 0.4%, 0.4% and 0.4% respectively. The main risk factors are slight risks, and the influencing factors are Cd, Pb, Cu, Hg and As. Heavy metals and risk element in farmland soil have non-carcinogenic health risks for adults and children. Cr and As are the main non-carcinogenic factors in the soil of the study area; The average value of the total carcinogenic risk index is between 10 -6 and 10 -4 , which will not cause great harm to the health of local residents.

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In order to study the pollution, ecological risk and health risk of heavy metals and risk elements in the surface farmland of the cold black soil area in Northeast China, the main grain production area in China, based on the collection and analysis of samples in 2010 and 2021, the soil heavy metals and risk element in this area were assessed by using the method of Geo accumulation index (Igeo), potential ecological hazard index (RI) and health risk assessment (HRA) model. The results show that there are heavy metals and risk element pollution in the soil, which is accumulated year by year. The average contents of Hg, Cd, Cr, Ni, Pb, Zn, As and Cu in the soil in this area are higher than the background values of Qianjin town. The heavy metals and risk element in the black soil and farmland in the cold area are obviously affected by human activities. There are different degrees of regional variability, and the coefficient of variation of Hg is 79%; Some elements have ecological risk, and Hg and Cd are the main influencing elements of soil ecological risk in shallow farmland; Heavy metals and risk element have non-carcinogenic health risks to children. The carcinogenic risk index of adults and children exceeded the soil treatment benchmark value of 10 -6 proposed by EPA, As is the element that contributes the most to non-carcinogenic health risk and carcinogenic health risk in adults and children. In view of the continuous accumulation of heavy metals and risk element in farmland soil, it is necessary to improve ideological understanding, improve laws and regulations, formulate norms

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