Analysis on monitoring results of heavy metals in rural soils in Bole of Xinjiang, 2017-2019 / 公共卫生与预防医学

ABSTRACT

Objective To monitor heavy metals Pb, Cd, Cr, As, and Hg in agricultural land in Bole of Xinjiang, in order to understand the overall pollution status of rural soil environment and determine the environmental health hazards in rural areas of Bozhou, Xinjiang. Methods From 2017 to 2019, 4 administrative villages in 5 townships in Bole City in Bozhou Region were selected as monitoring points. The 5 to 20 cm deep topsoil of monitoring points was collected for a total of 60 samples. According to "Environmental Quality Standard for Soils" (GB 15618-2018), the pollution levels of Pb, Cd, Cr, As and Hg were evaluated by single index method and Nemerow index method. Results The content of Pb, Cr, As, and Hg in the heavy metals in the soil of Bozhou region from 2017 to 2019 were all lower than the screening value and regulatory value of soil pollution risk for agricultural land, while the content of heavy metal Cd in 13 soil samples (21.67%) exceeded the standard. The content difference in Pb, Cd, Cr, and As was statistically significant (P0.05). The single pollution index Pi of Pb, Cr, As and Hg was less than 1, indicating a non-pollution state. However, the single pollution index Pi of Cd from 2017 to 2018 was higher than 1, with the highest value reaching 2.33. In 2017 and 2018, the comprehensive pollution index of rural soil samples was 1.67 and 1.06, and the evaluation result was light pollution, while in 2019, the comprehensive pollution index was 0.72, and the evaluation result was still clean. Conclusion The overall quality of rural environmental soil in some rural areas in Bozhou, Xinjiang was generally acceptable, but the heavy metal Cd pollution in some aeras deserves attention.