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摘要
Heavy metals in fine particulate matter（PM2.5）pose a threat to human health and the ecological environment. According to the different pollution control measures taken by Xinxiang City during the 2022 Beijing Winter Olympics，PM2.5 was sampled hourly at a rural station in Xinxiang from January 20 to February 20，2022，and the concentrations of 20 types of heavy metal elements were detected. The characteristics of heavy metals pollution in rural area of Xinxiang at different control periods（pre-control period P1，strict control period P2，loose control period P3）and their relationship with control measures were studied. Research shows that during the strict control period，the concentrations of Zn，Pb，Mn，As，Se，Hg，Cr，and Ni significantly decreased by 50.2%，29.3%，39.1%，67.9%，33.4%，27.7%，51.9%，and 32.2%，respectively. Among them，the pollution level（Igeo）of As and Cr significantly decreased by 34.3% and 27.8%，respectively，and the Igeo of other elements only slightly decreased or did not decrease. During the loose control period，the concentrations and Igeo of Mn，Cr and Ni significantly increased，with concentrations increasing by 49.8%，26.3%，and 17.4%，respectively，and Igeo increasing by 27.9%，21.1%，and 22.5%，respectively. The daily variation analysis shows that under strict control measures，the daily variation characteristics of K，Ca，Pb，and As were different from other time periods，while there was no significant difference in other elements. In addition，during the strict control period，the effect of meteorological conditions on the measured elements was also different from other time periods，and the performance was more complex. The potential ecological risk level of heavy metals in rural area of Xinxiang was extremely high（ecological risk index > 1200），with the highest risk elements being Cd，Se，Pb，As（ecological risk index：64 ~ 12714）. The four elements with high pollution levels and potential ecological risks were Cd，As，Pb，and Se. The concentration weighted trajectory （CWT）results show that the main potential source area of Cd was in the central and southern part of Shandong Province，while the potential source areas of the other three elements were concentrated in the southeastern part of Hebei Province，and there were certain differences in the potential source areas at different periods. ? 2024 Science Press.
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