| 摘要: |
| 于2023年11月采集新疆博斯腾湖湿地22个沉积物样品，测定As、Cd、Cr、Cu、Hg、Ni、Pb和Zn等8种重金属元素的含量，采用地累积指数（Igeo）、富集因子（EF）、和潜在生态风险指数（RI）、Monte Carlo模拟和人体健康风险评价模型分别对沉积物重金属污染、潜在生态风险程度和人体健康风险进行评估。结果表明：（1）博斯腾湖湿地沉积物Zn、Cd、Cr、Pb和Hg含量平均值分别是新疆土壤背景值的1.01倍、3.58倍、1.32倍、1.94倍和1.53倍。（2）.地累积指数与富集因子评价结果均表明，沉积物重金属污染程度为：Cd＞Pb＞Hg＞Cr＞Zn＞Cu＞Ni＞As。（3）重金属元素单项生态风险指数平均值从大到小依次为Cd＞Hg＞Pb＞Cu＞Ni＞Cr＞As＞Zn。综合生态风险指数平均值为184.07，处于中等生态风险态势。（4）研究区域的沉积物中重金属污染会对不同人群的健康造成危害，存在非致癌风险和不可接受的致癌风险；成年男性、女性和儿童面临的非致癌风险概率分别为21.24%、23.50%和36.27%，Cr和Cd是主要的非致癌风险物质；成年男性、女性和儿童遭受不可接受的癌症暴露风险的概率分别为2.76%、7.74%和10.50%，其主要的致癌风险物质是As和Cr。 |
| 关键词: Monte Carlo模拟、重金属、沉积物、博斯腾湖湿地、风险评价 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学(42361006),国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| Characterization and risk assessment of heavy metal pollution in wetland sediments of Bosten Lake |
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Kai Wang, Dilinuer·Aji, Pingping Li, Congqiao Hu, Qingqing Peng, JiaJia Kang
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College of Geoscience and Tourism, Xinjiang Normal University
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| Abstract: |
| In November 2023, 22 sediment samples were collected from the wetland of Bosten Lake in Xinjiang, and the contents of 8 heavy metals including As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn were determined. Geo-accumulation Index, Enrichment Factor, Potential Ecological Risk Index, Monte Carlo simulation, and human health risk assessment model were used to assess the pollution, potential ecological risk, and human health risk of the heavy metals in the sediments. The results show that: (1) The average contents of Zn, Cd, Cr, Pb, and Hg in the wetland sediments of Bosten Lake were 1.01, 3.58, 1.32, 1.94, and 1.53 times of the background values of Xinjiang soil, respectively. (2) Both Geo-accumulation Index and Enrichment Factor evaluations show that the pollution degree of heavy metals in the sediments was: Cd > Pb > Hg > Cr > Zn > Cu > Ni > As. (3) The order of average values of single ecological risk index of heavy metal elements from large to small was: Cd > Hg > Pb > Cu > Ni > Cr > As > Zn. The average value of the comprehensive ecological risk index was 184.07, which was in a medium ecological risk situation. (4) The heavy metal pollution in the sediments of the research area will pose health risks to different populations, including non-carcinogenic risks and unacceptable carcinogenic risks. The probabilities of non-carcinogenic risks for adult men, women, and children were 21.24%, 23.50%, and 36.27%, respectively, with Cr and Cd being the main non-carcinogenic risk substances. The probabilities of unacceptable cancer exposure risks for adult men, women, and children were 2.76%, 7.74%, and 10.50%, respectively, with the main carcinogenic risk substances being As and Cr. |
| Key words: Monte Carlo simulation heavy metal sediment Bosten Lake wetland risk assessment |
