| 基于特定源-风险评估模型的兰州黄河风情线绿地土壤重金属污染优先控制源分析 |
| 摘要点击 521 全文点击 92 投稿时间：2023-04-19 修订日期：2023-06-26 |
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| 中文关键词 重金属 APCS-MLR模型 源解析 生态风险 健康风险 |
| 英文关键词 heavy metals APCS-MLR model source apportionment ecological risk health risk |
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| 中文摘要 |
| 为甄别城市滨河公园景区绿地土壤重金属污染优先控制因子和污染源,以兰州市黄河风情线大景区为研究区,采集并测定64个绿地土壤样品重金属As、Cd、Cr、Cu、Hg、Ni、Pb和Zn的含量；采用单因子污染指数法和污染负荷指数法量化重金属污染程度,利用绝对因子得分-多元线性回归（APCS-MLR）模型对绿地土壤重金属进行源解析.并运用APCS-MLR模型与综合生态风险指数和人体健康风险评价模型相耦合方法,解析各污染源对生态风险和人体健康风险的贡献率.结果表明,除Cr和Ni之外,As、Cd、Cu、Hg、Pb和Zn的含量均值高于兰州市土壤元素背景值,但所有元素含量均低于《土壤环境质量建设用地土壤污染风险管控标准》（GB 36600-2018）的筛选值.单因子污染指数结果显示,As、Cd、Cr、Cu、Ni、Pb和Zn为无污染至轻微污染水平,而Hg属于轻度污染.污染负荷指数评价结果显示,绿地土壤总体上属于轻度污染水平.源解析表明,绿地土壤重金属源自于交通源、自然-农业源和自然-工业源,贡献率分别为34.79%、23.12%和18.49%.特定源-综合生态风险指数结果表明,Cd和Hg为生态风险优先控制元素,自然-工业源为优先控制污染源；特定源-健康风险评价模型分析结果表明,As和Ni为人体健康优先控制元素,自然-农业源为优先控制污染源. |
| 英文摘要 |
| In order to identify the priority control factors and pollution sources for heavy metal contamination in greenspace soil from urban riverfront park areas, the Yellow River Custom Tourist Line in Lanzhou was selected as the research area. Sixty-four soil samples were collected and analyzed for the concentrations of As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn. The single-factor pollution index and pollution load index were applied to assess heavy metal pollution. Then, the absolute principal component score-multiple linear regression （APCS-MLR） model was used for source apportionment of heavy metals in greenspace soils. Finally, source-specific ecological and human health risks were quantified by combining the APCS-MLR model and comprehensive ecological risk index, as well as the human health risk assessment model. The results showed that all the average values for As, Cd, Cu, Hg, Pb, and Zn concentrations, except for those of Cr and Ni, were higher than their soil background values in Lanzhou City, but all heavy metal contents were lower than the risk screening value for the Soil Environment Quality Risk Control Standard for Soil Contamination of Development Land （GB 36600-2018）. The results of the single-factor pollution index revealed that As, Cd, Cr, Cu, Ni, Pb, and Zn were at levels of no contamination to low contamination, whereas Hg presented moderate contamination. The results of the pollution load index demonstrated that the overall level of heavy metal pollution in greenspace soils was mild. Source apportionment indicated that heavy metals in greenspace soils primarily originated from traffic sources, natural-agricultural sources, and natural- industrial sources, with contribution rates of 34.79%, 23.12%, and 18.49%, respectively. Source-specific ecological risk analysis showed that Cd and Hg were the priority control elements for ecological risk, and natural- industrial sources were identified as the priority sources for ecological risk. Source-specific human health risk analysis showed that As and Ni were the priority control elements for human health, and natural-agricultural sources were identified as the priority source for health risks in the study region. |
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