| 长江流域安庆市耕地土壤重金属污染特征、潜在生态风险及来源 |
| 摘要点击 322 全文点击 24 投稿时间：2024-05-14 修订日期：2024-07-15 |
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| 中文关键词 长江流域 土壤 重金属 污染特征 生态风险 来源 |
| 英文关键词 Yangtze River Basin soil heavy metals pollution characteristics ecological risks sources |
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| 中文摘要 |
| 为探究长江流域耕地土壤重金属污染状况、潜在生态风险及来源,选择安庆市周边区域为研究对象,采集了222件表层样品,分析了土壤中的As、Cd、Cr、Cu、Hg、Ni、Pb和Zn这8种重金属元素以及测定土壤pH值,综合利用污染指数法、地累积指数法和潜在生态风险指数法等评价了重金属的污染特征及生态风险,基于APCS-MLR受体模型进行了溯源分析.结果表明,研究区土壤以酸性为主,土壤重金属ω（Cd）、ω（Hg）、ω（As）、ω（Pb）、ω（Cr）、ω（Cu）、ω（Ni）和ω（Zn）平均值分别为：0.20、0.13、8.18、32.52、71.24、30.44、33.38和100.84 mg·kg-1,除As外,其余元素含量均高于江淮流域背景值；Cd和Hg这两种重金属是研究区的主要污染特征因子,Hg绝大部分处于轻微污染-轻微污染至中度污染,Cd少量样品处于轻微污染水平,潜在生态风险评价表明研究区大多处于中等污染水平.Cr和Ni主要来源于自然源,Cd、As和Pb主要来源于农业源,Hg、Cu和Zn主要来源于工业源,自然源、农业源、工业源和未知源对研究区土壤重金属的贡献率分别为28.15%、36.07%、12.90%和22.80%.研究结果可为该区土壤污染防治措施提供数据支撑. |
| 英文摘要 |
| To investigate the status of heavy metal pollution, potential ecological risks, and sources in the arable soil of the Yangtze River Basin, the surrounding area of Anqing city was selected as the research site. A total of 222 surface soil samples were collected, and the concentrations of eight heavy metals—arsenic （As）, cadmium （Cd）, chromium （Cr）, copper （Cu）, mercury （Hg）, nickel （Ni）, lead （Pb）, and zinc （Zn）—along with soil pH values were analyzed. The pollution characteristics and ecological risks of heavy metals were evaluated using methods, such as the pollution index, geo-accumulation index, and potential ecological risk index. Source apportionment was conducted using the APCS-MLR receptor model. The results indicated that the soils in the study area were primarily acidic. The average concentrations of ω（Cd）, ω（Hg）, ω（As）, ω（Pb）, ω（Cr）, ω（Cu）, ω（Ni）, and ω（Zn） were 0.20, 0.13, 8.18, 32.52, 71.24, 30.44, 33.38, and 100.84 mg·kg-1, respectively. Except for As, the concentrations of the other elements were all higher than the background values of the Jianghuai Basin. Cd and Hg were identified as the main pollution characteristic factors in the study area, with Hg mostly ranging from slight to moderate pollution and a few samples of Cd at a slight pollution level. The potential ecological risk assessment showed that the area was mostly at a moderate pollution level. Cr and Ni were primarily derived from natural sources； Cd, As, and Pb mainly from agricultural sources； and Hg, Cu, and Zn predominantly from industrial sources. The contributions of natural sources, agricultural sources, industrial sources, and unknown sources to soil heavy metal pollution in the study area were 28.15%, 36.07%, 12.90%, and 22.80%, respectively. The findings provide data support for soil pollution prevention and control measures in the region. |
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