| 陈雪,汪小祥,邱杨,陈彪,景山.宁镇矿集区小流域水系沉积物重金属污染评价及来源解析[J].矿产勘查,2023,14(1):144-152 |
| 宁镇矿集区小流域水系沉积物重金属污染评价及来源解析 |
| Pollution assessment and source identification of heavy metals in the stream sediments of small watershed in the Ningzhen ore cluster area |
| 投稿时间：2021-12-23 |
| DOI：10.20008/j.kckc.202301017 |
| 中文关键词: 宁镇地区 重金属 生态风险 绝对主成分-多元线性回归模型 源解析 |
| 英文关键词: Ningzhen ore cluster area heavy metal ecological risk assessment absolute principal component-multiple linear regression (APCS-MLR) source identification |
| 基金项目:本文受江苏省地质勘查专项资金(苏财建〔2018〕96号、苏财资环〔2021〕46号)和江苏省有色金属华东地质勘查局基础研究专项资金项目(苏色华东地科〔2021〕146号)联合资助。 |
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| 中文摘要: |
| 为查明有过矿业活动史的水源地汇水区内水系沉积物的重金属含量特征、主要来源及其贡献率,本文以宁镇矿集区小流域表层水系沉积物为研究对象,在调查与采样测试基础上,采用潜在生态危害指数计算、相关性分析、主成分分析和绝对主成分—多元线性回归模型分析等方法,对表层水系沉积物重金属(Cr、Cu、Ni、As、Hg、Cd、Pb)的分布特征及潜在生态风险、污染来源及各来源贡献率进行研究。结果表明:研究区7种水系沉积物重金属变异系数为0.51~2.80,属中到强变异；除Hg外,其他6种元素均呈现富集现象,其中Cd、Cu累积明显；且因Cd、Cu的高累积而使部分采样点处于高—极高生态风险水平,但大部分采样点处于低生态风险。经源解析,研究区表层水系沉积物重金属主要有自然源、采矿活动源和农业源3个来源, 7种元素受几种源共同作用,其中自然源对As、Cr、Ni的贡献率分别为92.18%、87.48%、74.00%,采矿活动源对Cd、Cu的贡献率为63.54%、69.57%,而农业源对Pb、Hg的贡献率为50.41%和73%。研究成果能够为该水源地水系沉积物重金属针对性污染防治与修复工作提供一定的理论和数据依据。 |
| 英文摘要: |
| In order to ascertain the content characteristics, main sources and source identification of heavy metals in stream sediments in small watershed with a history of mining activities, this paper takes the Ningzhen ore cluster area as an example,on the basis of sampling and testing, to study the content characteristics, pollution sources and contribution rate of heavy metals(Cr,Cu,Ni,As,Hg,Cd and Pb)in top stream sediments by the Hakanson’s potential ecological risk index (Eiγ and RI) methods, correlation analysis, principal component analyses and the absolute principal component scores/multiple linear regression(APCS-MLR)receptor model. The results showed that the variation coefficients of 7 heavy metals in stream sediments were 0.51~2.80, belonging to medium to strong variation; except Hg, the concentrations of all elements were almost higher than the ecological risk values(1∶200000)and the deep soil background of Jiangsu Province, in which Cd and Cu were significantly enriched in the top stream sediments；and the potential ecological risk index of heavy metals belongs to the low potential ecological risk in the most of sampling points, while some of the stream sediments samples categorized as the high-risk level due to the high accumulation of Cd and Cu. Through source analysis, heavy metals in top stream sediments mainly come from three sources:natural source, mining activity source and agricultural source. Seven heavy metals are affected by several sources. The contribution of natural sources to As, Cr and Ni was 92.18%, 87.48% and 74.00%,respectively, the contribution of mining activity sources to Cd and Cu was 63.54% and 69.57%, respectively; While the agricultural sources contributed 50.41% and 73% to Pb and Hg, respectively. The research results can provide a certain theoretical and data basis for the prevention, control and remediation of heavy metal pollution in stream sediments in the water source area. |
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