| 引用本文: | 李世龙,赵增锋,邱小琮.宁夏清水河流域重金属分布特征及风险评价[J].灌溉排水学报,0,():-. |
| lishilong,zhaozengfeng,qiuxiaocong.宁夏清水河流域重金属分布特征及风险评价[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 为探明宁夏清水河重金属分布特征和污染情况，于2018年4月、7月和11月对清水河流域32个采样点的水体和表层沉积物中砷（As）、铬（Cr）、汞（Hg）和铅（Pb）的含量进行监测，采用主成分法和聚类分析法解析重金属污染来源，采用内梅罗综合指数法评价水体重金属污染情况，采用潜在生态风险指数评价表层沉积物重金属污染情况。结果表明：清水河水体As、Pb、Hg的年平均含量分别为3.68、0.37、0.23 ug/L，没有超过地表水Ⅳ类标准，Cr年平均含量为69.27 ug/L，超过地表水Ⅳ类标准，且4种重金属浓度整体变化为11月份＞4月份＞7月份。表层沉积物中As、Cr、Pb的年平均含量分别为标准值的68.2%、46.3%、39.9%，均低于土壤背景值，Hg的年平均含量为一级标准值的1.3倍，超过土壤背景值，4种重金属浓度整体变化为11月份＞4月份＞7月份。内梅罗综合指数法评价清水河流域水体4种重金属污染程度依次为Cr＞Hg＞As＞Pb，Cr为最主要污染重金属。潜在生态风险指数法评价清水河流域表层沉积物4种重金属风险程度依次为Hg＞As＞Pb＞Cr，Hg是最主要的生态风险因子。主成分和聚类分析法都将水体和沉积物重金属分为3类，水体中As、Hg、Cr主要受人为控制因素，Pb主要受自然地质因素。沉积物中As、Cr、Pb主要受自然地质因素，Hg主要受人为控制因素。 |
| 关键词: 清水河；重金属；分布特征；风险评价 |
| DOI： |
| 分类号:X824 |
| 基金项目:宁夏高等学校一流学科建设(水利工程)资助项目(NXYLXK2017A03)。 |
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| Distribution Characteristics and Risk Assessment of Heavy Metals in Qingshui River Basin of Ningxia |
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lishilong1, zhaozengfeng1, qiuxiaocong2
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1.School of Civil and Hydraulic Engineering;2.School of Life Science，Ningxia University
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| Abstract: |
| Arsenic (As), chromium (Cr), mercury (Hg) and lead (Pb) in water and surface sediments at 32 sampling sites in QingShui River basin were monitored in April, July and November 2018 to explore the distribution characteristics and pollution of heavy metals there. Principal component method and cluster analysis method were used to analyze the source of heavy metal pollution.The Memero comprehensive index were used to evaluate the Heavy metal pollution in water. Evaluate the heavy metal pollution of surface sediments by the potential ecological risk index. The results indicated that the annual average contents of As, Pb, and Hg in Qingshui River water were 3.68, 0.37, and 0.23 ug / L, respectively, which did not exceed surface water category IV. The annual average content of Cr was 69.27 ug / L, which exceed the surface water class IV standard. And the four heavy metal concentrations decreased in the order of November＞April＞July. The annual average contents of As, Cr, and Pb in surface sediments were 68.2%, 46.3%, and 39.9% of the standard values, which were all lower than the soil background values. The annual average content of Hg was 1.3 times the soil background value, which exceeded the soil background value. And the four heavy metal concentrations decreased in the order of November＞April＞July. The degree of heavy metal contamination in the water of QingShui River decreased in the following order with the method of Nemerow comprehensive pollution index Cr＞Hg＞As＞Pb, Cr was the main pollution heavy metal. Potential Ecological Risk Index Method for Evaluating the Risk of Four Heavy Metals in Surface Sediments of Qingshui River Basin in Order: Hg＞As＞Pb＞Cr, Hg was the main ecological risk factor. Both principal component and cluster analysis methods classified water and sediment heavy metals into three categories. As, Hg, and Cr in water were mainly controlled by human factors, and Pb was mainly affected by natural geological factors. As, Cr, and Pb in the sediment were mainly affected by natural geological factors, and Hg was mainly controlled by human factors. |
| Key words: Qingshui;River, Heavy;Metal, Distribution;Characteristics, Risk;Assessment |
