| 海河流域中南部河流沉积物的重金属生态风险评价 |
| 摘要点击 2453 全文点击 1249 投稿时间：2014-03-17 修订日期：2014-04-29 |
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| 中文关键词 海河流域 沉积物 重金属 生态风险 污染来源 |
| 英文关键词 Haihe River Basin sediments heavy metals ecological risk source of contamination |
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| 中文摘要 |
| 针对海河流域中南部河流，布设80个采样点，对沉积物中Cu、Zn、Cr、Ni、Pb、Cd进行含量及空间分布研究，并采用潜在生态风险指数法和富集因子法进行重金属风险评价和污染来源判断. 结果表明：①除Cr、Ni外其余4种重金属元素均有较明显的积累，其中Cd含量超出环境背景值2.64倍. 基于单项重金属的潜在生态风险指数，Cd在多数点位风险强度等级为强，其余元素多数为轻微等级，各重金属生态风险等级排序为Cd>Cu>Pb>Ni>Cr>Zn；②重金属污染具有一定的空间差异性，位于平原的子牙河、大清河重金属含量较高，且综合生态风险指数平均值较高（RI为155.64和111.84）；徒骇马颊河和黑龙港河由于工业化程度较低重金属含量相对较低，且综合生态风险指数平均值也较低（RI为69.54和84.50）；③同源分析表明Cd、Pb、Zn、Cr有相似的污染来源；富集因子法评估显示人为影响依次为Ni |
| 英文摘要 |
| Several heavy metals, including Cu, Zn, Cr, Ni, Pb, and Cd, were investigated at 80 sampling sites in the southern and central areas of Haihe River Basin. The spatial patterns and potential anthropogenic impacts of heavy metals were evaluated by several methods, such as the potential ecological risk index and enrichment factors (EFs).Results showed that, ① The concentrations of heavy metals in the sediments were higher than the background values in most sites except for Cr, Ni. The concentration of Cd was 2.64 times higher than its background value. Based on the potential ecological risk index for single heavy metal, Cd in river sediments showed a high potential ecological risk while the other elements showed a slight potential ecological risk at most sampling sites. Generally, the decreasing order of the heavy metals was Cd>Cu>Pb>Ni>Cr>Zn. ② The concentration of heavy metals in surface sediment varied in different regions.The concentration of heavy metals and the potential ecological risks were higher in the Ziya river (RI=155.64) and Daqing river (RI=111.84) than those in the other rivers. For example, slight pollution of heavy metals was found in the Tuhai, Majia river (RI=69.54) and Heilonggang river (RI=84.50) due to a relatively low level of industrialization. ③ Cd,Pb,Zn,Cr were positively correlated with each other and might be derived from similar sources. The increasing order of anthropogenic impacts on heavy metals was Ni |
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