| .于桥水库上游支流沉积物重金属含量及生态风险评价[J].农业环境科学学报,2013,32(6):. |
| 于桥水库上游支流沉积物重金属含量及生态风险评价 |
| Concentrations and Ecological Risk Assessment of Heavy Metals in Surface Sediments from Tributaries of Yuqiao Reservoir |
| |
| DOI：10.11654/jaes.2013.06.018 |
| 中文关键词: 沉积物 重金属污染 生态风险评价 来源 于桥水库 |
| 英文关键词: sediments heavy metal pollution ecological risk assessment source Yuqiao Reservoir tributaries |
| 基金项目: |
|
|
| 摘要点击次数: 2158 |
| 全文下载次数: 1871 |
| 中文摘要: |
| 于桥水库是引滦入津工程重要调蓄水库,也是天津市居民生活饮用水的水源地。分析了于桥水库上游支流沉积物中Cr、Ni、Cu、Zn、Cd、Pb 6种重金属含量及分布特征，通过Hakanson生态危害指数法评价沉积物中重金属的潜在生态风险。结果表明：于桥水库上游河流表层沉积物中Ni、Cu、Zn、Cd污染超标，高值区大致均在2号和6号位点，其中Cd超标最明显。于桥水库上游三条河流中沙河重金属污染最严重，其潜在生态风险最大。由潜在生态风险系数可知，Cd为潜在生态风险最大的重金属元素，Cu、Pb次之。各样点重金属的潜在生态风险指数表明，于桥水库上游支流各样点大部分处于轻微潜在生态危害，八户庄下游为中等生态风险，遵化市上游为强生态风险，遵化市下游为很强生态风险，其中Cd在各样点的潜在生态风险指数中贡献最大。Zn-Cd同源性较强，重金属矿区的分布特征及河道的自然特征是造成于桥水库重金属污染的主要原因。 |
| 英文摘要: |
| Yuqiao Reservoir, an important adjusting reservoir in the project of diverting water from the Luanhe River to Tianjin City, is important water resource for Tianjin City. The potential ecological risk of heavy metals were assessed by using Hankanson ecological risk index methods and the sources of heavy metal contamination were estimated with correlation analysis after the sediments samples from three tributaries of Yuqiao reservoir were collected and the concentrations of heavy metals such as cadmium（Cd）, lead（Pb）, chromium（Cr）, copper（Cu）, zinc（Zn）, manganese（Mn） and nickel（Ni） were analyzed by ICP-MS. The results showed that sediments of three tributaries of Yuqiao reservoir are uncontaminated by Cr, Pb, lightly contaminated by Ni, Cu, Zn, moderately contaminated by Cd. The Hankanson’s ecological risk factor of Cd averagely was 106.78, meaning the highest level ecological risk. The ecological risk of Shahe River in three tributaries was at highest level. The total potential ecological risks of heavy metals in sediments were at low level assessed by potential ecological risk index. The ecological risk of Bahuzhuang sampling site of Shahe River was at medium level ecological risk, the sampling site near Zunhua city was at the intensity level and the Xiliucun sampling site was at high intensity level. There was better correlation between Zn and Cd with correlation analysis. The resource of heavy metals pollutants of three tributaries of Yuqiao Reservoir may be controlled by mining area distribution and riverway shape. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
