| 山美水库沉积物重金属污染状况及风险评价 |
| |
| 引用本文： | 张文慧,许秋瑾,胡小贞,耿荣妹,邱祖凯,姚程.山美水库沉积物重金属污染状况及风险评价[J].环境科学研究,2016,29(7):1006-1013. |
| |
| 作者姓名： | 张文慧 许秋瑾 胡小贞 耿荣妹 邱祖凯 姚程 |
| |
| 作者单位： | 1.中国环境科学研究院, 北京 100012 |
| |
| 基金项目： | 国家水体污染控制与治理科技重大专项(2014ZX07510-001) |
| |
| 摘 要： | 为了解泉州市山美水库沉积物重金属空间分布及污染水平,采用电离子耦合法(ICP-MS)测定了库区20个采样点不同分层的67个沉积物样品的w(As)、w(Zn)、w(Cd)、w(Pb)、w(Cu)、w(Cr),并采用地累积指数法和潜在生态危害指数法进行了库区重金属污染程度及生态风险的评价. 结果表明,Cd是山美水库最主要的重金属污染物,不同分区分层w(Cd)平均值为0.24~0.49 mg/kg,受人为活动影响较大.不同分区w(Cd)存在差异,污染层的Ⅰ区、Ⅱ区显著高于Ⅲ区(P<0.05). Pb和Cu虽有累积但污染情况较轻. 重金属污染来源主要为入库河流承接的沿程生活、工业及农业污染物,部分来源为周边村庄的生活及农业污染物. 地累积指数法评价结果显示,山美水库各重金属元素的平均污染程度由强到弱依次为Cd(轻度污染)>Cu(清洁)>Pb(清洁)>As(清洁)>Zn(清洁)>Cr(清洁). 潜在生态风险结果显示,6种元素中,Cd的生态风险为“强”,其他重金属则是低或无生态风险. 研究显示,在开展底泥疏浚工作中,疏浚深度的确定应综合考虑沉积物氮、磷及重金属污染状况,并需在底泥堆场采取防渗措施避免重金属对土壤及地下水产生二次污染.
|
| 关 键 词： | 山美水库 沉积物 重金属 污染分布 生态风险评价 |
| 收稿时间： | 2015/12/2 0:00:00 |
| 修稿时间： | 2016/3/25 0:00:00 |
Pollution and Potential Ecological Risks of Heavy Metals in Sediment of Shanmei Reservoir |
| |
| ZHANG Wenhui,XU Qiujin,HU Xiaozhen,GENG Rongmei,QIU Zukai and YAO Cheng.Pollution and Potential Ecological Risks of Heavy Metals in Sediment of Shanmei Reservoir[J].Research of Environmental Sciences,2016,29(7):1006-1013. |
| |
| Authors: | ZHANG Wenhui XU Qiujin HU Xiaozhen GENG Rongmei QIU Zukai and YAO Cheng |
| |
| Affiliation: | 1.Chinese Research Academy of Environmental Sciences, Beijing 100012, China2.Chinese Research Academy of Environmental Sciences, Beijing 100012, China ;School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China3.Chinese Research Academy of Environmental Sciences, Beijing 100012, China ;College of Environment, Nanjing University of Technology, Nanjing 210009, China |
| |
| Abstract: | A total of 67 samples from different layers (e.g., polluted layer, transition layer and normal layer) were taken from 20 regions in Shanmei Reservoir. The total contents of six heavy metals (As, Cd, Cr, Cu, Pb and Zn) were measured by ICP-MS, and the distribution and sources of the heavy metals in the reservoir were analyzed using comparative analysis and correlation analysis. The geoaccumulation index was used to evaluate the pollution levels of the heavy metals in Shanmei reservoir, and the potential ecological risks of the heavy metals in the sediment were further assessed. The results showed that:Cd, Cu and Pb accumulated in the sediment for decades. Cd was at the highest pollution level of the six heavy metals, and was strongly affected by artificial activity. The average contents of Cd in the different zones and layers ranged from 0.24 to 0.49 mg/kg. In the polluted layer, Cd contents in zones Ⅰ and Ⅱ were significantly higher than zone Ⅲ (P<0.05). The contents of Pb and Cu in the sediment were higher than the background value in Fujian, but the Pb and Cu contamination levels were much slighter compared to Cd. The heavy metals were mainly from the domestic, industrial and agricultural pollutants from the upstream zone, and some might be from the domestic and agricultural pollutants in surrounding villages. According to the geoaccumulation index, the rank of pollution level of the six heavy metals in Shanmei reservoir were:Cd (lightly polluted) > Cu (clean) > Pb (clean) > As (clean) > Zn (clean) > Cr (clean). Potential ecological risk results showed that Cd had a high ecological risk, while the other five heavy metals had a low ecological risk. Therefore, when taking dredged sediment decontamination technologies, the depth of dredged sediment should be determined by the pollution level of TN, TP and heavy metals, and anti-leakage and other measures should be taken to prevent heavy metal pollution. |
| |
| Keywords: | Shanmei Reservoir sediment heavy metals pollution distribution ecological risk assessment |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《环境科学研究》浏览原始摘要信息 |
|
点击此处可从《环境科学研究》下载全文 |
|
