重庆老龙洞地下河间隙水重金属污染及毒性评估

任 坤; 杨平恒; 杜 伟; 师 阳; 任小凤; 李晓春

重庆老龙洞地下河间隙水重金属污染及毒性评估

1.
西南大学地理科学学院/三峡库区生态环境教育部重点实验室；国土资源部岩溶生态环境-重庆南川野外基地；国土资源部、广西壮族自治区岩溶动力学重点实验室
2.
重庆市北碚区国土和房屋资源管理分局
3.
西南大学地理科学学院/三峡库区生态环境教育部重点实验室；国土资源部岩溶生态环境-重庆南川野外基地
4.
西北大学资源与环境学院

基金项目: 重庆市基础与前沿研究计划院士专项项目（cstc2013jcyjys20001）；国家自然科学基金项目(41103068)；2011年度重庆市国土房管局科技计划项目；中央高校基本科研业务费专项资金（XDJK2014A016）；岩溶动力学重点实验室开放基金资助课题（KDL2012-08）

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出版历程
- 收稿日期: 2013-11-26
- 发布日期: 2014-06-25

Heavy metal pollution and toxicity assessment of interstitial water from Laolongdong subterranean river, Chongqing

1.
School of Geographical Science, Southwest University / Key Laboratory of Eco-environments in Three Gorges Reservoir, Ministry of Education；Field of Scientific Observation & Research Base of Karst Eco-environments at Nanchuan in Chongqing, MLR；Key Laboratory of Karst Dynamics,MLR & GZAR
2.
The Branch Bureau of Land and Resources Management of Beibei
3.
School of Geographical Science, Southwest University / Key Laboratory of Eco-environments in Three Gorges Reservoir, Ministry of Education；Field of Scientific Observation & Research Base of Karst Eco-environments at Nanchuan in Chongqing, MLR
4.
College of Resources and Environment, Northwest University

摘要

摘要: 为查明重庆岩溶地区老龙洞地下河重金属污染情况，于2013年9月采集了地下河上覆水体和表层沉积物间隙水共7组水样，用ICP-OES测定地下河上覆水体和表层沉积物间隙水中的Mn含量，ICP-MS测定Cu、Cd、Cr、As和Pb含量，分析了老龙洞地下河表层沉积物间隙水中各重金属元素的空间分布，对不同介质中的重金属元素进行相关性分析，并参考美国EPA推荐的“国家推荐水质标准”对间隙水中重金属可能产生的生物毒性进行评估。结果表明：老龙洞地下河上覆水体中Mn和Pb的浓度超过了GB 5749-2006规定的生活饮用水限值（Mn≤100 ug/L，Pb≤10 ug/L），不可作为饮用水源；间隙水中各重金属元素的浓度都比上覆水体高，有向上覆水体扩散的潜在可能性。除Pb、Mn外，间隙水中重金属的含量大小依次为上游>中游>下游。上覆水中除Mn与As、Cd与Cr外，其他金属元素之间的相关性不大；间隙水中Cr、Cu、As和Cd的相关系数分别为0.895～0.997，呈高度正相关。间隙水中金属元素除As不会对水生生态系统产生急性毒性外，Cr、Cu、Cd和Pb都会对水生生态系统产生急性毒性，尤以Cr、Cu、Cd最为严重。
- 重金属污染 /
- 间隙水 /
- 毒性评估 /
- 老龙洞地下河 /
- 重庆
Abstract: With increasing urbanization and industrialization, karst subterranean river systems, an important source of drinking water in karst areas, have suffered from various degrees of pollution. Samples of overlying water and interstitial water from surface sediments were collected at the seven sampling sites along the Laolongdong subterranean river in Chongqing karst area during September 2013. Mn concentrations were measured by ICP-OES, and Cu, Cd, Cr, As and Pb were measured by ICP-MS, in order to determine the heavy metal pollution status. The spatial distribution of the heavy metals in the interstitial water and the relationships between metals in different media were studied. Meanwhile, the biological toxicity of the metals in interstitial water was assessed according to the National Recommended Water Quality Criteria released by the EPA. The results showed that the overlying water of Laolongdong subterranean river is not suitable for drinking, as the Mn and Pb levels were higher than limits (Mn≤100 ug/L, Pb≤10 ug/L) established by GB 5749-2006. The concentrations of metals in the interstitial water samples were higher than those in the overlying water samples. This phenomenon probably indicates that the heavy metals may be released from the interstitial water into the overlying water. The concentrations of the studied metals (with the exception of Mn and Pb) in interstitial water decreased from upstream to midstream to downstream locations. Although statistical analysis suggested that there were no significant correlations between the concentrations of these metals occurring in overlying water, with the exception of Mn and As, as well as Cd and Cr, high correlations were found between Cu, Cd, Cr and As in interstitial water. Toxicity assessment of the interstitial water showed that Pb and especially Cr, Cu and Cd, pose acute toxicity to the aquatic ecosystem. However, As does not pose acute toxicity to the aquatic ecosystem.
- heavy metals pollution /
- interstitial water /
- toxicity assessment /
- Laolongdong subterranean river /
- Chongqing

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