重庆老龙洞地下河不同部位水体、表层沉积物有机氯农药含量及组成研究

师 阳; 孙玉川; 徐 昕; 任 坤; Md.Jahangir Alam

重庆老龙洞地下河不同部位水体、表层沉积物有机氯农药含量及组成研究

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

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

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出版历程
- 收稿日期: 2013-11-09
- 发布日期: 2014-06-25

Distribution of OCPs in underground water and surface sediment of underground river in Chongqing’s Laolongdong

School of Geographical Sciences, Southwest University/Key Laboratory of Eco-environments in Three Gorges Reservoir, Ministry of Education；Field Scientific Observation & Research Base of Karst Eco-environments at Nanchuan in Chongqing, MLR；Key Laboratory of Karst Dynamics, MLR & GZAR

摘要

摘要: 为研究重庆老龙洞地下河不同部位水体、表层沉积物有机氯农药分布特征，用气相色谱-微池电子捕获检测器(GC-μECD)分析了样品中OCPs含量。结果表明：研究区水样、表层沉积物中OCPs检出率均为100 %，其浓度在时间上存在季节差异，水体中OCPs、DDTs、HCHs含量丰水期小于枯水期，而在表层沉积物中则表现为OCPs、HCHs丰水期大于枯水期，DDTs丰水期小于枯水期;在空间上则表现为水体中有机氯农药总体下游大于上游，而沉积物中则与之相反。通过对比可知，岩溶洞穴环境由于缺乏光照，空气流动缓慢，生物活动不频繁，使水体中的HCHs不易降解，沉积物中的HCHs不易重新释放而浓度高于洞外。枯水期由于洞内流速较小且变幅不大，水体中的DDTs大量沉积因而其浓度低于洞口，而丰水期洞口因受大量雨水的稀释作用DDTs反而低于洞内的含量；洞内沉积物中的DDTs则因洞内环境恒定不易重新释放和枯水期水体中的大量沉积而一直高于洞外。洞穴环境、不同污水汇入对水体中DDTs和表层沉积物中DDTs、HCHs的组成结构均有不同程度的影响，而对水体中HCHs的组成结构影响不大。此外，地下河不同部位污染源的输入对有机氯污染物的组成结构也有影响。与国内外水体及表层沉积物中HCHs、DDTs相比较，研究区水体、表层沉积物中HCHs、DDTs浓度分别处于中等和偏高水平。
- 有机氯农药 /
- 地下河水 /
- 表层沉积物 /
- 老龙洞地下河 /
- 重庆
Abstract: In order to study the spatial and temporal distribution of OCPs in surface sediments and different parts of the underground river in Chongqing’s Laolongdong, the concentrations of OCPs residues in water samples were measured with a gas chromatograph equipped with a miro-63Ni electron capture detector. The results showed that the detection rates of OCPs in the water samples and surface sediment in the research area were 100 %. The concentrations of OCPs have obvious seasonal differences. The concentrations of OCPs, DDTs, HCHs in the water are higher during the dry season are than in the rainy season. The OCPs, HCHs concentrations in the surface sediments are higher during the rainy season than in the dry season, but DDTs are higher in the dry season. The concentrations of OCPs in the water are higher downstream than upstream. In contrast, the concentrations of OCPs in the surface sediments are higher upstream than downstream. Due to the lack of sunlight, slow air flow, and less frequent biological activity in the karst cave, the HCHs in the water do not degrade easily, and the difficult release of HCHs from the surface sediment makes their concentrations higher in the cave than outside. In the dry season, under the stable cave conditions the high deposition of DDTs makes DDTs concentrations in water lower underground than at the cave entrance; but during the wet season, dilution due to large amounts of rain makes the DDTs concentrations in water lower at the cave entrance than inside the cave. Under stable cave conditions, it is difficult to release DDTs from cave sediments, and they are largely deposited during the dry season, making DDTs concentrations higher in sediments inside the cave than those outside. The cave environment and different pollution sources (including farmland, factories, etc.)impact the structure of DDTs in water and DDTs, HCHs in surface sediments, but they have little influence on the structure of HCHs in water. In addition, the nature of the pollution sources in different parts of the underground river is connected to the structure of the organochlorine pollutants. Compared with other areas of the world, the concentration of HCHs, DDTs in water and surface sediment of the research area are moderate and high respectively.
- organochlorine pesticides /
- water of underground river /
- surface sediment /
- Laolongdong subterranean river /
- Chongqing

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