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

SHI Yang; SUN Yu-chuan; XU Xin; REN Kun; Md.Jahangir Alam

Volume 33 Issue 2

Jun. 2014

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SHI Yang, SUN Yu-chuan, XU Xin, REN Kun, Md.Jahangir Alam. Distribution of OCPs in underground water and surface sediment of underground river in Chongqing’s Laolongdong[J]. CARSOLOGICA SINICA, 2014, 33(2): 238-247.

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SHI Yang, SUN Yu-chuan, XU Xin, REN Kun, Md.Jahangir Alam. Distribution of OCPs in underground water and surface sediment of underground river in Chongqing’s Laolongdong[J]. CARSOLOGICA SINICA, 2014, 33(2): 238-247.

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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

Received Date: 2013-11-09
Publish Date: 2014-06-25

Abstract

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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References(27)

References

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

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