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Method and device for water-sediment interface in-situ sampling and fixing

A sediment and interface technology, applied in the field of water environment research, can solve the problems of uncertainty in the depth of the collected sediment column and secondary sampling, and achieve the effects of reducing low-efficiency freezing, avoiding disturbance, and difficult to change the structure

Inactive Publication Date: 2014-09-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

This sampling method has the following problems: the depth of the collected sedimentary column is uncertain, the interface structure will be affected during transportation, it is difficult to re-sample the collected samples without disturbance, and it is impossible to pass subsequent X-ray computed tomography, Scanning electron microscope analysis technique to obtain the undisturbed sediment interface structure

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  • Method and device for water-sediment interface in-situ sampling and fixing
  • Method and device for water-sediment interface in-situ sampling and fixing
  • Method and device for water-sediment interface in-situ sampling and fixing

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Embodiment Construction

[0012] The design of the sampling tube of the deposition column: the iron tube (6) is nested with the heat-insulating plastic tube (4) to ensure the airtightness of the freezing chamber, and the liquid nitrogen input hole (2) is set at the lower end of the heat-insulating plastic tube (4), and the upper end Set the nitrogen discharge hole (3) to ensure the airtightness of the pipeline in the liquid nitrogen freezing system.

[0013] Assemble the sampling device: open the sampling tube locking lever (8), insert the sedimentation column sampling tube (1) into the self-gravity sedimentation column sampling bracket, close the sampling tube locking lever (8), squeeze the silicone ring (10 ), fix the sedimentation column sampling tube (1). Connect the liquid nitrogen input pipe of the self-pressurized liquid nitrogen tank to the liquid nitrogen input hole (2) of the deposition column sampling tube (1), and connect the spring check valve to the nitrogen gas discharge hole of the depo...

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Abstract

The invention discloses a method and a device for water-sediment interface in-situ sampling and fixing. The device is supported by a self-gravity sediment column sampling support and comprises a sediment column sampling pipe and a liquid nitrogen refrigeration system. The sediment column sampling pipe comprises an inner sampling pipe and an outer liquid-nitrogen refrigeration chamber, and the liquid-nitrogen refrigeration chamber, a liquid-nitrogen input pipe, a unidirectional nitrogen discharge valve, and a self-pressurization-type liquid nitrogen tank form the liquid nitrogen refrigeration system. The sediment column sampling pipe is put into the self-gravity sediment column sampling support and is connected to the liquid nitrogen refrigeration system, when the water-sediment interface enters into the refrigeration chamber of the sampling pipe, the self-pressurization-type liquid nitrogen tank is started and fixes a sediment column, after the sediment column is fixed, the sampler is taken out of water surface, lake water is added into the refrigeration chamber, the solid sediment column slips out of the sampling pipe, and the sediment column is subjected to refrigeration preservation and transport. The method prevents deposit structure disturbance in sampling and transport adopting the conventional method and is convenient for secondary sampling analysis.

Description

technical field [0001] The invention belongs to the field of water environment research, and relates to a sediment sampling method, in particular to a sampling method and a device for in-situ sampling and fixing the water-sediment interface. Background technique [0002] The water-sediment interface pores of rivers and lakes serve as channels for material exchange between sediments and overlying water bodies, and their structural characteristics such as pore size, connectivity, and tortuosity greatly affect the material diffusion flux at the water-sediment interface. The biogeochemical cycle of pollutants is of great significance. The water-sediment interface is very susceptible to disturbance during sampling and transport. The self-gravity columnar sampling tube method is a method that can less disturb the sediment among the existing sediment sampling methods, and the collected sediment column is transported to the laboratory for subsequent processing. This sampling metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/10
Inventor 单保庆温胜芳孔学红张洪唐文忠
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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