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Seafloor sediment large depth profile pore water long-term in-situ sampling and analysis method

A seabed sediment and analysis method technology, which is applied in the field of in-situ sampling and detection of seabed sediment pore water, can solve the problems of no in-situ, large error in experimental results, etc., and achieve the effect of reducing costs

Inactive Publication Date: 2019-10-29
GUANGZHOU MARINE GEOLOGICAL SURVEY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to: in order to solve the technical problem of large error in experimental results and non-in-situ, long-term, sub-period collection, detection and storage of deep-sea large-depth profile sediment pore water in the existing in-situ sampling detection technology of seabed sediment pore water, The invention provides a long-term in-situ sampling and analysis method for pore water in large depth profiles of seabed sediments

Method used

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  • Seafloor sediment large depth profile pore water long-term in-situ sampling and analysis method
  • Seafloor sediment large depth profile pore water long-term in-situ sampling and analysis method
  • Seafloor sediment large depth profile pore water long-term in-situ sampling and analysis method

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Embodiment 1

[0027]The long-term in-situ sampling and analysis method of pore water in the large depth profile of seabed sediments, including the collection method of pore water, the analysis method of pore water, the storage method of pore water, and the recovery method of pore water samples, the collection method of the pore water The method is to insert the pore water in-situ collection column 1 with a water storage cavity for storing pore water inside into the seabed sediments, and then open the pore water in-situ collection column 1 on the outer circle of the pore water in-situ collection column 1. The seepage hole connected by the water storage cavity, and a filter membrane that can only allow pore water to pass through is set at the seepage orifice on the outer circle of the pore water in-situ collection column 1, so that the pore water in the seabed sediments can flow from the The filter membrane penetrates into the water storage cavity; the analysis method of the pore water is to d...

Embodiment 2

[0029] To further optimize on the basis of Example 1, the pore water in-situ collection column 1 includes a plurality of pore water collection units 16 capable of collecting pore water, a connecting column 15 fixedly connected to the body 2, and a cone tip of a conical structure 17. A plurality of pore water collection units 16 capable of collecting pore water are arranged in sequence along the length direction of the pore water in-situ collection column 1. The pore water collection unit 16 is located between the connecting column 15 and the cone tip 17. The pore water is originally A pore water transmission pipeline 18 is provided in the situ collection column 1 to transport the pore water collected by each pore water collection unit 16 to the Raman spectroscopy in situ test unit 13 for detection.

[0030] The long-term in-situ sampling and analysis device for the large-depth profile pore water of the seabed sediment is put into place in such a way that the steel cable of the ...

Embodiment 3

[0032] like Figures 1 to 3 As shown, the present embodiment provides a long-term in-situ sampling and analysis method for pore water in large-depth profiles of seabed sediments, including a pore water in-situ collection column 1 capable of collecting pore water in seabed sediments at different depths, and also including The pore water collected by the pore water in-situ collection column 1 is subjected to in-situ detection and storage body 2, one end of the body 2 is fixedly connected to the pore water in-situ collection column 1, and the other end of the body 2 is provided with a Rotating cable reel 10, the cable on the cable reel 10 realizes the elongation and retraction of the cable by the rotation of the cable reel 10, the free end of the cable on the cable reel 10 is fixedly connected with a floating ball 8, and the body 2 is provided with A locking mechanism 6 that can limit the free rotation of the cable reel 10, a battery module 4 that can provide electrical energy fo...

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Abstract

The invention discloses a seafloor sediment large depth profile pore water long-term in-situ sampling and analysis method, and relates to the technical field of seafloor sediment pore water in-situ sampling and detection. The sampling and analysis method comprises a method for acquiring pore water, a method for analyzing pore water, a method for storing pore water, and a method for recycling a pore water sample, monitors the dynamic change of the pore water geochemical parameters in a seafloor sediment profile in situ for a long time, restores a sulfate-methane transition zone (SMTZ) depthchange interval in the sediments under a reduction methane leakage flux change, monitors a methane leakage intensity change, early warns a hydrate leakage risk, estimates a methane carbon cycle flux,and provides a technical support for hydrate environmental monitoring. The method can achieve the in-situ long-term monitoring of pore water in seafloor sediments up to 6 months to 1 year.

Description

technical field [0001] The invention relates to the technical field of in-situ sampling and detection of seabed sediment pore water, and more specifically relates to a long-term in-situ sampling and analysis method for seabed sediment large-depth profile pore water. Background technique [0002] Shallow sediment pore water geochemistry is a method that can trace gas hydrate in deep sediments, using SO2 in sediment pore water 4 2- , DIC, Ca 2+ and Mg 2+ The distribution characteristics of plasma on the sediment profile can estimate the seepage flux of methane in the sediment, and provide a cheap and effective way for the preliminary survey of gas hydrate in the sea area. [0003] Generally speaking, the geochemical analysis of sediment pore water is often realized by analyzing various components in pore water that can be used as markers, but the results obtained by sampling analysis are often inaccurate. Detection based on laser Raman spectroscopy The system has been succ...

Claims

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Application Information

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IPC IPC(8): G01N1/20G01N21/65
CPCG01N1/2035G01N21/65G01N2001/205
Inventor 叶建良梁前勇钟超陈静俞祖英董一飞徐著华陈道华荣一辚郭斌斌吴学敏杨林任明
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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