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Dynamic simulation experimental device for researching mercury shape in anoxic/anaerobic sediment

A dynamic simulation test and sediment technology, applied to sampling devices, material inspection products, metal testing, etc., can solve the problem of inability to realize the circulation of sediment leachate to the overlying water, the inability to simulate anoxic or anaerobic state, and the lack of field in-situ Problems with collection devices, etc.

Inactive Publication Date: 2019-01-11
GUANGDONG INST OF ANALYSIS CHINA NAT ANALYTICAL CENT GUANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, although the existing interstitial water collection device can realize the collection of interstitial water, there are still many defects and deficiencies: 1) it is mostly used indoors, and lacks a field in-situ collection device; 2) the in-situ environment will be damaged during the collection process. 3) Anoxic or anaerobic state cannot be simulated indoors; 4) Simulation of sediment leachate circulation to overlying water cannot be realized indoors

Method used

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  • Dynamic simulation experimental device for researching mercury shape in anoxic/anaerobic sediment
  • Dynamic simulation experimental device for researching mercury shape in anoxic/anaerobic sediment
  • Dynamic simulation experimental device for researching mercury shape in anoxic/anaerobic sediment

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Such as Figure 1~5As shown, a dynamic simulation test device for studying mercury forms in anoxic / anaerobic sediments includes a columnar sediment column collection tube 1, a funnel-type base 10, a gap water sampler 9, and a sediment columnar collection tube 1 and The locking device of the funnel base 10. The sediments retrieved from the environment are put into the columnar sediment collection pipe 1 to maintain the original characteristics of the water-soil interface. The nut interface 8 on the columnar sediment collection pipe 1 wall is used for fixing image 3 The gap water sampler 9 shown is convenient for loading and unloading of the gap water sampler. When sampling, remove the base, top cover and gap water sampler. After the sample is collected, install the funnel base 10, top cover 5 and gap water collector 9. The column body 1 and the funnel base 10 are used Figure 4 The locking device shown is secured. During operation, the interstitial water sampler 9 i...

Embodiment 2

[0034] Experimental setup for studying the form of mercury in interstitial water

[0035] In this example, the sediments were collected from Zhelin Bay Mariculture Area, and the concentration of inorganic mercury added was 500 μg L -1 The self-prepared seawater solution was sampled after 3 days of equilibration, and two parts of interstitial water were collected with an interstitial water sampler, one part was directly measured, and the other part was measured after microwave digestion. The testing instrument was RA-915+ Zeeman atomic absorption spectrometer. The mercury content in upper track water and interstitial water is shown in Table 2 below.

[0036] Table 2 Existing forms of mercury in interstitial water

[0037]

[0038] Use other existing methods to detect the deposits in the present embodiment 1 and embodiment 2, the mercury form distribution of each layer of the deposit obtained and the data error in table 1 are no more than 8%, and the mercury content in the i...

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Abstract

The invention discloses a dynamic simulation experimental device for researching mercury shape in an anoxic / anaerobic sediment. The device comprises a sediment collecting pipe, a top cover arranged onthe upper part of the sediment collecting pipe and a funnel type base arranged at the bottom of the sediment collecting pipe. One end of the funnel type base is a quartz partition plate which is connected to the bottom of the sediment collecting pipe, while the other end of the funnel type base is provided with a piston; a communicating pipe is arranged between the lower part of the funnel type base and the upper part of the top cover; a three-way valve is arranged between the communicating pipe and the piston; a circulating pump is arranged on the communicating pipe; and a gap water collector is arranged on one side of the sediment collecting pipe. The device can collect the gap water simply and flexibly in situ. The gap water of the sediment as a mercury metal dissolved state part is asensitive index reflecting change of the sediment. The device can sample and monitor mercury in gap water continuously and observe change of the mercury shape along with environmental conditions.

Description

Technical field: [0001] The invention specifically relates to a dynamic simulation experiment device for studying mercury forms in anoxic / anaerobic sediments. Background technique: [0002] Mercury in the water / sediment environment is mainly inorganic mercury (Hg 2+ , HgO, HgS, etc.) and organic mercury (mainly methylmercury, ethylmercury) compounds, the current general view is that low pH, low dissolved oxygen, high water temperature, and high organic matter content will promote the formation of inorganic mercury in water. Methylation produces highly toxic methylmercury. At the same time, the occurrence form of mercury metal in sediments affects its mobility and toxicity hazards. The chemical extraction method usually divides the occurrence forms of heavy metals (including Hg) in sediments into weak acid extraction state, reduced state, organic matter-bound state, sulfide-bound state, and residual state. Among them, the weak acid extraction state is easy to migrate and b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/20G01N1/14
CPCG01N1/14G01N33/20
Inventor 郭鹏然宋玉梅刘爽梁维新
Owner GUANGDONG INST OF ANALYSIS CHINA NAT ANALYTICAL CENT GUANGZHOU
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