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Mercury enrichment material in water sample and method for measuring mercury by headspace enrichment

A technology for enrichment and water sampling, applied in the field of detection, can solve the problems affecting the adsorption efficiency, adsorption consistency and blockage of the enrichment process, and achieve the effect of improving adsorption efficiency and adsorption consistency, accurate detection and good reproducibility.

Active Publication Date: 2021-02-05
INSTITUTE OF ANALYSIS GUANGDONG ACADEMY OF SCIENCES (CHINA NATIONAL ANALYTICAL CENTER GUANGZHOU)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the enrichment process, the formation of gold amalgam (absorption efficiency and absorption capacity) is usually directly related to the amount, thickness and contact area of ​​Au. Due to the uncertainty of the distribution state of gold-plated quartz sand in the quartz tube, the resulting Changes in gas flow rate and flow will affect the adsorption efficiency and consistency of the enrichment process, and even blockage in severe cases

Method used

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  • Mercury enrichment material in water sample and method for measuring mercury by headspace enrichment
  • Mercury enrichment material in water sample and method for measuring mercury by headspace enrichment
  • Mercury enrichment material in water sample and method for measuring mercury by headspace enrichment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of mercury enrichment material in water samples: prepare 100mL 2nM HAuCl with high-purity water 4 solution and 100mL 0.16M NaBH 4 solution. Take some clean glass fiber filter paper with a diameter of 5 cm, and soak the glass fiber filter paper in HAuCl 4 solution and NaBH 4 Soak in the solution and continue to soak for 10 minutes, take it out, and drain the solution. NaBH 4 Glass fiber filter paper soaked in solution with HAuCl 4 The glass fiber filter paper soaked in the solution was stacked together and placed in a ventilated and dry place to dry naturally. After the glass fiber filter paper is completely dry, separate the stacked glass fiber filter paper and put it in HAuCl 4 The glass fiber filter paper soaked in water was cut into several sizes of 1cm×2cm, washed and dried to obtain mercury-enriched material (its microstructure is as follows: figure 1 ); used directly for headspace enrichment of mercury in water samples.

[0027] Headspace enric...

Embodiment 2

[0031] Preparation of mercury enrichment materials in water samples: take clean glass fiber filter paper and cut it into several 1cm×2cm sizes for use, prepare 20mL 20nM HAuCl with high-purity water 4 solution and 20 mL of 0.03M NaBH 4 solution. Soak the cut glass fiber filter paper in HAuCl 4 solution and NaBH 4 Soak in the solution and continue to soak for 3 minutes, take it out, and drain the solution. NaBH 4 Glass fiber filter paper soaked in solution with HAuCl 4 The glass fiber filter paper soaked in the solution was stacked together, and the stacked glass fiber filter paper was separated after being blown dry by nitrogen, and taken in HAuCl 4 The immersion gold glass fiber filter paper soaked in water was washed and dried to obtain the mercury-enriched material for use.

[0032] Headspace enrichment detection method: add 1mL mercury standard aqueous solution or the actual water sample to be tested in a 10mL headspace vial, then add 3mL 0.52M SnCl 2solution; fix t...

Embodiment 3

[0036] Preparation of mercury-enriched materials in water samples: take clean glass fiber filter paper and cut it into several 1cm×2cm sizes for use, prepare 30mL 2nM HAuCl with high-purity water 4 solution and 30 mL of 0.16M NaBH 4 solution. Soak the cut glass fiber filter paper in HAuCl 4 solution and NaBH 4 Soak in the solution and continue to soak for about 8 minutes, take it out, and drain the solution. NaBH 4 Glass fiber filter paper soaked in solution with HAuCl 4 The glass fiber filter paper soaked in the solution was stacked together, and the stacked glass fiber filter paper was separated after being blown dry by nitrogen, and taken in HAuCl 4 The immersion gold glass fiber filter paper soaked in water was washed and dried to obtain the mercury-enriched material for use.

[0037] Headspace enrichment detection method: add 1mL mercury standard aqueous solution or the actual water sample to be tested in a 10mL headspace vial, then add 2mL 0.52M SnCl 2 solution; f...

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Abstract

The invention discloses a mercury enriched material in a water sample and a method for measuring mercury through headspace enrichment. A glass fiber raw paper in-situ-deposited Au nanoparticle is taken as the mercury enriching material, and the mercury enriching material is used for determining the content of mercury in an environmental water sample, and the use amount of Au and the contact area of Hg steam are determined by virtue of the mercury enriching material, so that the adsorption efficiency and adsorption consistency of Hg is improved, a result has very good reproducibility, stabilityand accuracy in the determination, the mercury enriching material is low in cost, simple in process, high in detection speed, flexible in design and can be applied to the rapid and accurate field detection of mercury in surface water, underground water and industrial wastewater.

Description

Technical field: [0001] The invention relates to the technical field of detection, in particular to a mercury enrichment material in a water sample and a method for measuring mercury by headspace enrichment. Background technique: [0002] As one of the persistent pollutants in the environment, heavy metal mercury (Hg) can bioaccumulate in the environment and enter the human body through the food chain, causing serious harm to human health. The problem of Hg pollution has been widely concerned all over the world and the governments of various countries attach great importance to it. my country has signed the "Minamata Convention on Mercury", and since 2020, the production, import and export of Hg-containing products will be prohibited. Enrichment methods based on biology, chemistry, piezoelectricity, and nanomaterials have been widely studied in the enrichment and sensing of Hg, but the most widely used in practice is the chemical adsorption of Au and Hg, which releases Hg a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
CPCG01N21/3103G01N2021/3111
Inventor 郭鹏然雷永乾管鹏刘宁马旭
Owner INSTITUTE OF ANALYSIS GUANGDONG ACADEMY OF SCIENCES (CHINA NATIONAL ANALYTICAL CENTER GUANGZHOU)
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