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Method for detecting air pollutants

A technology of air pollutants and detection methods, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of poor instrument accuracy, difficult readings, and inability to determine the degree of air pollution

Active Publication Date: 2017-06-27
江苏微谱检测技术有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] At present, in the process of air environment detection, air pollutant sampling has the greatest impact on the accuracy of detection data, while traditional sampling instruments mostly use rotameters or other mechanical principles, which have poor accuracy and difficult readings, and when sampling with load , the resistance increases, the sampling flow error can reach more than 50% at most, and it is impossible to determine the degree of air pollution

Method used

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  • Method for detecting air pollutants

Examples

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preparation example Construction

[0047] The preparation method of described sulfonated carbon nanotubes is as follows:

[0048] (1) Acidification of carbon nanotubes: Add concentrated sulfuric acid and sodium nitrate with a mass concentration of 98% in a dry reactor, cool in an ice-water bath, and add carbon nanotubes with stirring under the condition of 0-5°C, mix well and slowly add high Potassium manganate, control the reaction temperature at 10-15°C, react for 2h, continue to stir and react for 2h at 35°C, add deionized water, control the temperature of the reaction solution at 98°C, continue to stir for 0.5h, and then add a mass concentration of 30% hydrogen peroxide, filtered while hot, and the product was washed with dilute hydrochloric acid (1mol / L) to neutrality, and dried under reduced pressure at 60°C for 24 hours to obtain acidified carbon nanotubes; the acidified carbon nanotubes and the sodium nitrate , the weight ratio of the potassium permanganate is 1:0.5:4.2; the mass concentration of the ca...

Embodiment 1

[0082] The amount of pollutants added in the air sample was 0.1mg formaldehyde, 0.09mg xylene, 0.1mg ammonia, and 0.1mg styrene.

[0083] The preparation of described standard sample comprises the following steps

[0084] A. Sample pretreatment: Weigh 2.5g of the adsorption composition that does not adsorb odorous substances, put it into a metal grinding ball and mix evenly, add 70g of appropriate small steel balls, fix it in an oscillator and grind for 10min, and put the adsorption composition that has adsorbed odorous substances into a metal grinding ball. The substance was transferred to a 10mL glass column, eluted with 10mL methanol, and the eluate was collected in a 10mL centrifuge tube for use;

[0085] B. Purification of samples: add 200g of purifying agent LC-C18 to the sample eluent, shake well, centrifuge for 10 minutes to completely precipitate the purifying agent, transfer the supernatant into a clean centrifuge tube, blow it to dry with high-purity nitrogen, and t...

Embodiment 2

[0106] The amount of pollutants added in the air sample was 0.08mg formaldehyde, 0.06mg xylene, 0.08mg ammonia, and 0.1mg styrene.

[0107] The preparation method of the standard sample, the detection method of the air pollutant, the step (2), the GC test parameters in the GC-MS, the MS test parameters in the GC-MS, the adsorption composition The preparation method and the preparation method of the sulfonated carbon nanotubes are the same as in Example 1.

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Abstract

The invention provides a method for detecting air pollutants. The method includes steps of (1), sucking air samples by air pumps and collecting the air samples by the aid of adsorption compositions to obtain adsorption compositions with adsorbed odor matters; (2), extracting the adsorption compositions with the adsorbed odor matters by the aid of matrix solid-phase dispersion technologies; (3), separating matters extracted at the step (2) from standard samples by the aid of GC-MS (gas chromatography-mass spectrometry) and qualitatively and quantitatively detecting various components in the odor matters. The adsorption compositions comprise cucurbitnuril-grafted acrylic acid, octa-(amino phenyl trichlorosilane) and sulfonated carbon nano-tubes.

Description

technical field [0001] The invention relates to the technical field of air pollutant detection, in particular, the invention relates to a method for detecting air pollutants. Background technique [0002] With the development of the economy and the improvement of living standards, people pay more and more attention to the beautification of the living environment. A large number of decoration materials are used in the air, resulting in more and more serious air pollution problems. The main cause of air pollution is the extensive use in home decoration. Wood-based panels, adhesives, wallpapers, coatings, paints, carpets and various furniture, etc. [0003] Formaldehyde (HCHO) is a colorless and soluble irritating gas. Formaldehyde can be absorbed through the respiratory tract, and its aqueous solution "formalin" can be absorbed through the digestive tract. The formaldehyde in the air mainly comes from plywood, Man-made panels such as blockboard, medium density fiberboard and ...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
Inventor 贾梦虹徐勤东魏守良周春龙胡丹陈鲲马燕赵亿
Owner 江苏微谱检测技术有限公司
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