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Solid phase adsorption air pollutant sampler and its producing method

A technology of air pollutants and solid-phase adsorption, applied in the direction of sampling devices, etc., can solve the problems of low absorption efficiency, cumbersome operation, inconsistency, etc., and achieve the effect of small wind resistance and complete absorption reaction

Inactive Publication Date: 2004-04-28
中国疾病预防控制中心环境与健康相关产品安全所
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AI Technical Summary

Problems solved by technology

[0003] In addition to the cumbersome operation of the bubble absorption method, its absorption efficiency for low-concentration air pollutants is not high
When air with pollutants enters the absorption liquid from the inlet glass thin tube of the bubble absorption tube, it is difficult to make the caliber of each inlet glass thin tube consistent due to glass processing, resulting in inconsistent diameters of bubbles generated during sampling, and air pollution in the bubbles The rate at which the pollutant diffuses to the bubble wall and is absorbed by the solution is inconsistent. The lower the concentration of air pollutants, the lower the absorption efficiency of pollutants diffused into the absorption solution on the bubble wall.
The lower the concentration of pollutants in the collected air, the more serious the problem of inefficient absorption and inconsistency

Method used

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  • Solid phase adsorption air pollutant sampler and its producing method
  • Solid phase adsorption air pollutant sampler and its producing method
  • Solid phase adsorption air pollutant sampler and its producing method

Examples

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Embodiment Construction

[0023] (1) Sampling tube for ammonia in the air:

[0024] 1. Glass tube production: Use a caliper to select a glass tube with an inner diameter of 5.0±0.1mm and an outer diameter of 8±0.2mm, and use a glass knife to cut it into a glass tube with a length of 20cm. Grind both ends of the tube with fine corundum, and use a fine emery wheel to chamfer the outer circle of the tube mouth, then put an alcohol blowtorch to burn red, the tube mouth becomes soft, cool down, make the inner and outer openings of both ends of the glass tube smooth, and make the silicone rubber stopper The rear sealing effect is better. Clean the glass tube in an ultrasonic cleaner, rinse it with deionized water, and dry it at 105°C.

[0025] 2. Surface modification of polypropylene tow:

[0026] The preparation of silicon dioxide coating liquid: take by weighing 40g sodium silicate (Na 2 SiO 3 9H 2 O A.R.) Add 960mL deionized water, microwave for 1 minute, after dissolving, add 1000mL deionized water,...

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Abstract

The sampler consists of glass tube, surface modified synthetic fiber tow with absorbing liquid and silicone rubber stoppers on two ends of the glass tube. The chemically inert synthetic fiber tow is puffed, soaked in mixed solution of sodium silicate and citric acid, surface coated with one layer of active silica, dried, washed and re-dried before being filled into the glass tube. The chemically inert synthetic fiber tow is then soaked with the absorbing liquid of various air pollutants, tumble-dried in centrifuge and the two ends are closed with silicone rubber stoppers to complete the sampling. The sampler may be used in sampling various air pollutants and has higher sampling and absorbing efficiency than available bubble method.

Description

technical field [0001] The invention relates to an air pollutant sampler and a manufacturing method thereof, in particular to an air pollutant sampler equipped with a solid-phase adsorption material used in conjunction with a sampling pump and a manufacturing method thereof. technical background [0002] Due to the constant movement of air, the concentration of pollutants in the air is constantly changing. Generally, the average value of a period of time is used to study the impact of pollutants in the air on human health. Therefore, the air pollutant concentration limits stipulated in the air quality standards and air hygiene standards are clearly stipulated as the annual average value, daily average value, and eight-hour average value. Average, hourly average, 30-minute average, etc. The instantaneous concentration values ​​of air pollutants cannot be evaluated using these standards. Instrumental and chemical methods are generally used to detect air poll...

Claims

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Application Information

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IPC IPC(8): G01N1/22G01N1/24
Inventor 戚其平姚孝元王雯
Owner 中国疾病预防控制中心环境与健康相关产品安全所
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