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Determination method of volation organic metter in air

A technology of volatile organic compounds and air, applied in the direction of color/spectral characteristic measurement, measuring devices, instruments, etc., can solve the problems of complex instrument structure and high cost, and achieve high sensitivity, low temperature, and good hydrophobicity

Inactive Publication Date: 2006-01-11
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of instrument has a complex structure and high cost

Method used

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  • Determination method of volation organic metter in air
  • Determination method of volation organic metter in air
  • Determination method of volation organic metter in air

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of the sampling tube in the method of the present invention is described.

[0032] 1) Treatment of adsorbent:

[0033] Put poly-2,6-diphenyl-p-phenylene ether, 60-80 mesh, into a U-shaped glass tube, under the protection of deoxidized high-purity nitrogen with a flow rate of 100-300 ml / min, aging treatment, temperature program It is: the initial temperature is 50°C, and the temperature rises to 350°C at a rate of 0.5°C / min.

[0034] 2) Sampling tube specifications and filling of poly-2,6-diphenyl-p-phenylene ether:

[0035] The sampling tube is a glass or stainless steel tube with a specification of 70mm×Φ7mm (outer diameter). One end is straight (lower end), and the other end has a bell mouth (upper end). The design of the mouth end and bell mouth is conducive to its installation and disassembly in the desorption furnace.

[0036] Fill the tube with 0.3 g of poly-2,6-diphenyl-p-phenylene ether treated in step 1), and fill the two ends with 6 mm quart...

Embodiment 2

[0040] The online combined use of thermal desorption instrument and chromatograph in the method of the present invention is described. figure 1 It is a schematic diagram of the on-line combination of the primary thermal desorption instrument and the gas chromatograph in the method of the present invention.

[0041]In the experiment, a gas chromatograph equipped with a split capillary inlet and an FID detector was used for analysis, and a methylpolysiloxane elastic quartz capillary column with a specification of 50 meters × 0.32 mm inner diameter × 1.0 micron (film thickness) was selected. Temperature operating conditions: 50°C (hold for 10 minutes), temperature rises to 250°C at a rate of 5°C / min, other operating conditions are: vaporization chamber temperature: 250°C; detector (FID) temperature: 260°C, FID hydrogen flow: 38 ml / min, FID air flow: 320 ml / min, FID makeup gas (N 2 ) flow: 28 ml / min, pre-column pressure: 0.1 MPa, split ratio: 1:15, sample volume: 1 microliter for...

Embodiment 3

[0045] The online performance of the first-stage thermal desorption instrument and gas chromatograph is described.

[0046] Benzene, toluene, n-butyl acetate, ethylbenzene, p-xylene, styrene, o-xylene and n-undecane are the most representative compounds in air pollution. Get containing each compound concentration and be 0.1 mg / ml, solvent is 1 microliter of the mixed standard solution of carbon disulfide, analyze by the conditions described in example 2 respectively with thermal desorption sample injection and direct sample injection two modes, obtain two chromatograms . Contrast attached image 3 From the two spectral lines in a and b, it can be seen that the first-stage desorption sampling can make the capillary chromatographic column maintain a high separation (resolution) ability for the peaks, without causing the peaks to broaden, and achieve the effect of a secondary structure with a cold trap , the peak shape is consistent with direct injection. Peaks 1 to 8 are in o...

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Abstract

The present invention relates to a method for determining volatile organic compound in the air. Said method uses the sampling tube in which poly 2.6-diphenyl p-benzoether is held to collect air at normal temperature, the volatile organic compound can be adsorbed in the sampling tube, then the sampling tube is placed in first-order thermal desorption instrument to make thermal desorption, and the volatile organic compound can be fed into gas chromatograph from thermal desorption instrument with carrier gas to make separation and determination.

Description

technical field [0001] The invention relates to the technical field of analysis and testing methods, in particular to a method for measuring volatile organic compounds in air. Background technique [0002] "Indoor air pollution" appeared as early as the mid-1960s, and some environmental protection experts in the world listed it as the third generation of pollution after "soot pollution" and "petroleum pollution". New building materials and their additives, decoration materials, office equipment (such as printers), daily chemicals, etc. release many volatile organic pollutants during a large amount of use. These organic pollutants exist indoors and can pass through the respiratory and digestive tracts. Long-term exposure to such pollutants can cause teratogenic, mutagenic and carcinogenic effects on the human body. Modern people spend 70-80% of their time indoors every day, especially infants, young children, the elderly, the sick, and the disabled spend more time indoors. M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88G01N1/22G01N30/74G01N21/31
Inventor 梁冰李辰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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