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Field collecting method for volatile organic compound

A technology of on-site collection of volatile organic compounds, applied in the direction of sampling devices, etc., can solve problems such as damage and achieve the effect of avoiding damage

Inactive Publication Date: 2012-01-18
CENT TESTING INT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This method belongs to destructive testing, which needs to destroy the object to be tested. It is suitable for general mass-produced products, but it is helpless for indestructible objects to be tested.

Method used

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  • Field collecting method for volatile organic compound
  • Field collecting method for volatile organic compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Will figure 1 The sampling equipment shown is carried to the site. The size of the sampling equipment is 400mm×400mm×200mm, and the volume of the gas storage space is 0.02m 3 . Select 5 to 6 representative sampling points on the object to be tested (take the wooden floor of the basketball stadium as an example), install sampling equipment, and seal it so that the sampling equipment and the surface of the object to be tested form a sealed air storage space; set parameters such as time and temperature.

[0023] Before VOC collection, the air storage space 5 needs to be cleaned. The cleaning method is: use an air pump to press the air into the air purification device, and the water vapor, carbon oxides, nitrogen oxides and VOC in the air will be removed by the air purification device. Adsorbed by the adsorbed substances in the air, the pure air is input into the gas storage space; equilibrated for 1min; the gas is pumped out. Repeat the above steps 3 to 4 tim...

Embodiment 2

[0030] Embodiment 2: The temperature is set at 60° C., the heating time is 30 minutes, and other conditions are the same as in Embodiment 1.

[0031] The test results are shown in Table 2 (taking benzene, toluene, and formaldehyde as examples).

[0032] Table 2: The VOC content (mg / m3) that embodiment 2 measures 3 )

[0033] benzene

Embodiment 3

[0034] Embodiment 3: The temperature is set at 30° C., the heating time is 120 minutes, and other conditions are the same as in Embodiment 1.

[0035] The test results are shown in Table 3 (taking benzene, toluene, and formaldehyde as examples).

[0036] Table 3: The measured VOC content (mg / m of embodiment 3 3 )

[0037] benzene

toluene

formaldehyde

0.056

0.083

0.051

[0038] something else:

[0039] 1. The warm-up time should be as short as possible, preferably within 5 minutes. If a longer heating time is selected, the preheating time can be appropriately extended to 10 minutes.

[0040] 2. During the whole collection process, the gas storage space should be well sealed, and the gas exchange rate should be less than 0.1L / h.

[0041] 3. Pure gas (such as N 2 ) instead of purifying the air has no obvious effect on the collection effect.

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PUM

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Abstract

The present invention discloses a field collecting method for a volatile organic compound (VOC). With a VOC collecting box provided by the present invention, volatile gas on the surfaces of various venues can be collected. According to the present invention, a box body of the VOC collecting box is a container with an opening on a surface; a gas storing bag with an opening on a surface is arranged inside the box body ; the position of the opening arranged on the gas storing bag is connected with the position of the opening arranged on the box body; a sealing ring is arranged on the position of the opening arranged on the box body; the sealing ring can be covered on the surface of a object requiring detection, the sealing ring is combined with the surface of the object requiring detection, such that the gas storing bag and the surface of the object requiring detection are closed to form a sealed gas storing space; at least a gas valve is arranged on the box body; the gas valve is connected with a gas pipe, wherein the gas storing space is communicated with the external through the gas pipe. The VOC collecting box provided by the present invention can be carried to the venue requiring detection by the operator, and be adopted to perform the field collecting for the surface of the object requiring detection, such that the disadvantage of the object requiring detection destroying due to the traditional volatile gas collecting apparatus is overcome.

Description

technical field [0001] The invention relates to a gas collection method, in particular to a method suitable for on-site sampling in various venues. Background technique [0002] In gas composition analysis, odor testing and other testing items, gas sampling is first required. For example, in the test of volatile organic compounds (VOC), a commonly used method is to cut the test object into a suitable size, put it into a Tedlar gas sampling bag, put it in an oven, and bake it at a suitable temperature for a period of time. The VOC in the test object volatilizes into the bag, and then the gas in the bag is extracted to make a sample and test it on the machine. [0003] This method belongs to destructive testing, which needs to destroy the object to be tested. It is suitable for general mass-produced products, but it is helpless for indestructible objects to be tested. For example, to conduct VOC detection on plastic venues in sports venues, it is necessary to be able to coll...

Claims

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Application Information

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IPC IPC(8): G01N1/22
Inventor 刘文秋董宁朱平李波郭勇
Owner CENT TESTING INT GRP CO LTD