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Test method and special device for sampling efficiency of volatile organic compounds in air

A technology of volatile organic compounds and sampling efficiency, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems that the volume of gas production cannot be simulated with the actual situation, the meteorological parameters cannot be matched, and it is not scientific, so as to achieve the results of detection and analysis Accurate, simple structure, wide range of effects

Inactive Publication Date: 2015-08-12
江苏象田生态环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The traditional method of sampling efficiency testing is usually solved in two ways. One is sampling in large plastic bags or fume hoods. The volume of gas collected in this way cannot be simulated with the actual situation, and the meteorological parameters cannot be matched. The stability is poor and it is not scientific.

Method used

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  • Test method and special device for sampling efficiency of volatile organic compounds in air
  • Test method and special device for sampling efficiency of volatile organic compounds in air
  • Test method and special device for sampling efficiency of volatile organic compounds in air

Examples

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Embodiment 1

[0060] The most common and most analyzed volatile organic compounds in the air are benzene series, which are generally referred to as benzene, toluene, ethylbenzene, p-xylene, m-xylene, o-xylene, cumene, and styrene. It is the most common compound in the atmospheric environment and many pollution source gases, and has certain harmful effects on human health. Among them, benzene was recognized by the World Health Organization (WHO) as a strong carcinogen in 1993, which can cause leukemia and aplastic anemia. recognized by the medical profession. They are therefore important pollutants of the environment. Taking the sampling and testing efficiency of benzene series in the air as an example, the sampling efficiency testing device of the present invention is used for testing.

[0061] The method for testing the sampling efficiency of volatile organic compounds in the air includes the following steps:

[0062] Prepare the gas to be tested, control the pressure of the diluent gas ...

Embodiment 2

[0087] The difference from Example 1 is that in Example 2, the flow rate of the flow meter 15 is designed to be 3000 mL / min, and the collection time is 10 minutes.

Embodiment 3

[0089] The difference from Example 1 is that in Example 3, the flow rate of the flow meter 15 is designed to be 500 mL / min, and the collection takes 200 minutes.

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Abstract

The invention belongs to the field of environment monitoring, particularly relates to a test method for sampling efficiency of volatile organic compounds in air, and further relates to a special device used in the test method. The test method comprises the following steps: preparing a to-be-tested gas; controlling the gas pressure in a steel cylinder I and steel cylinders II; adjusting pressure distributing meters; enabling a diluent gas and a standard gas to flow to the furnace box of a temperature and humidity control device according to a proportion; adjusting the temperature and humidity in the furnace box; enabling the gas to flow out from the top of the furnace box to enter a dynamic uniform-mixing device for uniform mixing; enabling the uniformly-mixed gas to enter sampling adsorption devices to be adsorbed by an adsorbent or an adsorption liquid in the sampling adsorption devices; emptying the residual gas; calculating. According to the invention, the test method is provided for the field of environmental monitoring, and the test device matched with the test method is designed, so that scientific research on gas sampling and adsorbing in the field of environment monitoring and even in other industries is more accurate, rigorous and scientific.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and in particular relates to a method for testing the sampling efficiency of volatile organic compounds in the air, and also relates to a special device for testing the sampling efficiency of volatile organic compounds in the air by using the method. Background technique [0002] At present, there are standard analysis methods for the determination of volatile organic compounds in the air and exhaust gas of the environmental protection industry. much larger than the analytical error. The reason why these standards do not pay attention to the sampling method is not because they do not know the importance of the sampling method, but because there is no suitable sampling test efficiency device to simulate the sampling efficiency problem during on-site sampling, so these standards ignore the sampling method. This is also an important reason why a large part of the environmental pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02
Inventor 章勇赵永刚张蓓蓓孙玉霞
Owner 江苏象田生态环境科技有限公司