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Method for detecting benzene and total volatile organic compounds in indoor air and sampling device

A technology for organic compounds and detection methods, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problem that the temperature of the adsorption tube cannot be said to be sufficient, limit the sampling and detection of benzene, etc., achieve sensitive temperature adjustment, high recovery rate, avoid The effect of short-term fluctuations

Inactive Publication Date: 2018-10-23
广州市赛特检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the real environment, you may often encounter high temperature weather in summer, or you need to work in areas with high temperature all year round. The indoor high temperature environment greatly limits the sampling and detection of benzene using Tenax-TA adsorption tubes.
[0010] It can be seen that in the prior art, although a certain amount of research has been done on the detection of benzene in the air by using the sampling tube filled with Tenax-TA adsorbent, the control of the temperature of the adsorption tube cannot be said to be sufficient.

Method used

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  • Method for detecting benzene and total volatile organic compounds in indoor air and sampling device
  • Method for detecting benzene and total volatile organic compounds in indoor air and sampling device
  • Method for detecting benzene and total volatile organic compounds in indoor air and sampling device

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no. 1 Embodiment approach

[0051] In the first embodiment, the present invention provides a method for detecting benzene and total volatile organic compounds in indoor air, the method comprising the following steps:

[0052] 1) Use the adsorption tube 1 for gas sampling, and control the temperature of the adsorption tube 1 to be below 28°C through the temperature adjustment device 2, wherein the adsorbent filled in the adsorption tube 1 includes 60-80 mesh Tenax-TA adsorbent ;

[0053] 2) Analyzing the adsorption tube 1 in an analyzer, and sending the analyzed gas directly into the chromatograph for analysis;

[0054] 3) Calculate the content of benzene and total volatile organic compounds by peak area quantitative, retention time qualitative, and area external standard method, respectively.

[0055] The detection method described above can realize the detection of benzene and TVOC at the same time, and replace the detection of benzene with the benzene content in the TVOC determination, that is, only t...

no. 2 Embodiment approach

[0069] In the second embodiment, the present invention provides a sampling device used in the detection method of the first embodiment, and the sampling device includes:

[0070] Adsorption tube 1, flow meter, suction pump, control system, power supply, and

[0071] Temperature adjustment device 2, said temperature adjustment device 2 comprises a thermostat 21, a surface temperature sensor 22 installed in said thermostat 21, a refrigeration device 23 installed at one end of said thermostat 21 outside and a heating device 24 at the other end , the adsorption tube 1 is placed in the thermostat 21 , and the surface temperature sensor 22 is in contact with the outer wall of the adsorption tube 1 .

[0072] It can be understood that in the detection device of the present embodiment, the control system is connected with components such as a flow meter, a steam extraction pump, a power supply, and a temperature adjustment device 2, and the flow rate is controlled by the control syste...

Embodiment 1

[0087] (1) A stainless steel adsorption tube 1 with a length of 150 mm, an outer diameter of 6.35 mm, and a thickness of 1.0 mm is filled with 200 mg of 60-80 mesh Tenax-TA adsorbent, and the adsorption tube is activated until there are no miscellaneous peaks;

[0088] (2) In a volume of 1m 3 The known concentration of stupid and total volatile organic compound gas is released in the environmental test chamber. The air pressure in the environmental test chamber is 101.50kPa, the relative humidity is 70.5%, and the ambient temperature is 35°C.

[0089] Use the sampling device provided by the second embodiment for sampling, and set the following sampling parameters: the sampling temperature is 28°C, the sampling flow rate is 0.2L / min, and the sampling time is 10min;

[0090] (3) After the sampling is finished, analyze the adsorption tube 1 in a thermal analyzer at 300° C., and send the analyzed gas directly into a gas chromatograph for chromatographic analysis;

[0091] (4) Cal...

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Abstract

The invention discloses a method for detecting benzene and total volatile organic compounds in indoor air and a sampling device. The method comprises the following steps: 1) using an adsorption tube for air sampling, and controlling the temperature of the adsorption tube to be below 28DEG C by a temperature adjusting device, wherein an adsorbent filled in the adsorption tube comprises 60 to 80 mesh-Tenax-TA adsorbent; 2) resolving the adsorption tube in a resolver, and directly sending an analytical gas to a chromatograph for analysis; and 3) respectively calculating the content of the benzeneand the total volatile organic compounds by peak area quantification, retention time qualification, and area external standard method. The method can simultaneously detect the benzene and the total volatile organic compounds, overcomes the influence of ambient temperature, avoids a penetrating phenomenon, has high recovery rate, and is simple in operation, thereby effectively saving workload andcost.

Description

technical field [0001] The invention relates to a gas detection method and a sampling device, in particular to a detection method of benzene and total volatile organic compounds in indoor air, belonging to the technical field of environmental monitoring. Background technique [0002] According to the current national standard "Code for Indoor Environmental Pollution Control of Civil Building Engineering" (GB50325-2010 (2013 Edition)) (hereinafter referred to as "Specification"), different methods are used to control benzene and total volatile organic compounds (TVOC) in the air. Perform sample testing. Among them, benzene should be collected with activated carbon tube, the sampling volume is about 10L, thermal desorption is directly injected into gas chromatography, and the peak area is quantified; TVOC uses Tenax-TA adsorption tube to collect gas samples with a volume of about 10L, and thermal desorption is directly injected into gas phase. spectrum analysis. [0003] How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 谭晶吴志成蔡宝雄文文方熙坤
Owner 广州市赛特检测有限公司
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