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Method for simultaneously collecting and detecting VOCs and IVOCs on line

A detection method and detection device technology, applied to measuring devices, sampling, instruments, etc., can solve the problem that online detection devices are difficult to collect and analyze VOCs and IVOCs at the same time

Active Publication Date: 2020-08-25
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The present invention aims at the technical problem that the existing online detection device is difficult to collect and analyz

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  • Method for simultaneously collecting and detecting VOCs and IVOCs on line
  • Method for simultaneously collecting and detecting VOCs and IVOCs on line
  • Method for simultaneously collecting and detecting VOCs and IVOCs on line

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Embodiment Construction

[0033] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific diagrams.

[0034] refer to figure 1, an online collection and detection device, including a temperature-controlled sampling channel 1, a TD (thermal desorption) system 2, a GC / MS (gas chromatography / mass spectrometry) analysis system 3, and the TD system 2 includes at least one set of sampling tubes, and the sampling tubes Both include a sampling tube 21 equipped with a VOCs adsorbent and a sampling tube 22 equipped with an IVOCs adsorbent, and the two sampling tubes are respectively connected to two parallel ports (ends II) of the tee 23 . Preferably, the TD system 2 includes two sets of sampling tubes, namely sampling tube set A and sampling tube set B. The interface (I end) of the three-way 23 and the temperature-controlled sampling channel 1 in each group ...

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Abstract

The invention belongs to the technical field of environmental monitoring, and particularly relates to a method for simultaneously collecting and detecting volatile organic compounds and medium volatile organic compounds on line. The method for simultaneously collecting and detecting VOCs and IVOCs on line comprises the following steps that an online collection and detection device is adopted for conducting the following steps that a standard sample or ambient air enters a TD system through a temperature control sampling channel, and a sampling pipe set in the TD system conducts adsorption sampling on a target substance at the same time; meanwhile, the other sampling pipe group desorbs a target substance by adopting inert gas, and the desorbed target substance is loaded into a GC/MS analysis system by high-purity helium through a sample transmission pipeline; in a GC/MS analysis system, a Dean-Switch switching system is used for carrying out secondary separation on a target object VOCswhich are separated firstly, and the target object VOCs and a target object IVOCs which are separated for the second time are detected and analyzed at the same time by a mass spectrum detector. According to the method for simultaneously collecting and detecting VOCs and IVOCs on line, the purposes of once sampling and simultaneously collecting and analyzing VOCs and IVOCs on line are achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and in particular relates to a simultaneous online collection and detection method of volatile organic compounds and medium volatile organic compounds. Background technique [0002] The organic matter in the atmosphere can be divided into intermediate volatile organic compounds (IVOCs) according to the saturation concentration (C*), the saturation concentration range is 10 3 μg / m 3 <C*<10 6 μg / m 3 ) and volatile organic compounds (VOCs, the saturation concentration range is C*>10 6 μg / m 3 ). Since VOCs are considered O 3 It is an important precursor of secondary organic aerosol (SOA), so it has always been the focus of research by researchers and relevant management departments. The latest research shows that IVOCs are also 3 and SOA's important precursors, and has aroused extensive interest of researchers. In addition, VOCs and IVOCs also have important hazards...

Claims

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Application Information

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IPC IPC(8): G01N1/22G01N30/06G01N30/20G01N30/60
CPCG01N1/2214G01N1/2247G01N1/2273G01N30/06G01N30/20G01N30/6043G01N2030/201Y02A50/20
Inventor 李英杰黄成景盛翱王红丽楼晟荣高雅琴
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES