Detection method for inorganized emission of volatile organic compounds (VOCs)

A technology of volatile organic compounds and fugitive emissions, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as lack of analysis results, time-consuming and labor-consuming processing steps, and inability to apply accurate detection of fugitive volatile organic compounds. Achieve the effect of simple operation and accurate detection results

Inactive Publication Date: 2017-10-24
JIANGSU ENVIRONMENTAL MONITORING CENT
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  • Abstract
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the detection of volatile organic compounds in the existing atmospheric samples, such as the time-consuming and labor-consuming pretreatment steps, the lack of timeliness of the analysis results, and the inability to meet the needs of on-site analysis. Insufficient accurate detection of volatile organic compounds, providing a detection method for fugitive emissions of volatile organic compounds

Method used

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  • Detection method for inorganized emission of volatile organic compounds (VOCs)
  • Detection method for inorganized emission of volatile organic compounds (VOCs)
  • Detection method for inorganized emission of volatile organic compounds (VOCs)

Examples

Experimental program
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Embodiment 1

[0029] Establishment of standard curve:

[0030] (1) Configuration of standard gas samples: A dynamic gas diluter was used to prepare 65 VOCs mixed standard gases (TO-15) with 5 different volume fractions. For targets that are not in TO-15, the air bag preparation method is used, and the background gas is high-purity nitrogen. The volume fractions of the 5 kinds of standard music are 1×10 -10 , 5×10 -10 , 1×10 -9 , 5×10 -9 , 1×10 -8 . According to the set analysis conditions, the data files of 5 compounds with different concentrations were obtained, and the corresponding standard curve was established by using the calibrate calibration function of the built-in software of the portable GC / MS, and the regression equation of each component to be tested was obtained.

[0031] The chromatographic conditions of this example are as follows: the chromatographic column adopts SPB-1 chromatographic column, the specification is 30m×0.32mm×1.0μm, and there are 2 kinds of internal st...

Embodiment 2

[0033] In this embodiment, the volatile organic compounds discharged indiscriminately from a grain and oil factory are detected, and the steps are as follows:

[0034](1) Sample collection and concentration: According to "Technical Specifications for Layout of Ambient Air Quality Monitoring Points (Trial)" (HJ664-2013) and "Technical Guidelines for Monitoring Unorganized Emissions of Air Pollutants" (HJ / T 55-2000) Requirements, comprehensively consider meteorological conditions, industrial layout, population distribution, roads and other factors, determine the sampling point, use the portable GC-MS hand-held probe to automatically collect atmospheric samples, the sampling volume is 300mL, and use the portable GC-MS built-in Tri-bed concentrator to concentrate sample.

[0035] (2) Sample detection: the chromatographic-mass spectrometry detection conditions are the same as those in Example 1, and the instrument response value that is detected is combined with the standard curve ...

Embodiment 3

[0037] In this embodiment, the volatile organic compounds discharged indiscriminately from Yi grain and oil factory are detected, and the steps are as follows:

[0038] (1) Sample collection and concentration: According to "Technical Specifications for Layout of Ambient Air Quality Monitoring Points (Trial)" (HJ664-2013) and "Technical Guidelines for Monitoring Unorganized Emissions of Air Pollutants" (HJ / T 55-2000) Requirements, comprehensively consider meteorological conditions, industrial layout, population distribution, roads and other factors, determine the sampling point, use the portable GC-MS handheld probe to automatically collect atmospheric samples, the sampling volume is 100mL, and use the Tri-bed concentrator to concentrate the samples.

[0039] (2) Sample detection: the chromatographic-mass spectrometry detection conditions are the same as the conditions in Example 1, and the instrument response value obtained by the detection is combined with the standard curve i...

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Abstract

The invention provides a detection method for inorganized emission of volatile organic compounds (VOCs) and belongs to the technical field of gaseous pollutant detection. In the method, samples are directly collected by a sample injection probe of a portable gas chromatography-mass spectrum instrument, so that the inorganize-discharged VOCs are subjected to quick and accurate on-site analysis by means of CG quantitative capability of the portable GC-MS and qualitative capability of a MS detector, thus solving problems that analysis results are poor in timeliness and target substances are lost due to intermediate links, such as transportation and storage, and long analysis time of the samples in a conventional analysis and detection method of the VOCs in the prior art. The method also greatly simplifies sample collection and concentration steps, so that the inorganize-discharged VOCs are subjected to on-site detection and qualitative and quantitative results can be shown timely. The method has important meanings for monitoring of the inorganize-discharged VOCs. The method is not limited to grain and oil industry, but is also suitable for detection on the inorganize-discharged VOCs in various food processing industries, such as liquor factory, vinegar factory, pickled vegetable factory and the like.

Description

technical field [0001] The present invention relates to a rapid qualitative and quantitative detection method for unorganized emission of volatile organic compounds in grain and oil factories, and specifically relates to a method for on-site rapid qualitative and quantitative detection of unorganized emission of volatile organic compounds in grain and oil factories by using portable gas chromatography-mass spectrometry technology method. Background technique [0002] Volatile organic compounds (Volatile organic compounds, VOCs) are an important class of gaseous pollutants, which usually refer to organic compounds with a boiling point of 50-260°C at normal pressure and a saturated vapor pressure exceeding 133.32Pa at room temperature. As important gaseous pollutants, VOCs have a significant impact on the atmospheric environment and human health. Relevant research results show that VOCs in the atmosphere are the main substances containing organic carbon participating in atmos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/06G01N30/88
CPCG01N30/06G01N30/88
Inventor 胡冠九高占啟王荟朱冰清陈素兰
Owner JIANGSU ENVIRONMENTAL MONITORING CENT
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