Method for determining ethanol in air by purging and trapping
A technology of purge and trap and ethanol, which is applied in the direction of measuring devices, sampling, instruments, etc., and can solve the problem that there is no standard method for ethanol
Pending Publication Date: 2021-07-06
JIANGYIN QIUHAO TESTING CO LTD
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- Application Information
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Problems solved by technology
However, there is currently no standard method for the detection of ethanol in the gas phase.
Method used
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Embodiment 1
[0072] A method utilizing purge and trap to measure ethanol in the air, comprising the following steps:
[0073] S1: Collect samples and seal them after completion;
[0074] S2: After the sample is purged and trapped, it is blown into the GC-MS, and the sample is analyzed and calculated to obtain the ethanol concentration.
[0075] Among them, S1:
[0076] (1) Put the phenolic resin in ethanol, stir mechanically for 20-30 minutes, add iron acetylacetonate, stir mechanically for 20-30 minutes, oscillate ultrasonically for 5-10 minutes, stir mechanically for 6-8 hours, and use the electrospinning method to prepare the mixed liquid For composite fibers, heat the composite fibers to 150°C for 2 hours, heat to 170°C for 1 hour, heat to 190°C for 1 hour, place them in an ammonia environment, heat the composite fibers to 700°C for 1 hour, then heat them up to 950°C Heating for 1 hour, mechanically stirring in a mixed solution of sulfuric acid and hydrogen peroxide for 3 to 4 hours,...
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Abstract
The invention discloses a method for determining ethanol in air by purging and trapping. According to the method, a gas chromatograph-mass spectrometer is adopted for detection, more accurate quantitative detection can be performed, false positive conditions, especially interference of substances such as methanol and ethylene glycol, are eliminated through ion fragments, the detection limit is lower and more sensitive, and the lowest detection limit can reach 0.02 mg / m<3>; compared with a common static headspace, a purging and trapping technology adopted in pretreatment has great advantages, the purging and trapping technology enables gas to continuously pass through a sample, volatile components in the gas are extracted and then trapped, non-equilibrium continuous extraction is achieved, and compared with the static headspace, the analysis sensitivity of a dynamic headspace is greatly improved; and the method for determining ethanol in air by purging and trapping disclosed by the invention solves the problem that ethanol cannot be detected in the prior art, and has relatively high practicability.
Description
technical field [0001] The invention relates to the technical field of environmental detection, in particular to a method for measuring ethanol in air by purging and trapping. Background technique [0002] Ethanol, also known as alcohol, is a saturated monohydric alcohol, colorless, transparent, volatile, and flammable. It is widely used in daily life and is widely used in industries such as industry, medical treatment, organic synthesis, food, and printing. Using it will inevitably cause the air we breathe to be more or less full of molecules, which will have a certain impact on our body. [0003] With the continuous development of modern industry and the progress of society, all parties pay more and more attention to the pollution of VOCs in the air, especially the precursor organic substances that can form ozone. Ethanol is also gradually paid attention to as the precursor organic substances of ozone. However, there is no standard method for the detection of ethanol in t...
Claims
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IPC IPC(8): G01N30/02G01N1/22
CPCG01N30/02G01N1/2214G01N1/2273G01N2001/2217Y02A50/20
Inventor 杨骁蒋军任云飞谢茜高亮
Owner JIANGYIN QIUHAO TESTING CO LTD