Method for determining ethanol content in workplace

Abstract

The invention discloses a method for determining the content of ethanol in a workplace. The method comprises four steps of sample collection, sample treatment, standard curve preparation, sample determination and result calculation. Compared with the prior art, the method has the advantages that the detection process is simple, and the content of ethanol in gas can be rapidly determined; a Tenax sampling tube is adopted to collect ethanol in a working place, so that the use of a chemical solvent can be avoided; the analysis efficiency is improved; the sampling tube is filled with a filler, and the filler has excellent adsorption performance on C2-C5 short-chain analytes, so that the interference of N,N-dimethylformamide on ethanol content determination in traditional methods is reduced, and the analysis accuracy is improved; and the detection limit of ethanol content analysis is improved, the residual fine ethanol content in the air can be captured, the determination of the ethanol content can be sampled and analyzed together with volatile organic compounds, a detector can collect a sample and complete the determination of the volatile organic compounds and the ethanol content at the same time, and the analysis efficiency is improved.

Description

technical field [0001] The invention relates to the field of ethanol detection, in particular to a method for measuring ethanol content in workplaces. Background technique [0002] Ethanol, commonly known as alcohol, has a wide range of uses. Ethanol can be used to make acetic acid, beverages, flavors, dyes, fuels, etc. Ethanol with a volume fraction of 70%~75% is also commonly used as a disinfectant in medical treatment, and it is widely used in national defense chemical industry, medical and health care, food industry, and industrial and agricultural production. [0003] Ethanol is a flammable, volatile, colorless and transparent liquid at normal temperature and pressure. It has low toxicity and cannot be drunk directly in pure liquid. It has a special fragrance and is slightly irritating. It is flammable, its vapor can form explosive mixture with air, and it can be miscible with water in any ratio. [0004] At present, gas chromatography is mostly used in the determinat...

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Problems solved by technology

[0004] At present, gas chromatography is mostly used in the determination of ethanol content in China, which uses N,N-dimethylformamide as a solvent to dissolve ethanol, and then analyzes the ethanol content, while dimethylformamide in the workplace Amides are also one of the targets of our determination. A large amount of N,N-dimethylformamide solvent produced during the determination of ethanol content volatilizes into the detection environment, which will also have a certain impact on the accurate determination of dimethylformamide. It is not easy to measure two components at the same time, which reduces the production efficiency; in addition, the detection limit of ethanol content by gas chromatography is higher than that of gas chromatography mass spectrometry, and it is difficult to detect low-concentration ethanol content

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