Method for determining ethanol in air

Abstract

The invention relates to a method for determining ethanol in air. The method comprises the following steps: sampling: serially connecting two bubble absorption tubes filled with 5.0 ml of redistilled water respectively, and sampling for 2-3 hours at a flow rate of 150 ml / min; drawing of a standard curve: taking 6 10ml colorimetric tubes with plugs, preparing ethanol according to a standard table, taking 2.0 microliters of standard samples from the 6 colorimetric tubes by using a microsyringe respectively, performing chromatographic analysis, and drawing a standard curve according to the peak area to the ethanol concentration; and sample determining: fixing the volume of the sample to 5 ml, taking 2 microliters of the sample from each of the two bubble absorption tubes for sampling through a microsyringe, injecting the sample into a gas chromatograph for analysis and determination, and finding out the concentration of ethanol in each bubble absorption tube on the standard curve according to the peak area. According to the invention, pure water is used for absorbing ethyl alcohol in air, a sample is separated through a chromatographic column so as to effectively separate methyl alcohol and ethyl alcohol peaks, a flame ionization detector is used for determination, qualitation is achieved through retention time, and quantification is achieved through peak area.

Description

technical field [0001] The invention discloses a method for measuring ethanol in the air, which belongs to the technical field of ethanol measurement. Background technique [0002] Due to the high separation efficiency and high sensitivity of gas chromatography technology, gas chromatography has been widely used in the determination of ethanol in the past 10 years. According to its sampling technique, it can be divided into two methods: one is liquid gas analysis method; the other is direct sampling analysis method. [0003] The existing determination method is not specific to ethanol, because other volatile substances such as acetone, acetaldehyde, methanol, propanol in the sample interfere with the determination of ethanol. Therefore, in many cases, it is difficult to solve the qualitative and quantitative problems of ethanol. In order to solve the above problems, the present invention aims at the interference of ethanol due to volatile substances in the test materials. ...

AI Technical Summary

Problems solved by technology

Therefore, in many cases, it is difficult to solve the qualitative and quantitative problems of ethanol. In order to solve the above problems, the present invention aims at the measurement of ethanol interference due to volatile substances in the test material.

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