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Method for determining ethanol content by gas chromatography in non-aqueous medium

A gas chromatography, non-aqueous medium technology, used in the field of ethanol content detection, can solve problems such as poor accuracy, and achieve the effects of improving service life, improving stability and high detection accuracy

Pending Publication Date: 2020-11-20
安徽精公检测检验中心有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the long-term accuracy of existing gas chromatography detection methods is poor

Method used

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  • Method for determining ethanol content by gas chromatography in non-aqueous medium
  • Method for determining ethanol content by gas chromatography in non-aqueous medium
  • Method for determining ethanol content by gas chromatography in non-aqueous medium

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Embodiment 1

[0037] The chromatographic conditions of gas chromatography internal standard method are:

[0038]Chromatographic column: InertCap WAX capillary column (30m×0.25mm, 0.25μm), column temperature: the initial temperature is 100°C, maintain for 5min, raise the temperature to 240°C at a rate of 120°C / min, maintain for 5min, split ratio: 10: 1. Inlet temperature: 250°C, detector temperature: 250°C, injection volume 0.5μL, column flow rate: 1.41mL / min, linear velocity: 35cm / sec, hydrogen: 30mL / min, air: 400mL / min, Makeup: 12mL / min.

[0039] 1. Preparation of standard solution and calculation of mass correction factor:

[0040] According to the formula in Table 1, five solutions with different concentrations were prepared as standard solutions. The specific preparation process was as follows: Weigh 60 g of absolute ethanol into a 100 mL volumetric flask, use DMF as a solvent, and shake to a constant volume. Weigh 60g of isobutanol into another 100 volumetric flask, use DMF as solven...

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Abstract

The invention discloses a method for determining ethanol content by gas chromatography in a non-aqueous medium. Isobutanol is used as an internal standard substance, N, N-dimethylformamide is used asa solvent, and gas chromatography detection conditions are as follows: an InertCap WAX capillary column with the specification of 30m * 0.25 mm and 0.25 mu m is used. Column temperature: the initial temperature is 100 DEG C, and the temperature is maintained at for 5 min, heating to 240 DEG C at a rate of 120 DEG C / min, and the temperature is maintained for 5 min. The split ratio is 10: 1. The temperature of a sample inlet is 250 DEG C. The temperature of the detector is 250 DEG C, the sample injection volume is 0.5-1 [mu]L, the column flow rate is 1.41 mL / min and the like, and the method canreduce the loss of effective components of the chromatographic column, improve the detection stability and prolong the service life of the chromatographic column on the basis of ensuring the detectionaccuracy.

Description

technical field [0001] The invention relates to ethanol content detection, in particular to a method for measuring ethanol content by gas chromatography in a non-aqueous medium. Background technique [0002] Alcohol-based hand sanitizers have gradually become a substitute for soap due to their convenience and cleanliness, and are loved by people. Alcohol in alcohol-based hand sanitizer is the main sterilizing and disinfecting component. In order to effectively detect the content of ethanol in hand sanitizer and ensure the effect of disinfection. At present, the most accurate method for detecting ethanol is gas chromatography, usually using water as a solvent. When ethanol is detected, especially when detecting the content of ethanol in gel hand sanitizer, in order to improve the accuracy of detection, the prior art uses n-propanol was used as internal standard. However, the long-term accuracy of existing gas chromatography detection methods is poor. [0003] Therefore, pr...

Claims

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Application Information

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IPC IPC(8): G01N30/02
CPCG01N30/02G01N2030/045
Inventor 李保军陈钦松王圣娜王莹徐雪玲刘梦雪肖慧丽徐文祥张亚楠沈江平王一健
Owner 安徽精公检测检验中心有限公司