Method of determining content of methanol, isobutanol, isoamylol of alcohol

Abstract

The invention discloses a method of determining content of methanol, isobutanol, and isoamylol of alcohol, and relates to methods of determining alcohols. The method of determining the content of the methanol, the isobutanol and the isoamyol of the alcohol comprises steps as below sequentially: (1) alcohol sample pretreatment processing steps: moving sample alcohol into a volumetric flask, adding interior label solution into the volumetric flask, using absolute ethanol to dilute the solution to a constant volume measured by scales, blending the solution to be used as the solution to be tested; (2) blank experiment: adding no samples, and repeating the step (1); (3) carrying out combination analysis of gas chromatography-mass spectra analysis of the samples and the blank sample. The method of determining the content of the methanol, the isobutanol, and the isomylol of the alcohol achieves accurate precise quantification analysis of the content of the methanol, the normal propyl alcohol, the isobutanol and the isoamylol of the alcohol through method improvement and replacing of detectors. The method of determining the content of the methanol, the isobutanol and the isoamylol of the alcohol is simple to operate and fast and accurate.

Description

technical field [0001] The invention relates to a method for measuring alcohol, in particular to a method for measuring the contents of methanol, n-propanol, isobutanol and isoamyl alcohol in alcohol. Background technique [0002] The chemical components in alcohol are various and very complicated. Methanol, n-propanol, isobutanol, and isoamyl alcohol are harmful components in alcohol. At present, most of their determination methods are gas chromatography, and they all use single-stage The method of calculating the calibration factor of the standard sample and then quantifying it requires that the solvent used does not contain any methanol, n-propanol, isobutanol, and isoamyl alcohol, and the requirements for the solvent are particularly high. For propanol, isobutanol, and isoamyl alcohol, there will be deviations in the calculated amounts of samples and blank samples, resulting in large deviations in the final quantitative results. In addition, since the calibration factor...

AI Technical Summary

Problems solved by technology

[0002] The chemical components in alcohol are diverse and very complex. Methanol, n-propanol, isobutanol, and isoamyl alcohol are harmful components in alcohol. At present, most of their determination methods are gas chromatography, and they all use single-stage The method of calculating the calibration factor of the standard sample and then quantifying it requires that the solvent used does not contain any methanol, n-propanol, isobutanol, and isoamyl alcohol, and the requirements for the solvent are particularly high. For propanol, isobutanol, and isoamyl alcohol, there will be deviations in the calculated amounts of samples and blank samples, resulting in large deviations in the final quantitative results

In addition, since the calibration factor is calculated by a single-level standard sample, it is very easy to cause a large deviation in the calibration factor, resulting in a large deviation in the final quantitative result.

In addition, the detector used in gas chromatography is an FID detector. Compared with mass spectrometry detectors, there is a gap in terms of detection sensitivity and locking target compounds.