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目的建立一种食用酒精和工业酒精的快速光谱检测方法。方法样品经提取和蒸馏水配制,分为甲醇分析纯和乙醇分析纯对照组、工业酒精和食用酒精实验组、浓度均为50%的工业酒精水溶液和食用酒精水溶液实验组和浓度均为50%的甲醇水溶液和工业酒精水溶液以及食用酒精水溶液实验组。使用光谱仪和紫外可见近红外分光光度计进行光谱检测。结果在10 min内完成对照组和实验组样品溶液配制,5 min获得样品紫外-可见光-近红外光谱。在光谱中,浓度为50%的工业酒精水溶液在220 nm和1150 nm处均有一个不同的特征峰,在200~300 nm波段有很大的强度差异,对比浓度均为50%的甲醇水溶液和食用酒精水溶液显示只有浓度为50%的工业酒精水溶液在200~300 nm波段内有特征峰。结论该方法检测快速、结果准确、操作简单。通过检测酒类产品在200~1400 nm波长范围的光谱,可以测定工业酒精和食用酒精的真假。
Objective To establish a rapid spectral detection method for edible alcohol and industrial alcohol. Methods The samples were prepared by extraction and distilled water. The samples were divided into two groups: alcohol and ethanol analysis control group, industrial alcohol and alcohol consumption test group, 50% industrial alcohol solution and alcoholic solution test group and 50% Methanol aqueous solution and industrial alcohol solution and edible alcohol solution experimental group. Spectroscopy and UV-visible NIR spectrophotometry were used for spectral detection. Results The control and experimental samples were prepared within 10 min, and the UV-Vis-NIR spectra of the samples were obtained after 5 min. In the spectrum, the industrial alcohol aqueous solution with a concentration of 50% has a different characteristic peak at 220 nm and 1150 nm, and has great intensity difference in the wavelength range of 200-300 nm. The contrast concentration is 50% aqueous solution of methanol and Edible alcohol solution showed only 50% concentration of industrial alcohol solution in the 200 ~ 300 nm band characteristic peaks. Conclusion The method is rapid, accurate and easy to operate. By detecting alcohol products in the 200 ~ 1400 nm wavelength range of the spectrum, you can determine the true and false of industrial alcohol and alcohol consumption.