分光光度法测定白酒中乙醇的含量

Determination of Ethanol Content in Liquor by Spectrophotometry

根据乙醇可以被酸性高锰酸钾溶液氧化,使酸性高锰酸钾溶液吸光度降低的原理,建立了测定白酒中乙醇含量的新方法。结果表明,可以乙醇的量(C)与酸性高锰酸钾溶液吸光度的降低(△A)建立一个标准曲线,且△A与C成线性关系,Y=0.0478X+0.6239,R=0.9997,测定的线性范围为4.830～21.13 mg,方法检出限为0.0262 mg/mL,相对标准偏差为3.2%。

Based on the fact that ethanol can be oxidized by acidic potassium permanganate solution and further reduce the absorbance of acidic potassium permanganate solution, a new method to measure ethanol content in liquor had been developed. The experimental results suggested that the standard curve could be established based on the amount of ethanol （C） and absorbance reduction （AA） of the acidic potassium permanganate solution, and the linear relations of AA and C was： Y=0.0478X＋0.6239, R=0.9997 in the range of4.830-21.13 mg with the detection limit of 0.0262 mg/mL, and the relative standard deviation was 3.2 %.