提高用阿贝折射仪测定乙醇含量的准确度

An Investigation on Increasing Accurcy of Alcohol Content Measurement by Abbe Refractometer

为了提高用阿贝折射仪测定乙醇含量的准确度,分别研究了在同一条件下乙醇摩尔浓度、质量分数、摩尔分数与其折射率之间的关系。结果表明:乙醇水溶液的摩尔浓度、质量分数、摩尔分数与其折射率的相关程度递减。用乙醇的摩尔浓度、质量分数、摩尔分数分别与其折射率绘制标准曲线,从三种标准曲线上测得的乙醇含量的准确度也递减。摩尔浓度的检测限为0～10 mol/L左右,质量分数检测限为0～51％左右,摩尔分数检测限为0～29％左右。

For the benefit of increasing accuracy of alcohol content measurement by Abbe refractome-ter, this paper makes a study of the relationship between refractive indexs and molecular strength, weigh percentage and molecular percentage under the same condition. The findings is that the relationship of molecular strength, weight percentage, and molecular percentage of alcohol solution betweent its refractive indexes shows a correlative decrease and that the accuracy of alcohol content measurement also shows a decrease based on the three standard curves drawn between the refractive index and the known molecular strength, weight percentage and molecular percentage of alcohol. The measuring range of molecular strength is about 0 - 10 mol · L-1, weight percentage about 0 - 51 % , molecular percentage about 0 - 29% .