Uncertainty Evaluation of Ethanol Content Detection in Huoxiang Zhengqi Tincture by Gas Chromatography
The ethanol content in Huoxiang Zhengqi tincture was determined by gas chromatography,and the uncertainty for the measurement results was evaluated.A mathematical model of uncertainty in ethanol content detection by gas chromatography was established,and the factors affecting measurement uncertainty were analyzed,including the purity of anhydrous ethanol,the pipetting and constant volume of standard solution and sample solution,the repeatability of measurement,and the instrument.The synthetic standard uncertainty and expanded uncertainty were calculated.The results showed that when the ethanol content in Huoxiang Zhengqi tincture was 47.44%,the expanded uncertainty was 0.50%(k=2,P=95%).The main sources of measurement uncertainty were the pipetting and constant volume of the standard solution and sample solution.The accuracy of the measurement results cloud be improved by selecting the glass gauge with higher precision and controlling the constant volume temperature close to 20℃.
万方数据
维普
