摘要
根据测量不确定度的评定原理和方法,对电位滴定法测定白酒中总酯含量过程的不确定度分量进行分析和定量,分析了测量重复性、取样、标准滴定液的标定过程、滴定管和摩尔质量等因素对测量不确定度的影响,建立了不确定度的数学模型。计算得到总酯的合成标准不确定度为uc=0.00836 g/L,扩展不确定度为U=0.0167 g/L;k=2。
The uncertainty components in the determination of total esters content in liquor by potentiometric titration were analyzed and quantified according to the evaluation principles of uncertainty.The effects of measurement repeatability,sampling,preparation process of standard solution,burette and molar weight etc on the uncertainty were also investigated to establish the mathematical model of uncertainty.The combined standard measurement uncertainty of total ester content was calculated to be 0.00836 g / L and the expanded uncertainty was 0.0167g / L（k = 2）.
出处
《酿酒科技》
北大核心
2012年第2期39-42,共4页
Liquor-Making Science & Technology
关键词
不确定度
电位滴定法
白酒
总酯
uncertainty
potentiometric titration method
liquor
total esters
