食醋中游离矿酸测定结果的不确定度评定  

Uncertainty Evaluation of Free Mineral Acid Measurement in Vinegar

作　　者：崔丽伟[1] 白静 

机构地区：[1]河南牧业经济学院,郑州450011 [2]河南应用技术职业学院,郑州450042

出　　处：《中国调味品》2017年第5期119-122,共4页China Condiment

摘　　要：建立预设终点电位滴定法测定食醋中游离矿酸的不确定度的数学模型,从测量过程各步骤分析不确定度来源并量化。测定结果的主要不确定度因素有标准溶液的配制、消耗标准溶液的体积和电位滴定的定量重复性。结果表明样品中游离矿酸在(2.356×10^(-3)±1.767×10^(-5))mol/L区间内包含真值的概率约为95%。A mathematical model is established to assess the uneertainty for detection of free mineral acid concentration in vinegar by the preset destination potentiometric titration method. Various sources of uncertainty from the detection procedure are assessed. The major factors of measurement uncertainty are the configuration of standard solution, the consumption volume of standard solution and the quantitative repeatability of potentiometrie titration. The result shows that the probability of the true value in the range of （2. 356×10^-3±1.767×10^-5） mol/L is 95%.

关 键 词：食醋 游离矿酸 不确定度 

分 类 号：TS264.22[轻工技术与工程—发酵工程]