鸡精调味料中谷氨酸钠测定的不确定度分析

Uncertainty analysis of determination of sodium glutamate in chicken seasoning

中文关键词:  鸡精  谷氨酸钠  不确定度

英文关键词:chicken seasoning  monosodium glutamate  uncertainty

中文摘要:

      目的 分析测定鸡精中谷氨酸钠的不确定度来源, 对不确定度的各个分量进行评估和合成。 方法 根据 JJF 1059.1-2012《测量不确定度评定与表示》, 采用标准 SB/T 10371-2003《鸡精调味料》中规定方法进行谷氨酸钠的测定。结合实验室日常检测能力和条件, 找出影响测定结果的不确定度的因素, 通过建立数学模型对各个不确定度分量进行评估和合成。结果 不确定度主要来源有标准溶液、样品质量、样品溶液、重复性、滴定溶液的体积; 当鸡精中谷氨酸钠的测定值为40.94 g/100 g时, 扩展不确定度为0.29 g/100 g, 测定结果表示为(40.94±0.29) g/100 g, k=2, P=95%。结论 鸡精调味料中谷氨酸钠测定的扩展不确定度为 0.29 g/100 g, 符合标准要求。

英文摘要:

      Objective To analyze and determine the source of uncertainty of sodium glutamate in chicken essence, evaluated and synthesized the components of uncertainty. Methods According to JJF 1059.1-2012 Measurement Uncertainty Evaluation and Representation, the determination of sodium glutamate was carried out according to the method specified in the standard SB/T 10371-2003 Chicken Seasoning. The factors affecting the uncertainty of the measurement results were found out with the daily testing capabilities and conditions of the laboratory, and the various uncertainty components were evaluated and synthesized by establishing a mathematical model. Results The main sources of uncertainty are: standard solution, sample quality, sample solution, repeatability and volume of titration solution. When the determination value of sodium glutamate in chicken essence was 40.94 g/100 g, the expanded uncertainty was 0.29 g/100 g. The determination results were (40.94±0.29) g/100 g, k=2, P=95%. Conclusion The expanded uncertainty is 0.29 g/100 g, which meets the standard requirement of sodium glutamate detection in chicken seasoning.