气相色谱法测定婴幼儿乳粉中肌醇含量的不确定度评定

Uncertainty evaluation of determination of inositol in milk powder for infant by gas chromatography

中文关键词:  不确定度  气相色谱法  乳粉  肌醇

英文关键词:uncertainty evaluation  gas chromatography  milk powder  inositol

中文摘要:

      目的 分析气相色谱法测定婴幼儿乳粉中肌醇含量的不确定度。方法 通过分析与量化气相色谱法测定肌醇含量的实验过程, 对标准物质、样品处理过程、测量重复性及分析仪器4个方面进行不确定度分析, 建立不确定度的数学模型, 计算合成不确定度, 得到扩展不确定度和置信水平。结果 气相色谱法测定婴幼儿乳粉中肌醇含量的合成不确定度为0.94 mg/100 g, 扩展不确定度为1.88 mg/100 g, 乳粉中肌醇含量的测定结果为(65.5±1.88) mg/100 g。结论 本方法适用于婴幼儿乳粉中肌醇的不确定度分析, 通过揭示实际检测过程中不确定度的来源, 有效把握实验过程的质量控制, 提高检测结果的可靠性, 增强测量结果之间的可比性。

英文摘要:

      Objective To analyze the uncertainty of determination of inositol in milk powder for infant by gas chromatography. Methods The experiment of determination of inositol by gas chromatography was quantitatively analyzed, and the uncertainty was analyzed from 4 aspects, including standard substance, sample processing, measurement repeatability and analytical instruments. The mathematical model of the content was established, the synthetic uncertainty was calculated, and the expanded uncertainty and confidence level were evaluated. Results The synthetic uncertainty of determination of inositol in milk powder for infant by gas chromatography was 0.94 mg/100 g, the expanded uncertainty was 1.88 mg/100 g, and the result of inositol content was (65.5±1.88) mg/100 g. Conclusion This method is suitable for the uncertainty analysis of inositol in milk powder for infant. By revealing the source of the uncertainty in the actual detection process, it can effectively control the quality of the experimental process, improve the reliability of the testing result and enhance the comparability between the measured results.