火焰原子吸收光谱法测定婴儿配方奶粉中钾含量的不确定度评定  

Evaluation of uncertainty for determination of potassium in infant formula by FAAS

作　　者：刘紫譞[1] 蔡义珊 吴赞[1] 姜雪成 贾丽[1] 钱春燕[1] Liu Zixuan;Cai Yishan;Wu Zan;Jiang Xuecheng;Jia Li;Qian Chunyan(Beijing Center for Physical and Chemical Analysis,Beijing Engineering Research Center of Food Safety Analysis,Beijing 100089,China)

机构地区：[1]北京市理化分析测试中心北京市食品安全分析测试工程技术研究中心,北京100089

出　　处：《分析仪器》2018年第6期92-95,共4页Analytical Instrumentation

基　　金：北京市改革与发展自立课题(2018ZL0101)

摘　　要：依据GB 5009.91—2017标准,以火焰原子吸收光谱法测定婴儿配方奶粉中钾的含量,同时建立数学模型、对测定结果的不确定来源进行分析并计算其扩展不确定度。结果表明:当婴儿配方奶粉中钾含量为444mg/100g时,在95%的置信区间下,其扩展不确定度为15mg/100g(k=2)。评定结果表明,拟合工作曲线求得样品溶液中钾浓度时引入的不确定贡献最大。The determination was according to GB5009.91-2017. Meanwhile,the mathematical model was established to analyze the sources of the uncertainty. Furthermore,the extended uncertainty of the measurement results was calculated under the condition of 95% confidence level. The results showed that the potassium in infant formula beverage was 444mg/100g, while the expanded uncertainty was 15mg/ 100g（k=2）. The uncertainty mainly came from the calculation for the concentration of potassium in the sample solution by referring to the calibration curve.

关 键 词：火焰原子吸收光谱法 婴儿配方奶粉 不确定度 钾 

分 类 号：O657.31[理学—分析化学]