电感耦合等离子光谱法测定婴幼儿营养米粉中铁含量的不确定度评定  

Evaluation of uncertainty for determination of iron content in infant nutritious rice flour by ICP-OES

作　　者：熊小辉 戴瑞平 刘花梅 Xiong Xiaohui;Dai Ruiping;Liu Huamei(Jiangxi Institute for Food Control,Nanchang 330001,China)

机构地区：[1]江西省食品检验检测研究院,南昌330001

出　　处：《分析仪器》2020年第2期104-109,共6页Analytical Instrumentation

摘　　要：以婴幼儿营养米粉为例,根据食品安全国家标准GB5009.268-2016《食品中多元素的测定》中电感耦合等离子体光谱法(ICP-OES)测定营养米粉中的铁含量,分析测试过程中引起不确定度的因素,对涉及到的标准物质,设备仪器,玻璃器皿不确定度的来源进行详细分析和计算。通过实验研究发现,对实验结果影响最大的是标准物质溶液的配制,其引起的相对标准不确定度为0.0542;其次是标准曲线最小二乘法拟合计算浓度,其引起的相对标准不确定度为0.0215。样品称量、样品溶液定容、加标回收、样品重复测定对实验结果影响较小。该研究中ICP-OES法测定婴幼儿米粉铁含量不确定度报告为(58.3±6.9)mg/kg(k=2)。The determination was according to the national food safety standard GB5009.268-2016 Determination of Multicomponents in Food.The study analyzed and calculated the sources of uncertainty.The experimental results showed that the most important affecting factor was the formulation of reference material solution.The relative standard uncertainty was 0.0542.The second factor was the concentration calculated by the least square fitting method of the standard curve,the relative standard uncertainty was 0.0215.Sample weighing,sample solution volumetric determination,standard addition recovery and sample repeated determination had little influence on the experimental results.The uncertainty of the determination of iron content in infant nutritious rice flour by ICP-OES was(58.3±6.9)mg/kg(k=2).

关 键 词：不确定度 电感耦合等离子体光谱仪 铁含量 评定 

分 类 号：TS216[轻工技术与工程—粮食、油脂及植物蛋白工程] O657.3[轻工技术与工程—食品科学与工程]