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LC-AFS法测定明胶中砷含量的不确定度评定

Evaluation of uncertainty in determination of arsenic content in gelatin by LC-AFS method
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摘要 建立一种液相色谱原子荧光光谱法测定食品添加剂明胶中砷含量的不确定度的评定方法。利用液相色谱原子荧光光谱法对食品添加剂明胶中砷的含量测定,依据JJF1059.1-2012《测量不确定度评定与表示》分析明胶中砷的含量,建立不确定度评定的数学模型,分析测量过程中的不确定度因素,通过样品重复测定、标准溶液纯度、标准曲线、玻璃器具、称量过程、回收率、检测仪器对检测结果不确定度进行评定,并且进行计算。按置信区间为95%,明胶中砷的含量为(0.120±0.012)mg/kg,k=2。建立了液相色谱原子荧光光谱法测定食品添加剂明胶中砷含量的不确定度的评定方法,最终确定食品添加剂明胶中砷的含量测定结果的不确定度来源主要有:砷标准溶液建立的标准曲线的拟合、回收率,明确检测明胶中砷含量过程中带来的各种不确定度评定因素的占比,并且进行了分析,提出了改进的方法。 To establish an uncertainty evaluation method for the determination of arsenic content in food additive gelatin by liquid chromatography atomic fluorescence spectrometry.Liquid chromatography atomic fluorescence spectrometry was used to determine the content of arsenic in food additive gelatin.The arsenic content in gelatin was analyzed according to JJF1059.1-2012 Evaluation and Expression of Measurement Uncertainty,and a mathematical model for uncertainty evaluation was established.The uncertainty factors during the measurement process were analyzed.Samples were repeatedly measured,standard solution purity,standard curve,glassware,weighing process,recovery rate The testing instrument evaluates the uncertainty of the testing results and calculates them.According to the confidence interval of 95%,the arsenic content in gelatin is(0.120±0.012)mg/kg,k=2.A method for evaluating the uncertainty of the determination of arsenic content in food additive gelatin by liquid chromatography atomic fluorescence spectrometry has been established.The main sources of uncertainty in the determination of arsenic content in food additive gelatin are the fitting of the standard curve established by the arsenic standard solution,the recovery rate,and the proportion of various uncertainty evaluation factors brought about by the detection of arsenic content in gelatin.Analysis has been conducted and proposed improved methods.
作者 李俊东 崔婷婷 LI Jundong;CUI Tingting(Hohhot Natural Resources Comprehensive Survey Center of China Geological Survey,Hohhot 010000,China)
出处 《中国测试》 CAS 北大核心 2023年第S01期139-144,共6页 China Measurement & Test
关键词 液相色谱原子荧光光谱仪 明胶 不确定度 liquid chromatography atomic fluorescence spectrometer gelatin arsenic uncertainty
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