微波消解-原子荧光法测定大米粉中总砷含量的不确定度评定  

Uncertainty evaluation for the determination of total arsenic in rice by atomic fluorescence spectrometry with microwave digestion

作　　者：郑超 包蕾[1] 李旭东[1] 向正华[1] 薛亚东[1] 马惘卿 吴林蔚 ZHENG Chao;BAO Lei;LI Xu-Dong;XIANG Zheng-Hua;XUE Ya-Dong;MA Wang-Qing;WU Lin-Wei(Yuxi Center for Disease Control and Prevention,Yuxi 653100,China)

机构地区：[1]玉溪市疾病预防控制中心

出　　处：《食品安全质量检测学报》2019年第22期7622-7628,共7页Journal of Food Safety and Quality

摘　　要：目的评定微波消解-原子荧光法测定大米粉中总砷含量的不确定度。方法依据JJF 1059.1-2012《测量不确定度评定与表示》及CNAS-GL 006-2019《化学分析中不确定度的评估指南》,采用微波消解-原子荧光法测定大米粉质控样品中总砷含量,建立数学模型,并对整个分析过程中产生的不确定度分量进行评定。结果当大米粉质控样品中砷测定结果为0.156mg/kg时,其扩展不确定度为0.0067mg/kg(*=2)_结论量化后测定过程中各影响因素所产生的不确定度表明实验过程的不确定度主要来源于标准曲线拟合,其次是加标回收率及测量重复性。Objective To evaluate the uncertainty of determination of total arsenic content in rice flour bymicrowave digestion-atomic fluorescence spectrometry. Methods According to JJF 1059.1-2012 Measurementuncertainty evaluation and expression and CNAS-GL 006-2019 Evaluation guide fo r uncertainty in chemicalanalysis, the content of total arsenic in rice flour quality control samples was determined by microwavedigestion-atomic fluorescence spectrometry, a mathematical model was established, and the uncertaintycomponents generated in the whole analysis process were evaluated. Results When the arsenic determinationresult of the quality control samples of rice flour was 0.156 mg/kg, the expansion uncertainty was 0.0067 mg/kg,k=2. Conclusion The uncertainty caused by the influencing factors in the measurement process after quantificationindicates that the uncertainty of the experimental process mainly comes from the standard curve fitting, followed bythe spiked recovery rate and measurement repeatability.

关 键 词：微波消解 原子荧光法 砷 不确定度 

分 类 号：TS2[轻工技术与工程—食品科学与工程]