压力罐消解-石墨炉原子吸收光谱法测定大米中镉含量的不确定度评定  

Uncertainty Evaluation of Cadmium Content in Rice by Pressure Tank Digestion-Graphite Furnace Atomic Absorption Spectrometry

作　　者：盛雪 赵昱玮 SHENG Xue;ZHAO Yuwei(Changchun Chaoyang District Center for Disease Control and Prevention(Changchun Chaoyang District Health Supervision Institute),Changchun 130021,China;The Affiliated Hospital of Changchun University of Chinese Medicine,Changchun 130021,China)

机构地区：[1]长春市朝阳区疾病预防控制中心(长春市朝阳区卫生监督所),吉林长春130021 [2]长春中医药大学附属医院,吉林长春130021

出　　处：《现代食品》2025年第1期200-204,共5页Modern Food

摘　　要：采用压力罐消解-石墨炉原子吸收光谱法测定大米中的镉含量,并进行不确定度评定。参照《食品安全国家标准食品中镉的测定》(GB 5009.15—2023)第一法进行大米中镉含量测定;依据《测量不确定度评定与表示》(JJF 1059.1—2012)和《化学分析中不确定度的评估指南》(CNAS-GL 006:2019),量化分析测量过程中引入的不确定度。结果表明,大米中的镉含量为0.142 mg·kg^(-1),扩展不确定度为0.005 mg·kg^(-1)(k=2)。测量过程中的不确定度主要来源于标准曲线的绘制、样品处理过程、重复性实验和仪器设备的检定,而样品称量过程及样品消解后的溶液定容过程引入的不确定度较小。The cadmium content in rice was determined by pressure tank digestion-graphite furnace atomic absorption spectrometry,and the uncertainty was evaluated.The cadmium content in rice was determined according to the first method of GB 5009.15—2023.According to JJF 1059.1—2012 and CNAS-GL 006:2019,the uncertainty introduced in the measurement process is quantified.The results showed that the cadmium content in rice was 0.142 mg·kg^(-1),and the extended uncertainty was 0.005 mg·kg^(-1)(k=2).The uncertainty in the measurement process mainly comes from the drawing of standard curves,sample processing process,repeatability experiment and the verification of instruments and equipment,while the uncertainty introduced by the sample weighing process and the solution volume determination process after sample digestion is small.

关 键 词：压力罐消解 石墨炉原子吸收光谱法 大米 镉 不确定度 

分 类 号：O657.63[理学—分析化学] TS210.7[理学—化学]