湿法消解-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 for the Determination of Cadmium Content in Rice by Wet Digestion Combined with Graphite Furnace Atomic Absorption Spectrometry
摘要
采用湿法消解结合石墨炉原子吸收光谱法对大米中镉含量进行定量分析,系统评估了测量过程中各不确定度分量的影响并予以量化,在此基础上合成得到扩展不确定度.结果表明:消解过程引入的不确定度贡献最大;其次是标准溶液、标准曲线拟合过程引入的不确定度;称量和定容带来的不确定度影响较小,可以忽略不计.最后得出大米中镉含量为0.164 mg/kg,其扩展不确定度为0.0060 mg/kg(k=2).
The cadmium content in rice was quantitatively analyzed using wet digestion combined with graphite fur-nace atomic absorption spectrometry.The influences of various uncertainty components in the measurement process were systematically evaluated and quantified,and the uncertainty components were combined to obtain the expand-ed uncertainty on this basis.The results indicated that the uncertainty introduced by the digestion process made the largest contribution,followed by the uncertainties introduced by the standard solution and the calibration curve fit-ting process.The uncertainties introduced by weighing and volume adjustment were relatively small and could be neglected.The cadmium content in the rice was determined to be 0.164 mg/kg,with an expanded uncertainty of 0.0060 mg/kg(k=2).
年，卷(期)：
2026, 55(4)
分类号：
TS210
机标分类号：
O6
TB9
TH744.5
在线出版日期：
2026年9月15日
基金项目：
DS2021011:储备大米品控和溯源工作室，
