摘要
分析了石墨炉原子吸收光谱法测定大米中镉含量不确定度的各分量,对其测量不确定度进行合理的评定,结果表明:大米样品中镉的含量为0.18 mg/kg时,其扩展不确定度为0.01 mg/kg(k=2),不确定度主要是最小二乘法拟合标准工作曲线求得样品浓度过程和测试过程随机效应引入的。
The sources affecting uncertainty in determination of cadmium in rice by GFAAS were analyzed and evaluated. The evaluation indicated that the expanded uncertainty was 0.0097 mg/kg （k= 2） when the Cd content in rice sample was 0.18 mg/kg. The major sources of uncertainty were the least square fitting of the working curve and the random effects during testing process.
出处
《福建分析测试》
CAS
2014年第1期59-62,共4页
Fujian Analysis & Testing
关键词
石墨炉原子吸收分光光度计
大米
镉
不确定度
Graphite Furnace Atomic Absorption Spectrometry （GFAAS）
Rice
Cadmium
Uncertainty of Measurement
