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对石墨炉原子吸收光谱法测定大米样品中镉的测试结果的不确定度进行评定,分析和量化了影响测量结果的系统效应和随机效应的不确定度分量。结果表明:当大米样品中镉的含量为0.184 mg/kg时,扩展不确定度为0.020 mg/kg(k=2)。
The uncertainty of the test results of the determination of cadmium in rice samples by graphite furnace atomic absorption spectrometry was evaluated, and the system effects and the uncertainty components of the random effects that affect the measurement results were analyzed and quantified. The results showed that the extended uncertainty was 0.020 mg / kg (k = 2) when the content of cadmium in rice samples was 0.184 mg / kg.