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目的评定原子吸收分光光度计法(atomic absorption spectroscopy,AAS)测定圆白菜中的镉含量的不确定度。方法依据JJF 1059.1-2012《测量不确定度评定与表示》,分析整个检测过程中所产生的不确定度来源,计算合成不确定度。结果计算得出圆白菜中镉的含量为0.036 mg/kg,扩展不确定度为0.0046 mg/kg(包含因子k=2)。结论可通过控制标准曲线校准过程和加强对仪器的维护保养等措施来减小原子吸收分光光度法测定圆白菜中镉含量的不确定度,保证实验数据的可靠性,为检测报告提供有力依据。
Objective To assess the uncertainty of determination of cadmium in cabbage by atomic absorption spectroscopy (AAS). Methods According to JJF 1059.1-2012 Evaluation and Expression of Measurement Uncertainty, the source of the uncertainty generated in the whole detection process was analyzed to calculate the synthesis uncertainty. Results The calculated Cd content in cabbages was 0.036 mg / kg with an expanded uncertainty of 0.0046 mg / kg (including factor k = 2). Conclusion The uncertainty of the determination of cadmium content in cabbage by atomic absorption spectrophotometry can be reduced by controlling the calibration curve of standard curve and strengthening the maintenance of the instrument, so as to ensure the reliability of the experimental data and provide a strong basis for the test report.