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建立有效的数学模型,全面分析了微波消解石墨炉原子吸收光谱法测定山药中镉不确定度的主要来源,并系统地评定各因素的不确定度。结果表明,对于山药中镉含量为25.12μg/kg的样品,扩展不确定度为3.47μg/kg(k=2),最终测量结果表示为25.12±3.47μg/kg。影响最终不确定度的主要有标准溶液配制、测量重复性及样品回收率3个分量,而称重和消解液的定容过程对结果影响较小。通过对测量的不确定度评定,为有效地控制山药中镉含量的检测提供可靠的理论依据。
The establishment of an effective mathematical model, a comprehensive analysis of microwave digestion Graphite Furnace Atomic Absorption Spectrometry Determination of the main sources of uncertainty in yam cadmium, and systematically assess the uncertainty of the various factors. The results showed that the extended uncertainty of 3.47μg / kg (k = 2) was obtained for the yam samples with the content of 25.12μg / kg and the final measurement was 25.12 ± 3.47μg / kg. The main factors affecting the final uncertainty of the standard solution preparation, measurement repeatability and sample recovery rate of three components, and weighing and digestion solution volumetric process has little effect on the results. By assessing the uncertainty of measurement, it provides a reliable theoretical basis for the effective control of the detection of cadmium in yam.