Evaluation of Uncertainty for the Determination of Cadmium Content in Wheat flour
To explore the factors affecting the uncertainty of the determination of cadmium content in wheat flour by graphite furnace atomic absorption spectrometry,and to evaluate the uncertainty.Determine the cadmium content in wheat flour according to relevant standards,and establish a mathematical model.Then analyze and calculate the uncertainty from the preparation of standard solution configuration,the fitting of standard working curves(calibration curves),samples weighing,volume determination after samples digestion,the repeated determination of samples and the pretreatment of samples.The cadmium content in wheat flour was 0.022 mg/kg,obtained the result of the expanded uncertainty was 0.002 3 mg/kg(k=2).The uncertainty introduced by fitting standard working during the measurement process had the greatest impact.
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