Uncertainty Evaluation of Determining Chromium Content in Rice by Graphite Furnace-AAS
The objective of this study was to evaluate the uncertainty of determining chromium in rice by the graphite furnace atomic absorption spectrometry method and find out elements affecting the uncertainty.It can provide evidences for evaluating the determination reports.The uncertainty source was analyzed according to Evaluation and Representation of Determination Uncertainty(JJF1059-1999).Results showed the content of chromium in rice was 0.11 mg/kg,and the expanded uncertainty was 0.02 mg/kg(k=2).Conclusion was the uncertainty of this determination was produced in the process of samples treatment and relative standard deviation of measuring result.