Abstract: The content of cadmium in flour was determined by graphite furnace atomic absorption spectrometry (GFAAS), and the sources of uncertainty were evaluated. Each parameter in mathematic model was analyzed to evaluate the type A and type B uncertainties in the method. To obtain the uncertainty evaluation, each uncertainty component was synthesized and extended by the current international method. The results showed that the major source of the uncertainty in the method was the sample solution volume and the standard curve.

Key words: uncertainty, cadmium, graphite furnace atomic absorption spectrometry