Abstract: A mathematic model for evaluating the uncertainty of the determination procedure for Cadmium in dried mushroom by ICP-AES was established. The uncertainty sources for each of the parameters in the model were analyzed. The uncertainties of type A (based on the calculation of the statistical distribution of the determination results) or type B (based on the estimation by experience and the probability distribution of other information) were evaluated. According to the international general method, the component uncertainties were synthesized and extended respectively to obtain the uncertainty evaluation. The results showed that the preparation of standard solutions, the fitted linear regression equation for the calibration curve and the volume of sample solution are the main sources of uncertainties.

Key words: ICP-AES, dried mushroom, cadmium, uncertainty