Study on estimation of uncertainty in measurement of cadmium element in plastics

A novel method was established to estimate the uncertainty in the measrement of Cadmium in plastics by Flame Atomic Absorption Spectrometry(FAAS) based on the repeatability and bias data within laboratory in this paper.A representative range of samples covering typical matrices and Cadmium concentration levels were employed to investigate the whole method performance parameters of method precision and method recovery,and the measurement uncertainty of both parameters were calculated,respectively,and then combined.The results reveal that the individual uncertainty of precision and recovery is,respectively,0.026 and 0.068,the combined measurement uncertainty is 0.072,and the expanded uncertainty is 0.14.This procedure of estimation of measurement uncertainty provides a new method for estimation of measurement uncertainty for analytical laboratory,and it is simple,reasonable and the result is reliable.