Estimation of the uncertainty of Fe in metallic silicon determined by inductively coupled plasmas-atomic emission spectroscopy

This practice provides information for combining standard uncertainties of Fe in metallic silicon determined by the ICP-AES method of the China Inspection and Quarantine (CIQ). The measurand Fe% is determined from other quantities p.q.r . . . through a functional relationship of the model f: Fe% = f(p.q.r . . .). The estimated standard deviation associated with the output estimate Fe%, called combined standard uncertainty and denoted by u_c (Fe%), is determined from the estimated standard deviation associated with each larger input estimate (p.q.r . . .). The combined variance u_c² (Fe%) can be viewed, by the sensitivity coefficients, as a sum of terms with the minor errors omitted.