Estimation of the Uncertainty of Fe in Metallic Silicon Determined by Inductively Coupled Plasmas-Atomic Emission Spectroscopy

摘要

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 percent is determined from other quantities p.q.r ... through a functional relationship of the model /: Fe percent = f(p.q.r...). The estimated standard deviation associated with the output estimate Fe percent, called combined standard uncertainty and denoted by u_c (Fe percent), is determined from the estimated standard deviation associated with each larger input estimate (p.q.r...). The combined variance u_c (Fe percent) can be viewed, by the sensitivity coefficients, as a sum of terms with the minor errors omitted.