Abstract:

Using wet digestion sample，a method was developed for determination of copper，iron and zinc elements in golden jewelry by ICP-AES method.The method has the advantages of accurate，simple，sensitive and rapid.Based on the measuring principle，the calculation formula was deduced，some data were collected in the procedure of analyzing the golden sample and the various uncertainties in measurement were calculated.According to the international general method，the component uncertainties were synthesized and extended，respectively to obtain the uncertainty evaluation.The results showed that the sources of uncertainty were comprised of sample weighing，the preparation of standard solutions，the fitted linear regression equation for the calibration curve and the repeated determination of copper，iron and zinc concentration in golden jewelry decomposed solution.The combined standard uncertainty and expanded uncertainty of copper，iron and zinc concentration were showed （10.42±1.54），（10.79±1.21） and （26.89±1.88） mg/kg respectively.

Key words: ICP-AES method, Golden jewelry, Copper, Iron, Zinc, Uncertainty