STUDY OF STANDART SAMPLES TESTED FOR Au AND Ag CONTENT FOR USE IN NEUTRON-ACTIVATION ANALYSES BY THE RELATIVE METHOD

The article presents the results of the study of the content and distribution of Au and Ag in the available standard samples (CRMs.). The studies were carried out by the method of instrumental neutron activation analysis (INAA) for Au and Ag by multiple parallel small samples (mass 100 mg). In addition, by X-ray fluorescence analysis (XRF) on energy dispersive spectrometer the Ag content in large (7-10 g) samples was studied. The results of statistical processing of parallel measurements are given, the convergence of the results for 100 mg suspensions separately for each defined element is studied. Comparison of used instrumental methods for determination of Ag is carried out. Quality control for each method is given. The limits of application of these CRMs for use in the INAA method are determined.