Combination of Instrumental Neutron Activation Analysis with X-Ray Fluorescence Spectrometry for the Determination of Rare-Earth Elements in Geological Samples

摘要

A combined use of comparator instrumental neutron activation analysis (INAA) including the internal standard method and energy-dispersive X-ray fluorescence spectrometry (EDXRF) for the determination of 14 rare-earth elements (REE) in geological samples at the level of their clarke concentrations is studied. A rapid analysis with the determination of light REE from La to Sm with Fe as an internal standard is performed using a portable RLP-21T energy-dispersive X-ray fluorescence spectrometer (Republic of Kazakhstan) with the excitation ofK-series lines of characteristic radiation of a sample with a low-power (10 W) X-ray tube with a tungsten anode and the maximum voltage 70 kV. The neutron activation analysis of other REE was performed using a WWR-K nuclear research reactor. Based on the analysis of ten certified reference materials of geological samples, a possibility of using a complex of INAA and EDXRF methods for routine qualitative analyses of REE in the III accuracy class in accordance with the branch standardOST41-08-212-04is shown. Examples of using a complex of INAA and EDXRF methods for solving geochemical problems and determining REE in out-of-balance ores of the Kundybay deposit are presented.