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Accuracy of X‐ray fluorescence spectrometric determination of Rb and Sr concentrations in rock samples
Author(s) -
Th. Verdurmen E. A.
Publication year - 1977
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.1300060304
Subject(s) - analytical chemistry (journal) , isotope dilution , chemistry , x ray fluorescence , mica , absorption (acoustics) , fluorescence , matrix (chemical analysis) , isotope , dilution , mineralogy , x ray , crystal (programming language) , mass spectrometry , materials science , optics , chromatography , physics , quantum mechanics , composite material , thermodynamics , computer science , programming language
It is shown that application of the Compton scattering method for matrix correction in the X‐ray fluorescence spectrometric determination of the trace elements Rb and Sr in rock samples can provide concentrations at a relative accuracy level of 1%. The empirical method applies to rock samples showing differences in mass absorption up to a factor of two. The accuracy of the method has been tested by analysis of 57 samples analysed for Rb and Sr by mass spectrometric isotope dilution. In addition a few of the U.S. Geological Survey (U.S.G.S.) reference rock powders, showing significantly different mass absorption, were analysed for Rb and Sr. It is demonstrated that the mica effect, if significant, is smaller than 1% relative. There is no advantage in the use of the LiF(220) analysing crystal as a substitute for the LiF(200). The method appears to be insensitive to the pellet thickness.