Premium
A self‐consistent calibration method for industrial X‐ray spectrometric analyses
Author(s) -
Tertian R.
Publication year - 1975
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.1300040204
Subject(s) - borax , calibration , range (aeronautics) , algorithm , analytical chemistry (journal) , series (stratigraphy) , calibration curve , mathematics , materials science , computer science , biological system , chemistry , raw material , statistics , chromatography , geology , detection limit , paleontology , organic chemistry , composite material , biology
A fast, efficient calibration procedure is proposed based on the accurate analysis of multicomponent systems by means of the influence coefficient method. It relies on a series of well designed additions made to a suitable standard composition, the latter also being used as a reference sample. We show that, for an n element composition, using the hypothesis of constant coefficients, ( n + 1) preparations – allowing n ( n + 1) intensity measurements – are in principle sufficient to calculate the n 2 calibration parameters [i.e. n ( n − 1) influence coefficients and n referenc relative intensities] which are necessary for a complete analysis. Actual analyses are carried out by measuring the fluorescent intensities using the ratio (i.e. unknown/standard) method, and then calculating the concentrations from the usual relationships through an iterative calculation, preferably executed by a computer program. A detailed description of a typical application is given, which involved the study of fused specimens (borax fusion) of bauxite and resulted in the very accurate analysis of calcined samples, as well as the direct analysis of raw bauxites following an adequate treatment of the ignition loss problem. While the method is immediately applicable to every system studied in either solid or liquid solution, it clearly extends to compact systems over a suitable compositional range, provided that carefully controlled additions can be achieved and that all prepared samples are homogeneous.