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Multielement x‐ray fluorescence spectrometry of solutions
Author(s) -
Budesinsky B. W.
Publication year - 1980
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.1300090106
Subject(s) - analytical chemistry (journal) , chemistry , partial least squares regression , constant (computer programming) , least squares function approximation , aqueous solution , nitric acid , fluorescence , multivariate statistics , mass spectrometry , relative standard deviation , mathematics , statistics , physics , optics , chromatography , inorganic chemistry , detection limit , computer science , estimator , programming language
The theoretical relationships between fluorescence intensity and concentration have been used for the calculation of correction constants of the Lachance‐‐Traill and Rasberry‐‐Heinrich equation for systems of solutions. The constants have also been calculated by means of the multivariate least‐‐squares method. Those two alternatives have been tested on systems of Cu‐‐Fe‐‐Zn and Cu‐‐Fe‐‐Zn‐‐Pb in 3.5% aqueous nitric acid and compared with the simple two‐variable linear relationship between fluorescence intensity and concentration. The multivariate least‐‐squares alternative gives for the Lachance‐‐Traill method very accurate results (average relative deviation does not exceed 0.18%). In a theoretical discussion, the relationship between optimum sample concentration and solvent correction (enhancement) constant is shown. The optimum conditions for a background reading are also calculated.