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X‐ray fluorescence analysis of natural phosphates
Author(s) -
Waňková J.,
Knob B.,
Moudrý F.,
Kuba M.
Publication year - 1982
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.1300110304
Subject(s) - calcination , mineralogy , chemical composition , chemistry , analytical chemistry (journal) , x ray fluorescence , phosphate , fluorescence , phosphorite , matrix (chemical analysis) , environmental chemistry , chromatography , physics , optics , biochemistry , organic chemistry , catalysis
An x‐ray fluorescence method was developed for the determination of P and Ca in raw phosphates. A modified mathematical method suggested by Lucas‐Tooth and Pyne was used to correct for matrix effects. The constants and influence coefficients in the algorithm were assessed using a set of 20 standard samples whose composition was determined by chemical analysis. The correspondence of P and Ca concentrations, as determined by the x‐ray method in samples from different deposits all over the world, with the results of chemical analysis can be characterized by the coefficient of variation v of the differences between the two methods. The value of v was 1.2% and 1.8% for P and Ca, respectively. The effects of a preliminary treatment of phosphates by calcination and of reducing the number of phosphate rock deposits, the samples of which are analysed, on the value of v are discussed.