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A system for routine analysis of chlorine, sulphur, potassium and calcium in brine by X‐ray fluorescence spectrometry applying theoretical matrix corrections
Author(s) -
van den Enk Jan E.,
Janssen Jan J.,
de Jongh Willy K.
Publication year - 1976
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.1300050205
Subject(s) - analytical chemistry (journal) , chemistry , chlorine , brine , x ray fluorescence , matrix (chemical analysis) , mass spectrometry , potassium , spectrometer , calibration , fluorescence , chromatography , physics , optics , organic chemistry , quantum mechanics
A rapid procedure for the accurate determination of Cl, SO 4 , K and Ca in brines has been developed. The brine sample as received is put into a liquid sample holder and analysed by the PW 1410 X‐ray spectrometer with a helium attachment. The data are processed by an on‐line desk calculator HP 9830A. The elements mentioned strongly influence each other's X‐ray intensities and, consequently, matrix corrections have to be applied. The influence coefficients used for corrections are derived from physical data and give excellent results in that all calibration equations are perfectly linearized. The two instrument‐dependent calibration constants for each element are very stable in time and agree well between our three instruments of the same type. This stability is ensured by applying a monitor standard (pressed powder); thus, the occasional recalibration work is minimized. The precision for each element is better than 0.4% relative at a 95% confidence level and for a measuring time of about forty seconds per element. The calculated concentrations are in weight fractions, which are finally transformed to grams/litre or equivalents/litre. The specific gravity required for this transformation is calculated from the weight fractions.