X-ray fluorescence determination of total sulfur in fly ash |
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Authors: | Vít prta Bohumil Knob and P Jano |
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Institution: | (1) Research Institute of Inorganic Chemistry, Revoluční 84, CZ-400 01 ústí nad Labem, Czech Republic, XX |
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Abstract: | Standard addition, double dilution and standard calibration were used for x-ray fluorescence (XRF) determinations of sulfur
in fly ashes. Samples were analysed as pellets prepared by mixing with acrylate copolymer or with microcrystalline cellulose
(in the case of the double dilution method). Lithium sulfate was used for the standard addition method and also as standard
with known sulfur content for the double dilution method. Fly ashes analysed by optical emission spectrometry with an inductively
coupled plasma (ICP-OES) were used as standards for the standard calibration XRF method. Sulfur was determined in the range
of ca. 10–1–100 % S. For the fly ashes from the North-Bohemian brown coals, the differences between the XRF determinations and the ICP-OES
determinations ranged from ca. 1.4 to 10% rel. and precision (repeatability) was better than 10% (RSD). The standard calibration
method is suitable for routine analyses of real samples of similar nature. The methods of standard addition and double dilution
are rather laborious in sample preparation compared with the standard calibration.
Received: 27 October 1998 / Revised: 5 March 1999 / Accepted: 11 March 1999 |
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