Determination of fluorine in coal by wavelength dispersive X-ray fluorescence spectrometry with pressed powder pellet
LIU Lin, WANG Yong, ZENG Hui, SHI Zong-you
Product Quality Supervision and Testing Institute of Panzhihua, National Quality Supervision and Testing Center of Vanadium and Titanium Products, Panzhihua 617000, China
Abstract：The rapid and accurate determination of fluorine content in coal has important significance for production control and investigation of distribution law of fluorine in coal in China. The samples were grinded to the particle size less than 74μm. After edging with boric acid, the sample was prepared to pressed powder pellet at pressure of 35t for 25s. The matrix effect was corrected by the empirical coefficient method. The determination method of fluorine content in coal by wavelength dispersive X-ray fluorescence spectrometry (WDXRF) with pressed powder pellet was established. The calibration curve was plotted using the certified reference materials of coal with different content of fluorine (the mass fraction was in range of 37-1496mg/kg). The linear correlation coefficient of standard curve was 0.9998. The detection limit of method was 3mg/kg. Three actual samples of coal with different content of fluorine were determined for ten times according to the experimental method. The average of found results was basically consistent with that obtained by high temperature combustion hydrolysis-fluoride ion selective electrode method in national standard method GB/T 4633-2014. The relative standard deviations (RSD, n=10) were between 1.9% and 3.5%. The proposed method was applied for the determination of fluorine content in standard samples of coal, and the found result were basically consistent with the certified values.
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