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<p>This document specifies a wavelength-dispersive X-ray fluorescence spectrometric (XRF) method for the determination of cryolite (Na<sub>3</sub>AlF<sub>6</sub>) from the content of fluorine to the content of trace elements. The calibration reference materials are not specified in this method.</p>
<p>The method is applicable to cryolite, which is primarily used for the production of aluminium. Annex A provides conversion factors for converting elements to compounds. The validity and precision of test results for concentrations outside these ranges has not been determined.</p>
<p>The concentration range of fluorine (given as F) is from 510 g/kg to 560 g/kg. The concentration range of aluminium (given as Al) is from 120 g/kg to 150 g/kg. The concentration range of sodium (given as Na) is from 270 g/kg to 330 g/kg. The concentration range of silicon (given as SiO<sub>2</sub>) is from the lowest limit of detection (LLD) to 4,0 g/kg. The concentration range of iron (given as Fe<sub>2</sub>O<sub>3</sub>) is from LLD to 0,37 g/kg. The concentration range of sulfur (given as SO<sub>4</sub>) is from LLD to 5,0 g/kg. The concentration range of phosphorus (given as P<sub>2</sub>O<sub>5</sub>) is from LLD to 0,40 g/kg. The concentration range of calcium (given as CaO) is from LLD to 0,80 g/kg.</p>
Reģistrācijas numurs (WIID)
79970
Darbības sfēra
<p>This document specifies a wavelength-dispersive X-ray fluorescence spectrometric (XRF) method for the determination of cryolite (Na<sub>3</sub>AlF<sub>6</sub>) from the content of fluorine to the content of trace elements. The calibration reference materials are not specified in this method.</p>
<p>The method is applicable to cryolite, which is primarily used for the production of aluminium. Annex A provides conversion factors for converting elements to compounds. The validity and precision of test results for concentrations outside these ranges has not been determined.</p>
<p>The concentration range of fluorine (given as F) is from 510 g/kg to 560 g/kg. The concentration range of aluminium (given as Al) is from 120 g/kg to 150 g/kg. The concentration range of sodium (given as Na) is from 270 g/kg to 330 g/kg. The concentration range of silicon (given as SiO<sub>2</sub>) is from the lowest limit of detection (LLD) to 4,0 g/kg. The concentration range of iron (given as Fe<sub>2</sub>O<sub>3</sub>) is from LLD to 0,37 g/kg. The concentration range of sulfur (given as SO<sub>4</sub>) is from LLD to 5,0 g/kg. The concentration range of phosphorus (given as P<sub>2</sub>O<sub>5</sub>) is from LLD to 0,40 g/kg. The concentration range of calcium (given as CaO) is from LLD to 0,80 g/kg.</p>
