The most typical interfering species in flamephotometric determination of calcium are sulphuric acid, phosphoric acid, and aluminium. In the previous reports by the other authors, it has been proved that the formations of some refractory compounds of these species in light sources decrease the emission intensity of calcium spectrum line. A chelate formation of EDTA in solution has been proved effective in the elimination of sulphate and phosphate interferences. But in the case of aluminium, it was not successful. In this report strong fluoride complex of aluminium is proved to be effective in the elimination of the formation of refractory material calcium aluminate.
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