Abstract
A method for the flame photometric determination of calcium in tantalum was taken in a quartz boat, covered by graphite powder and placed in a Pyrex combustion tube. The temperature was raised gradually to about 430°C in a stream of hydrogen chloride (150 ml /min) and matrix tantalum was sublimed off as tantalum chloride. The residue was taken up with hydrochloric acid and filtered. The filtrate was concentrated by evaporation, transfered to a 10 ml volumetric flask and diluted to the mark with water.Two 10 ml aliquots of this solution were transfered to a couple of 10 ml volumetric flasks, to which were then added 1 ml of lanthanum chloride solution (10mg/ ml) and 4 ml of ethanol. A definite volume of standard calcium solution was added to one of the flasks, and calcium was determined flame-photometrically with oxy-hydrogen flame and at wavelength 422. 7 mμ by standard addition method.
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