炎光分光光電光度計によるCa,Mgの同時定量法

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Method for simultaneous determination of Ca and Mg is investigated by using Beckman Flame Spectrophotometer Model DU. The maximum limit of estimation of CaO and MgO by this method is 500 p. p. m. and 1000 p. p. m., respectively, when Ca is estimated with the emission line of 554mμ and with the width of slit 0.15 mm., while Mg is estimated with the emission line of 371mμ and with the width of slit 0.5mm. The operation is carried out by keeping the pressure of oxygen at 15 lbs./in2 and that of hydrogen at 3 lbs./in2. The emission of Ca is not interfered by the presence of Mg but that of Mg is interfered by Ca. As the degree of interference by Ca is proportional to the concentration of Ca, determination of Ca is previously made at 554 mμ and the corresponding emission of Ca at 371 mμ is substracted from the emission value of Mg at 371 mμ. Emissions of Ca and Mg are interfered remarkably by the presence of other elements and it is necessary to remove these elements. Since the clogging of capillary of the burner by salts caused irregularity in emission, Ca and Mg are precipitated as CaCO3 and Mg(OH)2, and the precipitates are dissolved in HCl. The result of flame photometry is excellent and it is found to be suitable for rapid analysis of Ca and Mg in rocks and bricks.
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