目視滴定法による有機化合物中のカルシウムおよびマグネシウムの同時微量定量

概要

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An accurate visual titration method for simultaneous microdetermination of calcium and magnesium has been introduced by using complexometry with GEDTA and CyDTA using MTB and BNP as indicators.<BR>The investigation was carried out to obtain the optimum condition for simultaneous microdetermination of calcium and magnesium. As the result, a procedure was established in which calcium, in the first place, was determined by a back titration of excess standard GEDTA with standard calcium solution at pH 13 using BNP as an indicator in an aqueous acetone medium. Magnesium was successively determined by titration with standard CyDTA solution at pH 1011 using MTB as an indicator.<BR>The method has been successfully applied to the flask combustion method for calcium and magnesium in organic compounds with sufficient accuracy, the standard deviation being less than 0.2%.
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