Dasgupta, S and Sinha, Birendra Chandra and Rawat, N S (1982) Stepwise complexometric determinations of calcium and magnesium in lime and magnesia bearing materials. Transactions of the Indian Ceramic Society, 41 (1). pp. 14-16. ISSN 0371-750X

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Abstract

A simple and rapid complexometric method for stepwise titration of calcium and magnesium, when present in unfavourable ratios, has been successfully worked out. The method is based on the direct titration of calcium of pH 12 with EDTA, using thymolphthaleincalcein indicator. The adsorption of metallochromic indicator and any Ca2+has been prevented by the prior addition of titan yellow which masks magnesium by lake formation. Glycerine is also added as a protective colloid to stabilize the lake and to prevent coprecipitation of Ca(OH)2After dissolution of the lake in HCl acid, subsequent addition of ascorbic acid, then ammonia and ammonia buffer, for controlling the pH at 10, Mg is determined in the same aliquot by direct titration with EDTA using Eriochrome Black T indicator. The method has been successfully applied for the determination of calcium oxide and magnesium oxide in magnesite, dolomite, asbestos and other lime and magnesia bearing materials. © 1982 Taylor & Francis Group, LLC.

Item Type:	Article
Subjects:	Microstructure and Characterization
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	24 May 2016 10:25
Last Modified:	24 May 2016 10:25
URI:	http://cgcri.csircentral.net/id/eprint/3390

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