Dasgupta, S and Sinha, Birendra Chandra (1980) Stepwise complexometric determination of calcium and magnesium, and manganese in blast furnace slags and manganese minerals. Transactions of the Indian Ceramic Society, 39 (3). pp. 94-97. ISSN 0371-750X

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A simple and rapid complexometric method for stepwise titration of Ca and Mg, and Mn in blast furnace slags and manganese minerals has been worked out without involving any separation of manganese. The method is based on the joint titration of Ca and Mg at pH 10 using naptholgreenorthocresolphthalein-ammonium chloride mixed indicator after masking manganese effectively with KCN and bubbling air through the solution (30° -40°C) for 10 minutes. Manganese is then titrated at the same pH in the presence of indicator solution containing eriochrome black T, titan yellow and triethanol amine after reducing the Mn (III) hexacyano complex to Mn (II) cyanide complex with ascorbic acid. Calcium is, however, determined from a separate aliquot by direct titration with EDTA using calcein-thymolphthalein indicator after masking Mn with TEA and K CN. © 1980 Taylor & Francis Group, LLC.

Item Type: Article
Subjects: Microstructure and Characterization
Depositing User: Bidhan Chaudhuri
Date Deposited: 25 May 2016 11:27
Last Modified: 25 May 2016 11:27
URI: http://cgcri.csircentral.net/id/eprint/3410

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