Banerjee, N L and Sinha, Birendra Chandra (1980) A critical study on the flame photometric determination of calcium in ceramic materials. Transactions of the Indian Ceramic Society, 39 (5). pp. 165-171. ISSN 0371-750X

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The interfering effects due to various ceramic constituents such as aluminium, titanium, zirconium and alkalies on the radiation signal of calcium have been critically studied in both hydrochloric and sulphuric acid media using a Oamephotometer with light filter and low flame temperature such as town gas, air or LPG air-flame. It has been observed that in hydrochloric acid medium Al, Ti and Zr have quenching effect on the radiation signal of calcium even at low concentrations while in sulphuric acid medium it has hardly any effect when Al: Ca and Ti: Ca ratios are less than 1/5 and Zr: Ca ratio is less than one. It has also been observed that the radiation signal of calcium is almost completely quenched when the Al: Ca, Ti: Ca and Zr: Ca ratios are � 5, � 4 (� 8 in HCl) and � 20 respectively in HCl and H2SO4media due to the formation of CaO, Al2O3; CaO, TiO2and CaO, ZrO2spinels. Magnesium in concentration of 200 or more times of calcium can quantitatively release calcium from Al, Ti and Zr in the range present in alumino silicates only in H2SO4medium due to the preferential formation of MgO, Al2O3spinel. Based on these observations, a simple flame-photometric method has been worked out in which calcium radiation signal is first completely quenched and subsequently released by the addition of adequate amount of magnesium. The method is accurate, sensitive and utilized for determination of smaU amount of calcium in various ceramic materials. © 1980 Taylor & Francis Group, LLC.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 25 May 2016 07:23
Last Modified: 25 May 2016 07:23

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