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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 46  1987
Direct Complexometric Determination of Aluminium in Presence of High Iron and High Titanium
M. R. SAHA, S. N. DAs* AND S. DASGUPTA
Pages : 162-165
DOI : 10.1080/0371750X.1987.10822863
Abstract
Usually, complexometric determination of aluminium in solution involves a back titration procedure using zinc acetate and EDTA at pH 5.3. Iron and titanium, when present in large amounts, interfere due to intense yellow colour of Fe(III)-EDTA complex and slow hydrolysis of TiO-EDTA complex. A method has been developed where alumina has been directly determined via indirect titration with EDT A overcoming the interfering effects of iron and titanium. An excess of EDTA is added, the solution is brought to pH 5-6 and boiled. NaOH solution is then added to bring the pH of the alkaline solution to 11-11.5, when iron and titanium complexes break down, producing the respective hydroxides. The solution is then made to a definite volume along with the hydroxide precipitates. An aliquot of the filtered solution is analysed for alumina following the usual back titration procedure with EDTA. Synthetic solutions of alumina containing large amounts of iron and titanium, as well as iron and titanium bearing materials were analysed for alumina. The results obtained showed excellent precision and accuracy compared to those by other standard methods.
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