|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
|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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