Transactions of the INDIAN CERAMIC SOCIETY Vol. 44 1985
Stepwise Complexometric Determination of Titanium and
Aluminium in Bauxite after Selective Precipitation
of Ti-quinolin-8-olate and its Extraction
with Chloroform
S. K. RoY, B. C. SINHA AND N. S. RAWAT*
Pages : 6-9
DOI :10.1080/0371750X.1985.10822719
Abstract
A method has been developed for stepwise complexometric determination
of titanium and aluminium in the same solution and pH
using xylenol orange as indicator. The method is based on complexation
of AI and Ti by boiling with excess EDTA at pH,...., 5.3 and then
precipitation of titanium selectively from EDT A complexes of AI and
Ti with excess of quinolin-8-ol from a homogeneous solution at
60°-70°C. The released EDTA, equivalent to titanium, is titrated
first with lead nitrate solution using xylenol orange as indicator after
extraction of Ti-quinolin-8-olate with chloroform and then in the
same solution EDTA is released from Al-EDTA complex on boiling
with fluoride ions and the released EDTA is back titrated with lead to
establish aluminium. The method has been applied to the determination
of titanium and aluminium in materials like bauxite and other
high titania bearing materials. The interference of iron has been eliminated
by extracting with MmK at 6-7 M HCI.
