Transactions of the INDIAN CERAMIC SOCIETY Vol. 44 1985
A Rapid Complexometric Method for the Determination
of ZnO, Alz03 and PzOs in Phosphate-Based Glasses
DIPALI KuNou, S. K. Rov AND S. DASGUPTA
Pages : 106-108
DOI : 10.1080/0371750X.1985.10822754
Abstract
A rapid complexometric method has been developed for determination
of ZnO, Al203 and P20s in zinc-phosphate glasses. Aluminium
and zinc are determined in one aliquot, and P20 5 in another, from
the same stock solution. The method is based on the complexation
of both the metals with a known amount of EDTA. EDTA is then
selectively relea11ed from AI-EDTA complex by NaF and titrated.
The unreleased EDT A establishes zinc. The determination of phosphorus
involves precipitation of phosphate with a known excess of
lanthanum solution at 60 -70°C and back titration of the excess
with EDTA at pH 5.3, zinc and aluminium being premasked with
EDT A. Results obtained with synthetic solutions as well as glass
samples following the method are quite agreeable to those obtained
by the standard methods.
