Kaya, Nijhuma and Singh, Nahar
(2008)
Selective masking and demasking for the stepwise omplexometric
determination of aluminium, lead and zinc from the same solution.
Chemistry Central Journal , 2 (4).
pp. 1-5.
ISSN 1752-153X
Abstract
A complexometric method based on sele
ctive masking and de-masking has been
developed for the rapid determinatio
n of aluminium, lead and zinc from the same solution in glass
and glass frit samples. The determination is carr
ied out using potassium cya
nide to mask zinc, and
excess disodium salt of EDTA to mask lead an
d aluminium. The excess EDTA was titrated with
standard Mn(II)SO
4
solution using Erichrome Black-T as the
indicator. Subseque
ntly selective de-
masking agents – triethanolamine, 2,3-dimercapto
propanol and a formaldehyde/acetone mixture –
were used to determine quantities
of aluminium, lead and zinc in
a stepwise and selective manner
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