Transactions of the INDIAN CERAMIC SOCIETY Vol. 51 1992
Spectrophotometric Determination of Lead with Dithizone after
Selective Separation on Polyurethane Foam Sorbents
NIBBDITA.CHAKRABARTI AND S. K. Roy
Pages : 73-75
DOI : 10.1080/0371750X.1992.10804540
Abstract
A spectrophotometric method has been developed for detennlnation
or small amounts of lead In glass and some ceramic raw
materials. The method Involves selective separation of lead with
S.SS.x 10-5M dithizoneand7.5 x to-2M KCN at pH ... tO followed
by elution or the complex with acetone and making It alkaline
with 0.2 ml or 2.5M NH3 1n a total volume or 10 ml. The method
obeys Beers law from 0.1 to 2.5 J.tg Pb.ml-1 at 500 nm. Correlation
coeftlclent calculated from the linearity curve Is 0.99. Interferences
due~ Cu(ll), Co(m, Ni (ll), Zn(ll), Cd(ll), Mn(lll) and
Fe (II) have been eliminated automatically by using KCN. Effect
of Fe(lll) could be eliminated by extraction with MIBK prior to
the separation of lead. The developed method has been standardIzed
against National Bureau of Standards opal glass sample
(NBS 91). Standard deviation of the results has been round to be
±0.0021.
