| Rapid Complexometric Method for Determination
of Lead and Barium in Silicates |
S. K. RoY AND B. C. SINHA
Pages : 141-144
DOI : 10.1080/0371750X.1977.10840654 |
| Abstract |
| A complexometric method has been worked out for rapid
determination of lead and barium in silicate materials.
Lead and barium are separated as sulphates from other
constituents by decomposing the sample with hydrofluoric
and sulphuric acids. Lead sulphate is then separated from
barium sulphate by selective dissolution of the former in
excess EDTA at pH 4.3 and then determined by back
titrating the unconsumed EDTA with ferric sulphate
using sulphosalicylic acid as indicator. Lead is calculated
out from the equivalent EDTA consumed. Barium is then
determined by dissolving the residue in ammoniacal excess
EDTA solution and back titrating the nnconsumed
EDTA with magnesium chloride at pH 10 and at 10°C
using mixed indicator solution. The method is free
from interferences due to other RO group elements except
strontium, for which an alternative procedure has also been
worked out. |
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