Abstract

Pb +2 (~37-0.6mg) and Tl + (45-0.9 mg) can bc estimated by mixing with KmnO 4 in presence of Ba +2 ions and I NNaOH. The excess KmnO 4 is then titrated with formic acid. A mixture of Pb +2 and Tl + is oxidized simultaneously with KMn0 4 in 0.1 N NaOH. Pb +2 interferes also when precipitated as sulphate or tellurate. In presence of SO 4 -2 and telluric acid, thallium can be titrated only when its concentration is not less than 30 mg, below which lead seriously interferes. Tl + can be accurately determined in the filtrate from the PbS0 4 precipitate.

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