Sodium dithionite is proposed as a new demasking agent for the rapid and selective complexometric determination of thallium(III). In the presence of diverse metal ions, thallium (III) was first complexed with excess EDTA and the surplus EDTA was then titrated with a standard zinc sulphate solution at pH 5-6 (hexamine buffer) using Xylenol Orange as the indicator. The EDTA equivalent to thallium was then released selectively with sodium dithionite and back titrated with a standard zinc sulphate solution as before. Reproducible and accurate results were obtained in the range 4 - 100 mg of thallium with a relative error of ±27 % and a coefficient of variation (n = 6) of not more than 0.30 %. The effects of various diverse ions were studied. The method was applied to the determination of thallium in its complexes and in alloys.

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dc.contributor.authorShetty, P.
dc.contributor.authorNityananda Shetty, A.N.
dc.date.accessioned2026-02-05T11:00:18Z
dc.date.issuedSodium dithionite as a selective demasking agent for the complexometric determination of thallium
dc.description.abstract2005
dc.identifier.citationJournal of the Serbian Chemical Society, 2005, 70, 11, pp. 1357-1362
dc.identifier.issn3525139
dc.identifier.urihttps://doi.org/10.2298/JSC0511357S
dc.identifier.urihttps://idr.nitk.ac.in/handle/123456789/27931
dc.publisherSerbian Chemical Society
dc.subjectComplexometry
dc.subjectDemasking agent
dc.subjectEDTA method
dc.subjectSodium dithionite, thallium
dc.titleSodium dithionite is proposed as a new demasking agent for the rapid and selective complexometric determination of thallium(III). In the presence of diverse metal ions, thallium (III) was first complexed with excess EDTA and the surplus EDTA was then titrated with a standard zinc sulphate solution at pH 5-6 (hexamine buffer) using Xylenol Orange as the indicator. The EDTA equivalent to thallium was then released selectively with sodium dithionite and back titrated with a standard zinc sulphate solution as before. Reproducible and accurate results were obtained in the range 4 - 100 mg of thallium with a relative error of ±27 % and a coefficient of variation (n = 6) of not more than 0.30 %. The effects of various diverse ions were studied. The method was applied to the determination of thallium in its complexes and in alloys.

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