A simple and selective EDTA method using a masking and demasking technique is proposed for the determination of thallium(III). The thallium is complexed with excess of EDTA, the surplus being back-titrated (pH 5-6, hexamine buffer) with zinc sulphate solution (Xylenol Orange as indicator). 4-Amino-5-mercapto-3-propyl-1,2,4-triazole is then added and the mixture heated on a water-bath for 5-10 min to displace EDTA from its thallium complex. The EDTA liberated is titrated with zinc sulphate solution. Reproducible and accurate results are obtained in the range 5-75 mg of thallium with both the relative error and coefficient of variation not exceeding 0.4%. © 1987.
| dc.contributor.author | Shetty A, N. | |
| dc.contributor.author | Gadag, R.V. | |
| dc.contributor.author | Gajendragad, M.R. | |
| dc.date.accessioned | 2026-02-05T11:00:43Z | |
| dc.date.issued | Complexometric titration of thallium(III), by use of 4-amino-5-mercapto-3-propyl-1,2,4-triazole as replacing reagent | |
| dc.description.abstract | 1988 | |
| dc.identifier.citation | Talanta, 1988, 35, 9, pp. 721-722 | |
| dc.identifier.issn | 399140 | |
| dc.identifier.uri | https://doi.org/10.1016/0039-9140(88)80168-1 | |
| dc.identifier.uri | https://idr.nitk.ac.in/handle/123456789/28110 | |
| dc.title | A simple and selective EDTA method using a masking and demasking technique is proposed for the determination of thallium(III). The thallium is complexed with excess of EDTA, the surplus being back-titrated (pH 5-6, hexamine buffer) with zinc sulphate solution (Xylenol Orange as indicator). 4-Amino-5-mercapto-3-propyl-1,2,4-triazole is then added and the mixture heated on a water-bath for 5-10 min to displace EDTA from its thallium complex. The EDTA liberated is titrated with zinc sulphate solution. Reproducible and accurate results are obtained in the range 5-75 mg of thallium with both the relative error and coefficient of variation not exceeding 0.4%. © 1987. |