A simple and selective complexometric method for the determination of thallium(III) is proposed by using thioglycolic acid as a masking agent. In the presence of diverse metal ions thallium(III) is complexed with excess EDTA and the surplus EDTA is back titrated (pH 5 - 6 , hexamine) with standard zinc sulphate solution using xylenol orange indicator. A freshly prepared 1% aqueous solution of thioglycolic acid is then added to displace EDTA from Tl(III)-EDTA complex and the released EDTA is titrated with standard zinc sulphate solution. The results for the determination of 4 - 87 mg of thallium are obtained with a relative error of 0.3% and coefficient of variation 0.46%. The effect of diverse ions are studied. The method is applied to the determination of thallium in its complexes and synthetic mixtures.
| dc.contributor.author | Shetty, P. | |
| dc.contributor.author | Nityananda Shetty, A.N. | |
| dc.contributor.author | Gadag, R.V. | |
| dc.date.accessioned | 2026-02-05T11:00:31Z | |
| dc.date.issued | Indirect complexometric determination of thallium(III) using thioglycolic acid as masking agent | |
| dc.description.abstract | 2000 | |
| dc.identifier.citation | Indian Journal of Chemical Technology, 2000, 7, 5, pp. 227-229 | |
| dc.identifier.issn | 0971457X | |
| dc.identifier.uri | https://idr.nitk.ac.in/handle/123456789/28022 | |
| dc.title | A simple and selective complexometric method for the determination of thallium(III) is proposed by using thioglycolic acid as a masking agent. In the presence of diverse metal ions thallium(III) is complexed with excess EDTA and the surplus EDTA is back titrated (pH 5 - 6 , hexamine) with standard zinc sulphate solution using xylenol orange indicator. A freshly prepared 1% aqueous solution of thioglycolic acid is then added to displace EDTA from Tl(III)-EDTA complex and the released EDTA is titrated with standard zinc sulphate solution. The results for the determination of 4 - 87 mg of thallium are obtained with a relative error of 0.3% and coefficient of variation 0.46%. The effect of diverse ions are studied. The method is applied to the determination of thallium in its complexes and synthetic mixtures. |