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Application of potentiometric stripping analysis with constant inverse current for determining soluble lead in human teeth |
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| Authors: | Biljana M. Kali?anin Ru?ica S. Nikoli? |
| Affiliation: | a Faculty of Technology, University of Niš, Bulevar oslobo?enja 124, 16000 Leskovac, Serbia and Montenegro, Yugoslavia b Department of Chemistry, Faculty of Sciences, University of Niš, Višegradska 33, 18000 Niš, Serbia and Montenegro, Yugoslavia c Faculty of Technology, University of Novi Sad, Bulevar Cora Lazara 1, 21000 Novi Sad, Serbia and Montenegro, Yugoslavia |
| Abstract: | A method for the determination of soluble lead in human teeth by potentiometric stripping analysis with constant inverse current in the analytic step (PSA-iR), is described. The metal ions were concentrated as their amalgams on the glassy carbon surface of a working electrode that was previously coated with a thin mercury film and then stripped by a suitable oxidant. This paper examined effect of various factors on the PSA-iR results including the electrolysis potential, the solution stirring rate, and the constant inverse current. Quantitative analysis was carried out by both standard addition and calibration curve methods; a good linearity was obtained in the concentration range from 5 to 25 μg/dm3. A detection limit of 0.64 μg/dm3 was obtained, with a 5.21% coefficient of variation. Results obtained for teeth were not significantly different from these obtained by flameless atomic absorption spectrophotometry (FAAS). |
| Keywords: | Potentiometric stripping analysis Constant inverse current Lead Teeth |
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