| Autor: |
Bozidar Ogorevc, Hanna Sopha, Ivan Švancara, Samo B. Hočevar, Eva Tesarova, Karel Vytras, Lucie Baldrianova |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
Electrochimica Acta. 55:7929-7933 |
| ISSN: |
0013-4686 |
| Popis: |
The simultaneous measurement of microgram per liter concentration levels of indium(III), thallium(I) and zinc(II) at the antimony film carbon paste electrode (SbF-CPE) is demonstrated. The antimony film was deposited in situ on a carbon paste substrate electrode and employed in chronopotentiometric stripping mode in deoxygenated solutions of 0.01 M hydrochloric acid (pH 2). The chronopotentiometric stripping performance of the SbF-CPE was studied and compared with constant current chronopotentiometric stripping and anodic stripping voltammetric operation. In comparison with its bismuth and mercury counterparts, the SbF-CPE exhibited advantageous electroanalytical performance; namely, at the bismuth film electrode, the measurement of zinc(II) was practically impossible due to hydrogen evolution, whereas the mercury film electrode exhibited a poorly developed signal for thallium(I). The SbF-CPE revealed favorable calculated LoDs (3 σ ) of 1.4 μg L −1 for thallium(I) and 2.4 μg L −1 for indium(III) along with good linear response in the examined concentration range from 10 to 100 μg L −1 with correlations coefficients ( R 2 ) of 0.992 for thallium(I) and 0.994 for indium(III) associated with a 120 s deposition time. The chronopotentiometric stripping performance of the SbF-CPE was characterized also by satisfactory reproducibility of 1.62% for indium(III), 3.96% for thallium(I) and 2.11% for zinc(II) ( c = 40 μg L −1 , n = 11). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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