Potentiometric Stripping Analysis of Cadmium and Lead with Constant Inverse Current in the Analytical Step Using an Open Tubular Mercury-Coated Glassy Carbon Electrode
The most important experimental parameters of the flow potentiometric stripping analysis (PSA) with oxygen as an oxidant were investigated and optimised. A simple, homemade flow system consisting of glassy carbon tubes, which served as a working and auxiliary electrode, was used. By applying a rest...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Journal of Analytical Methods in Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2019/3579176 |
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| author | Zvonimir J. Suturović Snežana Ž. Kravić Zorica S. Stojanović Ana D. Đurović Tanja Ž. Brezo-Borjan |
| author_facet | Zvonimir J. Suturović Snežana Ž. Kravić Zorica S. Stojanović Ana D. Đurović Tanja Ž. Brezo-Borjan |
| author_sort | Zvonimir J. Suturović |
| collection | DOAJ |
| description | The most important experimental parameters of the flow potentiometric stripping analysis (PSA) with oxygen as an oxidant were investigated and optimised. A simple, homemade flow system consisting of glassy carbon tubes, which served as a working and auxiliary electrode, was used. By applying a rest period before the stripping step (the flow stop mode) and by imposing a constant reductive current simultaneously with the interruption of potentiostatic control, significant increase of the flow PSA sensitivity was achieved. In the determination of cadmium and lead, quantitation limits of 0.11 and 0.82 μg/L were obtained. The precision of the method was evaluated in terms of repeatability and reproducibility, with values of relative standard deviation lower than 4.0% for cadmium and 4.2% for lead. This modified technique was applied for simultaneous determination of cadmium and lead in milk, after a simple pretreatment of the samples by dilution and acidification. The method accuracy was confirmed by analysing the certified reference material of skimmed milk powder (ERM-BD151). |
| format | Article |
| id | doaj-art-7df15dd05bc54181af2ba2aa9b029ce4 |
| institution | Kabale University |
| issn | 2090-8865 2090-8873 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Analytical Methods in Chemistry |
| spelling | doaj-art-7df15dd05bc54181af2ba2aa9b029ce42025-08-20T03:35:24ZengWileyJournal of Analytical Methods in Chemistry2090-88652090-88732019-01-01201910.1155/2019/35791763579176Potentiometric Stripping Analysis of Cadmium and Lead with Constant Inverse Current in the Analytical Step Using an Open Tubular Mercury-Coated Glassy Carbon ElectrodeZvonimir J. Suturović0Snežana Ž. Kravić1Zorica S. Stojanović2Ana D. Đurović3Tanja Ž. Brezo-Borjan4Department of Applied and Engineering Chemistry, Faculty of Technology Novi Sad, University of Novi Sad, Novi Sad 21000, SerbiaDepartment of Applied and Engineering Chemistry, Faculty of Technology Novi Sad, University of Novi Sad, Novi Sad 21000, SerbiaDepartment of Applied and Engineering Chemistry, Faculty of Technology Novi Sad, University of Novi Sad, Novi Sad 21000, SerbiaDepartment of Applied and Engineering Chemistry, Faculty of Technology Novi Sad, University of Novi Sad, Novi Sad 21000, SerbiaDepartment of Applied and Engineering Chemistry, Faculty of Technology Novi Sad, University of Novi Sad, Novi Sad 21000, SerbiaThe most important experimental parameters of the flow potentiometric stripping analysis (PSA) with oxygen as an oxidant were investigated and optimised. A simple, homemade flow system consisting of glassy carbon tubes, which served as a working and auxiliary electrode, was used. By applying a rest period before the stripping step (the flow stop mode) and by imposing a constant reductive current simultaneously with the interruption of potentiostatic control, significant increase of the flow PSA sensitivity was achieved. In the determination of cadmium and lead, quantitation limits of 0.11 and 0.82 μg/L were obtained. The precision of the method was evaluated in terms of repeatability and reproducibility, with values of relative standard deviation lower than 4.0% for cadmium and 4.2% for lead. This modified technique was applied for simultaneous determination of cadmium and lead in milk, after a simple pretreatment of the samples by dilution and acidification. The method accuracy was confirmed by analysing the certified reference material of skimmed milk powder (ERM-BD151).http://dx.doi.org/10.1155/2019/3579176 |
| spellingShingle | Zvonimir J. Suturović Snežana Ž. Kravić Zorica S. Stojanović Ana D. Đurović Tanja Ž. Brezo-Borjan Potentiometric Stripping Analysis of Cadmium and Lead with Constant Inverse Current in the Analytical Step Using an Open Tubular Mercury-Coated Glassy Carbon Electrode Journal of Analytical Methods in Chemistry |
| title | Potentiometric Stripping Analysis of Cadmium and Lead with Constant Inverse Current in the Analytical Step Using an Open Tubular Mercury-Coated Glassy Carbon Electrode |
| title_full | Potentiometric Stripping Analysis of Cadmium and Lead with Constant Inverse Current in the Analytical Step Using an Open Tubular Mercury-Coated Glassy Carbon Electrode |
| title_fullStr | Potentiometric Stripping Analysis of Cadmium and Lead with Constant Inverse Current in the Analytical Step Using an Open Tubular Mercury-Coated Glassy Carbon Electrode |
| title_full_unstemmed | Potentiometric Stripping Analysis of Cadmium and Lead with Constant Inverse Current in the Analytical Step Using an Open Tubular Mercury-Coated Glassy Carbon Electrode |
| title_short | Potentiometric Stripping Analysis of Cadmium and Lead with Constant Inverse Current in the Analytical Step Using an Open Tubular Mercury-Coated Glassy Carbon Electrode |
| title_sort | potentiometric stripping analysis of cadmium and lead with constant inverse current in the analytical step using an open tubular mercury coated glassy carbon electrode |
| url | http://dx.doi.org/10.1155/2019/3579176 |
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