A miniaturized electrode system for voltammetric determination of electrochemically reducible environmental pollutants
| Autor: | Vlastimil Vyskočil, Jiří Barek, Andrea Hájková, Bohdan Josypčuk |
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| Rok vydání: | 2016 |
| Předmět: |
Working electrode
Reducing agent Calibration curve Supporting electrolyte 010401 analytical chemistry Inorganic chemistry Metals and Alloys Analytical chemistry chemistry.chemical_element 010402 general chemistry Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Mercury (element) chemistry.chemical_compound chemistry Electrode Materials Chemistry Differential pulse voltammetry Electrical and Electronic Engineering Instrumentation Sodium sulfite |
| Zdroj: | Sensors and Actuators B: Chemical. 227:263-270 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2015.11.136 |
| Popis: | A newly designed miniaturized electrode system (MES) based on a mercury meniscus modified silver solid amalgam electrode as the working electrode was developed for voltammetric determination of electrochemically reducible organic compounds in small sample volumes. Genotoxic 2-aminofluoren-9-one (2-AFN) was chosen as a model environmental pollutant in this study to test the performance of the introduced MES. The determination of 2-AFN was carried out by differential pulse voltammetry in 100 μL samples under following conditions, using two different ways of air oxygen removal: (i) a supporting electrolyte methanol–Britton–Robinson (BR) buffer of pH 4.0 (1:9, v/v), with regeneration potentials Ereg,1 = 0 mV and Ereg,2 = −1200 mV and with oxygen removal by bubbling with nitrogen, and (ii) a supporting electrolyte methanol–BR buffer of pH 10.0 (1:9, v/v), with regeneration potentials Ereg,1 = −200 mV and Ereg,2 = −1600 mV and with oxygen removal by the addition of solid sodium sulfite as a reducing agent. The calibration curves were measured in the concentration range from 1 to 100 μmol L−1 of 2-AFN, with the limits of quantification about 1 μmol L−1 reached in both media. The practical applicability of the newly developed voltammetric methods using the MES was successfully verified on the direct determination of 2-AFN in model samples of drinking and river water. |
| Databáze: | OpenAIRE |
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