A miniaturized electrode system for voltammetric determination of electrochemically reducible environmental pollutants

0453603 - ÚFCH JH 2017 RIV CH eng J - Journal Article
Hájková, A. - Vyskočil, V. - Josypčuk, Bohdan - Barek, J.
A miniaturized electrode system for voltammetric determination of electrochemically reducible environmental pollutants.
Sensors and Actuators B - Chemical. Roč. 227, MAY 2016 (2016), s. 263-270. E-ISSN 0925-4005
R&D Projects: GA ČR GBP206/12/G151; GA ČR GAP206/11/1638
Institutional support: RVO:61388955
Keywords : Miniaturized electrode system * Silver solid amalgam electrode * 2-Aminofluoren-9-one
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 5.401, year: 2016

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.

Permanent Link: http://hdl.handle.net/11104/0254371