Digitální knihovnaUPCE
 

8/2013-14 Sensing in Electroanalysis

Permanentní URI k tomuto záznamuhttps://hdl.handle.net/10195/56677

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20145

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Autor: search.filters.author.Barek, Jiří

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Nyní se zobrazuje 1 - 5 z 5
  • Náhled
    Článekpeer-reviewedpublishedOtevřený přístup
    New applications of carbon paste electrodes for determination of biologically active organic compoun
    (Univerzita Pardubice, 2014) Zima, Jiří; Barek, Jiří; Dejmková, Hana; Wang, Joseph
    In this paper, new electrochemical determinations of selected biologically active compounds are described employing various types of carbon paste electrodes (CPE) in batch voltammetric methods (differential pulse voltammetry (DPV), direct current voltammetry (DCV), and cyclic voltammetry (CV)) and in HPLC with electrochemical detection (HPLC-ED) utilizing amperometric CPE sensors. The results for determination of cymoxanil, famoxadone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, chlortoluron, carboxin, triclosan, diafenthiuron, and propyl gallate are compared and discussed. Glassy carbon spherical microparticles were used as carbonaceous component of the paste. The limits of detection of some analytes were below 1·10-7 mol l-1 in both batch and flow methods. The newly developed methods of determination were applied to model samples of drinking and river water, soils, and practical samples of edible oil, toothpaste, soap, and toilet water.
  • Náhled
    Článekpeer-reviewedpublishedOtevřený přístup
    Non-traditional electrode materials for detection of biomarkers
    (Univerzita Pardubice, 2014) Barek, Jiří; Moreira, Josino C.; Wang, Joseph
    In this paper, new electrochemical methods suitable for detection of various types of biomarkers (biomarkers of exposition, tumor biomarkers, and biomarkers of medical treatment) are briefly reviewed. Attention is paid to the use of non-traditional electrode materials (various forms of amalgam electrodes, boron doped diamond film electrodes, carbon paste and carbon film electrodes, etc.) for voltammetric (batch analysis) and amperometric (flowing systems) detection of above mentioned biomarkers.
  • Náhled
    Článekpeer-reviewedpublishedOtevřený přístup
    Voltammetric and amperometric determination of biologically active organic compounds using various types of silver amalgam electrodes
    (Univerzita Pardubice, 2014) Barek, Jiří; Fischer, Jan; Moreira, Josino C.; Wang, Joseph
    In this paper, possibilities of various types of silver amalgam electrodes for determination of micromolar and submicromolar concentrations of various electrochemically reducible biologically active organic compounds are reviewed. Attention is paid to the use of polished and mercury meniscus modified silver solid amalgam electrodes, silver amalgam paste electrodes both with and without pasting liquids, single crystal silver amalgam electrodes, composite silver amalgam electrodes, and porous silver amalgam electrodes. Main focus is on voltammetric application of above mentioned electrodes. However, their application in flowing systems (high performance liquid chromatography and flow injection analysis with electrochemical detection) is briefly discussed as well. The compatibility of various types of silver amalgam electrodes with preliminary separation based on solid phase extraction is demonstrated on determination of nanomolar concentrations of environmentally important compounds in model samples of drinking and river waters.
  • Náhled
    Článekpeer-reviewedpublishedOtevřený přístup
    Boron doped diamond electrodes in voltammetry: new designs and applications (an overview)
    (Univerzita Pardubice, 2014) Zavázalová, Jaroslava; Barek, Jiří; Pecková, Karolina
    In this overview, the recent progress in the development and applications of bare boron doped diamond electrodes in voltammetry of organic compounds is summarized. Attention is paid to important issues reflected in last five years in electroanalytical studies, e.g. fouling and pretreatment of BDD surface, influence of boron concentration on performance of BDD-based sensors, and application of adsorptive stripping voltammetry.
  • Náhled
    Článekpeer-reviewedpublishedOtevřený přístup
    Electrodes modified with bismuth, antimony and tin precursor compounds for electrochemical stripping analysis of trace metals (a short review)
    (Univerzita Pardubice, 2014) Lezi, Nikolitsa; Economou, Anastasios; Barek, Jiří
    Over the last decade, intensive research is being carried out towards the development of “green” electrochemical sensors. Bismuth, antimony and tin electrodes have been proposed as potential substitutes of mercury electrodes in electrochemical stripping analysis of trace metals. The main advantage of these metals as electrode materials is their lower toxicity compared to mercury. Among the different configuration of bismuth, antimony and tin electrodes, one of the most attractive involves the modification of a support material with a bismuth, antimony or tin precursor compound (oxide, hydroxide or sparingly soluble salt). When the electrode is polarized to a sufficiently cathodic potential, the metal precursor is reduced to the respective metal which forms a thin “film” on the surface of the support material. The present article is an overview of the existing state–of–the–art in the field of bismuth, antimony and tin precursor–modified sensors. This review covers and critically discusses the various fabrication approaches (support materials, types of precursor compounds, modification approaches, precursor reduction methods) and also lists typical applications of these precursor–modified sensors to electrochemical stripping analysis of metals.