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National Repository of Grey Literature

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	The use of composite graphite electrode for voltammetric determination of phenylglyoxylic acid Šenholdová, Z. ; Navrátil, Tomáš ; Shanmugam, K. ; Barek, J. ; Žák, J. A composite electrode prepared from graphite powder and epoxy resin was applied as a working electrode for the determination of phenylglyoxylic acid (one of the metabolites of styrene) in human urine. Cathodic differential pulse stripping voltammetry was used and optimum conditions have been found giving the limit of determination about 5 mg L-1. All results were compared with those obtained using hanging mercury drop electrode. For the confirmation of suggested mechanism of the electrochemical reaction the elimination voltammetry with linear scan was used. Detailed record
	Voltammetric determination of genotoxic compounds using solid amalgam electrodes Barek, J. ; Čížek, K. ; Fischer, J. ; Navrátil, Tomáš ; Josypčuk, Bohdan Possibilities of voltammetric determinations of genotoxic organic compounds for environmental purposes were studied. Traditional mercury electrode was replaced by solid amalgam electrodes. It is possible to conclude that the obtained results are comparable with those, obtained on other types of electrodes. Detailed record
	The Use of Amalgam Electrodes in Electrochemical Analysis of Azidothimidine in Remedy Form Pecková, K. ; Moreira, J. C. ; Josypčuk, Bohdan ; Navrátil, Tomáš ; Zima, J. ; Barek, J. Azidothymidine (3´-azido-3´-deoxythimidine, AZT, Zidovudin) is a nucleoside analog, derived from thimidine. This compound prohibids the replicatrion of HIV virus. The article deals with its voltammetric determination using mercury and silver solid amalgam electrode. The results are compared with those obtained using HPLC. Detailed record
	Voltammetric Determination Phenylglyoxylic Acid in Urine Using Graphite Composite Electrode Navrátil, Tomáš ; Šenholdová, Z. ; Shanmugam, K. ; Barek, J. ; Surovcová, H. Phenylglyoxylic acid is metabolized in human body from vinylbenzene (styrene) (from which polystyrene is produced). Presented work deals with determination of this metabolite in human urine using carbon composite electrode. In the article are compared the results of analysis of the certified material (urine), achieved on the mercury and on the carbon composite electrodes. Detailed record
	Ink Films from Carbon Powders on Conventional Solid Electrodes as Alternative Disposable Sensors Josypčuk, Bohdan ; Barek, J. ; Novotný, Ladislav Rozšíření rozsahu pracovních potenciálů pevných elektrod bylo docíleno jejich pokrytím filmem z polymeru obsahujícího vodivé částice (grafitu, skelného uhlíku, nanotub aj.). Takový film může obsahovat 70 - 90% skelného uhlíku a 30 - 10% polystyrenu (procenta hmotnostní). Film se 70 % skelného uhlíku se chová více jako soubor mikroelektrod; s 90 % - spíše jako klasická elektroda ze skelného uhlíku. S takovým filmem lze pracovat i celý den; pro odstranění filmu stačí otřít ho o filtrační papír. Pro oxidaci ferocenu, adeninu, guaninu a jiných látek byly použity filmy s různým obsahem skelného uhlíku na podložkách ze stříbrného pevného amalgamu, zlata a platiny. Detailed record

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