http://hdl.handle.net/10195/38130 2013-05-25T07:49:19Z 2013-05-25T07:49:19Z Zavázalová, Jaroslava Dejmková, Hana Ramešová, Šárka Barek, Jiří Pecková, Karolina http://hdl.handle.net/10195/38259 2013-01-21T01:03:55Z 2010-01-01T00:00:00Z

Title: Amperometric and spectrophotometric detection of aminobiphenyls and aminonaphthalenes in HPLC Authors: Zavázalová, Jaroslava; Dejmková, Hana; Ramešová, Šárka; Barek, Jiří; Pecková, Karolina Abstract: A new method for the determination of selected aminobiphenyls (ABs) and aminonaphthalenes (ANs), proved or suspected carcinogens and mutagens, was developed using reversed-phase HPLC coupled to an amperometric platinum tubular detector and a spectrophotometric detector. Using mobile phase consisting of acetonitrile and phosphate buffer pH 2.5 (40:60, v/v), separation of 2- and 4-aminobiphenyl and 1- and 2-aminonaphthalene was achieved within 10 min and limits of determination between 3·10–8 mol L–1 and 8·10–8 mol L–1 were obtained for amperometric detection. In comparison with spectrophotometric detection, it is superior in both sensitivity and selectivity. The developed method was applied on the analysis of spiked samples of urine. Solid phase extraction was used for a preliminary separation and preconcentration of the tested analytes, leading to the decrease of limits of determination to the values between 7.2·10–9 mol L–1 and 2.7·10–8 mol L–1.

2010-01-01T00:00:00Z Weidlich, Tomáš Stočes, Matěj Švancara, Ivan http://hdl.handle.net/10195/38258 2012-02-12T06:00:17Z 2010-01-01T00:00:00Z

Title: Possibilities and limitations of ionic liquids in electrochemical and electroanalytical measurements (a review) Authors: Weidlich, Tomáš; Stočes, Matěj; Švancara, Ivan Abstract: A review (with 155 refs.) concerning the current achievements and typical trends in the chemistry of (room temperature) ionic liquids, (RT)ILs, with particular emphasis on their applicability in electrochemical and electroanalytical measurements. The latter is documented on a rapid progress of ionic liquid-modified carbon paste electrodes (IL-CPEs), the so-called carbon ionic liquid electrodes (CILEs), and related configurations in the last half-decade, within the period of 2005-2010.

2010-01-01T00:00:00Z Vyskočil, Vlastimil Daňhel, Aleš Fischer, Jan Novotný, Vít Deýlová, Dana Horáková, Eva Barek, Jiří Yosypchuk, Bogdan Wang, Joseph http://hdl.handle.net/10195/38257 2012-09-11T00:16:59Z 2010-01-01T00:00:00Z

Title: Silver amalgam electrodes – a look back at the last five years of their development and applications Authors: Vyskočil, Vlastimil; Daňhel, Aleš; Fischer, Jan; Novotný, Vít; Deýlová, Dana; Horáková, Eva; Barek, Jiří; Yosypchuk, Bogdan; Wang, Joseph Abstract: Different types of silver amalgam electrodes have been introduced as modern and promising replacements for traditional mercury electrodes. Advantages and possibilities of these novel electrode materials were highlighted and demonstrated at a number of sensitive voltammetric and amperometric (HPLC, flow injection analysis) methods developed in our UNESCO Laboratory of Environmental Electrochemistry in the last five years. The determined analytes were hazardous organic chemical carcinogens and genotoxic environmental pollutants, pesticides, antitumor, antibiotic and antivirotic drugs, and explosives containing electrochemically reducible nitro, nitroso, azido, and oxo groups.

2010-01-01T00:00:00Z Urbanová, Veronika Bartoš, Martin Borecká, Daniela Vytřas, Karel http://hdl.handle.net/10195/38256 2012-09-11T00:02:09Z 2010-01-01T00:00:00Z

Title: Wood-free resin pencil as low-cost electrode for pH measurements Authors: Urbanová, Veronika; Bartoš, Martin; Borecká, Daniela; Vytřas, Karel Abstract: We report on possible use of wood-free resin pencil (WPE) as low-cost pH electrode based on WPE coated by antimony or bismuth film as the main pH sensitive material. Sensors prepared allowed to measure pH in the range of 3-10 and 10-13. The pH electrodes proposed can take advantage in strong alkaline and corrosive systems where the use of traditional glass electrode is limited. Also, they can serve as the low-cost indicator electrodes in acid-base titrations.

2010-01-01T00:00:00Z