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National Repository of Grey Literature 2 records found  Search took 0.06 seconds. 
Voltammetric Determination of 5-Nitroindazole Using Hanging Mercury Drop Electrode Different Electrode and Polished Silver Solid Amalgam Electrode
 Hrdlička, Vojtěch ; Navrátil, Tomáš (advisor) ; Zima, Jiří (referee)
The presented Bachelor Thesis deals with a study of electrochemical behavior of 5-nitroindazole (5-NI) with the search of optimal conditions for its determination using tech- niques of DC voltammetry (DCV) and differential pulse voltammetry (DPV) at hanging mer- cury drop electrode (HMDE) and polished silver solid amalgam electrode (p-AgSAE), and with the comparison of reached limits of quantification (LQ ). The optimal conditions found for determination of 5-NI in deionized water using DPV at HDME were as follows: Britton-Robinson (BR) buffer of pH 8.0 and inital potential of +100 mV. The calibration dependences were measured in the concentration range from 1·10-7 to 1·10-5 mol·dm-3 with the LQ of 1.8·10-7 mol·dm-3 . Moreover, the posibility of using adsorbtion stirring voltametry (AdSV) for determination of 5-NI in BR buffer of pH 8 was investigated. The method was ineffective due to rising base- line. The mechanism of electrochemical reduction and oxidation in BR buffer of pH 8 at HMDE was investigated. It was found that the reduction of 5-NI was controlled by diffusion and the following oxidation was controlled by adsorbtion. For determination of 5-NI in deionized water using DVP at p-AgSAE, optimal conditions seemed to be as follows: BR buffer of pH 8.0 and initial potential of +100 mV....
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Use of the Silver Solid Amalgam Electrode for Determination of 5-Nitroindazole
 Nováková, Kateřina ; Navrátil, Tomáš ; Hrdlička, V. ; Vyskočil, V. ; Barek, J. ; Chýlková, J.
The voltammetric behavior of 5- nitroindazole (5-NI) has been investigated using mercury meniscus modified (m-AgSAE) silver solid amalgam electrode (inner diameter 0.5 mm). Differential pulse voltammetry (DPV) and cyclic voltammetry (CV) were used for study of electrochemical behavior of 5-NI. Britton-Robinson buffer was found to be the best available supporting electrolyte for 5-NI determination. The reaction mechanism was investigated by CV and by elimination voltammetry with linear scan (EVLS). DPV with optimized working parameters was applied for analysis of model solutions containing 5-NI. The limit of detection was calculated as 0.14 mol L for m-AgSAE. Proposed method was successfully tested for analysis of real water samples spiked by 5-NI.
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