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1
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Coulometric Determination of Sulphur Compounds Using the Induced lodine-Azide Reaction

100%
Ciesielski W., Department of Instrumental Analysis U. o. Ł.
Acta Universitatis Lodziensis. Folia Chimica
|
2004
|
vol. 13
PL
Wydrukowano z dostarczonych Wydawnictwu UŁ gotowych materiałów
EN
The review summarizes application of coulometry for determination of the sulphur compounds that induce the iodine-azide reaction. The article discusses advantages of the coulometric method. The influence of potassium iodide on induction coefficients is also described. Moreover, determination ranges of several inductors are presented and sensitivities of determination by different methods are compared.
2
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Coulometric determination of dithiphosphates with the use of the induced iodine-azide reaction

63%
Ciesielski W., Jędrzejewski W., Department of Instrumental Analysis U. o. Ł.
Acta Universitatis Lodziensis. Folia Chimica
|
1993
|
vol. 10
EN
The characteristics of potassium diethyl- and dibuthyldithiophosphates as the inductors of iodine-azide reaction carried out electrolytically have been presented. The influence of the pH and concentrations of azide and iodide ions on the course of reaction was examined. The determinations have been carried out in the range of 1-20 nmol.
PL
Przedstawiono charakterystykę dietylo- i dibutyloditiofosforanów jako induktorów reakcji jodo-azydkowej. Zbadano wpływ pH oraz stężeń azydku i jodku na przebieg reakcji. Oznaczenia kulometryczne przeprowadzono w zakresie 1-20 nmoli w próbce.
3
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Analysis of Organophosphorus Compounds. 1. Application of Iodine-Azide Reaction for Detection of Thiophosphoorganic Compounds in Thin-Layer Chromatography

51%
Kotyński A., Kudzin Z. H., Ciesielski W., Andrzej Kotyński - Department o f Bioinorganic Chemistry M. U. o. f. Ł., Zbigniew H. Kudzin - Institute of Chemistry U. o. Ł., Witold Ciesielski - Institute of Chemistry U. o. Ł.
Acta Universitatis Lodziensis. Folia Chimica
|
2004
|
vol. 13
PL
Wydrukowano z dostarczonych Wydawnictwu UŁ gotowych materiałów
4
Content available remote

Electrochemical oxidation of methylthiomethyleneisoquinolinium chloride - the first water soluble alkylthiomethylene substituted ammonium salt

45%
Smarzewska S., Skrzypek S., Bachowska B., Bałczewski P., Ciesielski W.
Open Chemistry
|
2011
|
vol. 9
|
issue 5
840-845
EN
Electrochemical oxidation of methylthiomethyleneisoquinolinium chloride (MTMIQ), the first alkylthiomethyl substituted ammonium salt, which is fully miscible with water has been investigated by voltammetric (SWV) method using glassy carbon electrode. On the electrode, MTMIQ undergoes oxidation at the potential near Ep = 0.07V (vs. Ag/AgCl/3 M KCl). The influence of the pH of buffers, amplitude, frequency, step potential on the received signal was studied. The best results were obtained with a citrate buffer at a pH of 5. The oxidation peak current used for MTMIQ voltammetric determination was in the range of 2–8×10−5 mol L−1, LOD = 3.7×10−6, LOQ = 1.2×10−5. The product of the oxidation was accumulated at the working electrode and was investigated by spectroscopic method. Mechanistic pathways of the oxidation have been proposed. [...]
5
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Voltammetric behavior and quantitative determination of ambazone concentrations in urine and in a pharmaceutical formulation

45%
Smarzewska S., Guziejewski D., Skowron M., Skrzypek S., Ciesielski W.
Open Chemistry
|
2014
|
vol. 12
|
issue 12
1239-1245
EN
The use of square wave adsorptive stripping voltammetry (SWAdSV) in conjunction with a cyclic renewable silver amalgam film electrode (Hg(Ag)FE) for the analytical determination of ambazone in urine samples and pharmaceutical formulations is described. A single reduction peak in Britton-Robinson buffer at pH 4.0 was detected at about −1.4 V versus Ag/AgCl. Mechanistic studies have shown that the compound can act as an electrocatalyst. The method was validated. The analytical curve was linear in the concentration range from 1.0×10−9 to 1.0×10−7 mol L−1. The detection and quantification limits were found to be 3.0×10−10 mol L−1 and 1.0×10−9 mol L−1, respectively. The proposed method was successfully applied to ambazone determination in real samples.
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