Zobrazeno 1 - 10
of 85
pro vyhledávání: '"Antonín Berka"'
Publikováno v:
Electroanalysis. 5:171-176
Adsorptive stripping tensammetry at a hanging mercury drop electrode is described for aqueous solutions of various motor oils. The method can be used for the determination of oils in polluted waters in the concentration range from 0.4–0.8 to 3.5–
Publikováno v:
Collection of Czechoslovak Chemical Communications. 44:2603-2611
Article without abstract
Publikováno v:
Collection of Czechoslovak Chemical Communications. 46:2509-2518
Glycolaldehyde was found to be oxidized by manganese(III) sulphate with exchange of two electrons to give formaldehyde and formic acid. The kinetics of the reaction was studied and the reaction mechanism deduced. A convenient procedure is suggested f
Publikováno v:
Microchemical Journal. 20:421-427
A method for the analysis of mixtures of malonic and oxalic and malonic and formic acids has been developed. The method is based on stepwise oxidation with excess permanganate in alkaline [Eqs. (1) and (3)] and acid [Eq. (2)] media.
Publikováno v:
Collection of Czechoslovak Chemical Communications. 44:1134-1145
Wie nachgewiesen wurde, wird die Zitronensaure mit Mangan(III)-sulfat nach der Gleichung (COOH-CH2)2C(OH)COOH + 14 Mn3+ + 5 H2O → 2 HOOCH + 4 CO2 + 14 Mn2+ + 14 H+ oxydiert. Es wurde die Kinetik untersucht, der Mechanismus dieser Reaktion vorgeschl
Publikováno v:
Microchemical Journal. 22:484-488
The reaction of hexaquomanganese(III) ion with hydroquinone, p-aminophenol, metol, pyrocatechol, resorcinol, and phloroglucinol was studied. It has been found that the first three substances are oxidized quantitatively with the exchange of two electr
Publikováno v:
Collection of Czechoslovak Chemical Communications. 41:3546-3554
Publikováno v:
Collection of Czechoslovak Chemical Communications. 49:954-962
Model mixtures of oxalic and citric acids were used to verify the applicability of the logarithmic extrapolation method for 2nd order reactions to the analysis of mixtures of pairs of substances reacting with the oxidant employed with the exchange of
Publikováno v:
Microchemical Journal. 23:104-109
Optimum conditions have been found for the determination of the titer of 0.005 N solutions of hexaquomanganese(III) ion by potentiometric titration of ferrous chloride. The accuracy and reproducibility of this method were studied. A new method of det
Publikováno v:
Microchemical Journal. 20:353-359
The oxidation of malonic acid with permanganate was studied under various acidity conditions. Analytical procedures, based on oxidation with excess reagent in a sodium carbonate medium and titration of the oxalate or manganese dioxide formed or of un