scholarly journals DETECTION OF FALSIFICATION OF HORILKA BY ADMITTANCE SPECTROSCOPY

2021 ◽  
Vol 82 (4) ◽  
pp. 5-7
Author(s):  
Yevhen Pokhodylo ◽  
◽  
Viktor Kuts ◽  
Yuriy Stasyshyn ◽  
◽  
...  
Keyword(s):  
Extreme Values ◽  
Specific Conductivity ◽  
Aqueous Alcohol ◽  
Admittance Spectroscopy ◽  
Frequency Range ◽  
Electrical Parameters ◽  
Reactive Component ◽  
Aqueous Alcohol Solution ◽  
Aqueous Alcohol Solutions ◽  
Characteristic Features

The methods of quality control of horilka by electrical parameters, in particular, dielectric constant, specific conductivity, and imitation components are analyzed. The research results of individual samples of alcohol solutions and horilkas of different brands by the method of admittance spectroscopy were also analyzed. Based on this, methods for detecting falsification of horilka products by the method of admittance spectroscopy are proposed. The reactive component of the control object's ad is selected as an informative parameter. Two types of falsification are analyzed. The first is the falsification of the original horilka by replacing it with an aqueous-alcohol solution. The second - by replacing one brand of horilka with another. The analysis of the obtained results of researches of two types of objects on reactive components of their admittance in the frequency range 100 Hz100 kHz showed the following: characteristic features of dependencies of reactive components on frequency are revealed; they have been found to have extreme values at different frequencies. The reactive component of the admittance of aqueous-alcohol solutions reaches an extreme value at the beginning of the range. The same component of the original horilkas of different brands has extreme values at the end of the range. Based on this, methods for prompt detection of falsifications are proposed.

scholarly journals Spectral study of thione-thiol tautomerization of thiourea in aqueous alcohol solution

2020 ◽  
Vol 99 (3) ◽  
pp. 66-71
Author(s):  
L.E. Kalichkina ◽  
◽  
A.A. Bakibaev ◽  
V.S. Malkov ◽  
◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Isopropyl Alcohol ◽  
Uv Spectroscopy ◽  
Alcohol Solution ◽  
Aqueous Alcohol ◽  
Absorption Bands ◽  
Aqueous Alcohol Solution ◽  
Alcohol Medium ◽  
Aqueous Alcohol Solutions ◽  
Thiol Form

In this work we studied the equilibrium of thione–thiol tautomerization by Raman and UV spectroscopies. This type of tautomerization influences on the course and direction of the reaction between thiourea and other organic compounds. The studies were carried out in water and aqueous alcohol medium. Мethanol, ethanol, propanol-1 and propanol-2 were used as alcohols. Hydrochloric acid was used to protonate thiourea in water and aqueous alcoholic solutions. UV spectroscopy made it possible to establish the tautomer ratio in water and aqueous alcohol solutions as the ratio of the intensities of absorption bands at 236 and 200 nm. There is an increase in the content of the thiol form and a decrease of the thione form observed in the row water-methanol-ethanol-propanol-isopropyl alcohol. The addition of hydrochloric acid to the thiourea water or aqueous alcohol solutions leads to the increase of the thione form and to the decrease of the thiol form in the composition. The thione form of thiourea can be determine by Raman spectra of –C=S group. The thiol form of thiourea is difficult to detect by Raman spectroscopy due to the overlap of the –S–H bond absorption band with alcohols absorption bands.

Comparison of the interactions of positronium and other free radicals with cobalt complexes in aqueous alcohol solutions

1967 ◽  
Vol 16 (10) ◽  
pp. 2103-2110 ◽  
Author(s):  
V. P. Shantarovich ◽  
V. I. Gol'danskii ◽  
Yu. N. Molin ◽  
V. P. Perminov ◽  
G. I. Skubnevskaya
Keyword(s):  
Free Radicals ◽  
Cobalt Complexes ◽  
Aqueous Alcohol ◽  
Aqueous Alcohol Solutions

Oxidative hydroxylation of phosphine in aqueous alcohol solutions of p-benzoquinone

2014 ◽  
Vol 88 (5) ◽  
pp. 764-767 ◽  
Author(s):  
G. S. Polimbetova ◽  
A. K. Borangazieva ◽  
Zh. U. Ibraimova ◽  
E. E. Ergozhin ◽  
B. A. Mukhitdinova
Keyword(s):  
Aqueous Alcohol ◽  
Aqueous Alcohol Solutions

Hydrogenation of Para-Nitrotoluene on Catalytic Systems Containing Oxides of Rare Earth Elements

2021 ◽  
Vol 410 ◽  
pp. 389-393
Author(s):  
Galina M. Kurunina ◽  
Olga M. Ivankina ◽  
Gennady M. Butov
Keyword(s):  
Rare Earth ◽  
Reaction Rate ◽  
High Selectivity ◽  
Nitro Compounds ◽  
Aqueous Alcohol ◽  
Hydrogenation Rate ◽  
Catalytic Systems ◽  
Liquid Phase Hydrogenation ◽  
Aqueous Alcohol Solutions ◽  
Hydrogenation Reactions

This work is devoted to the study of the activity of 1% platinum catalysts containing rare earth element oxides (OREE) - Gd2O3, Ce2O3 and aluminum oxide as a carrier in the hydrogenation reactions of nitro compounds on the example of n-nitrotoluene. These catalytic systems in the conditions of liquid-phase hydrogenation provide high selectivity of the process and practically quantitative yield. The process was controlled by the potentiometric method, the reaction rate was judged by the amount of hydrogen absorbed per unit time. It is found that 20% and higher aqueous alcohol solutions can be used as a solvent during hydrogenation. It was found that the initial hydrogenation rate for 1% Pt/Gd2O3 is 3.2 times higher, and for 1% Pt/Ce2O3 Cerium it is 1.6 times higher relative to the 1% Pt/Al2O3 comparison catalyst.

scholarly journals Practical data correlation of flashpoints of binary mixtures by a reciprocal function: The concept and numerical examples

2011 ◽  
Vol 15 (3) ◽  
pp. 905-910 ◽  
Author(s):  
Mariana Hristova ◽  
Dimitar Damgaliev ◽  
Jordan Hristov
Keyword(s):  
Binary Mixture ◽  
Binary Mixtures ◽  
Alcohol Solution ◽  
Aqueous Alcohol ◽  
Thermodynamic Models ◽  
Data Correlation ◽  
Numerical Examples ◽  
Aqueous Alcohol Solution ◽  
Better Than

Simple data correlation of flashpoint data of binary mixture has been developed on a basic of rational reciprocal function. The new approximation requires has only two coefficients and needs the flashpoint temperature of the pure flammable component to be known. The approximation has been tested by literature data concerning aqueous-alcohol solution and compared to calculations performed by several thermodynamic models predicting flashpoint temperatures. The suggested approximation provides accuracy comparable and to some extent better than that of the thermodynamic methods.

Flash point and ignition point of aqueous alcohol solutions

1977 ◽  
Vol 11 (7) ◽  
pp. 993-995
Author(s):  
L. A. Pyreseva ◽  
N. A. Tereshina ◽  
V. V. Bachkova ◽  
A. Ya. Korol'chenko
Keyword(s):  
Flash Point ◽  
Aqueous Alcohol ◽  
Ignition Point ◽  
Aqueous Alcohol Solutions
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