APLICATION OF CHROMATOGRAPHICAL METHODS IN ANALYSIS OF PHENOLIC COMPOUNDS IN ROSE EXTRACTS
R. Nowak
Department of Pharmaceutical Botany, Medical University,
Staszica st. 4, 20-081 Lublin, Poland
Phenolics and flavonoids are common substituens of plants. Because of their biological importance, many studies of their separation and determination have been carried out. High-performance liquid chromatography is the most often used technique, while little attention has been devoted to thin-layer chromatography.
The aim of this study is to investigate the best elution condition in order Continue Reading »
Model of hydrogen-bonding effects
in liquid-solid chromatography
N.V. Nikolenko, A.P. Korpach
Ukrainian State Chemical Technology University,
Gagarin av. 8, 49005 Dniepropetrovsk, Ukraine,
e-mail: nick@academy.dp.ua
At present Snyder retention model, which is based on displacement of adsorbed mobile phase molecules by adsorbing solute molecules and localization effects, provides an adequate physical basis to describe different adsorbents. However, in addition to displacement and localization effects, the hydrogen bonding between sample and solute mol Continue Reading »
INFLUENCE OF N-BUTANOL AND N-NONANOL CONCENTRATION ON PROFILES OF THE LOCAL VELOCITIES OF BUBBLES
M. Krzan, K. Malysa
Institute of Catalysis and Surface Chemistry Polish Academy of Sciences,
ul. Niezapominajek 8, 30-239 Krakow, Poland
e-mail: ncmalysa@cyf-kr.edu.pl
Description of the motion of bubbles is one of the basic problems in fluid mechanics that has bearing on a wide range of applications from the environmental protection to chemical engineering. Despite that bubbles play a significant role in a wide range of industrial processes there still doesn’t exist a general theory describing mo Continue Reading »
ADSORPTION PECULIARITIES OF COLLOIDAL
SURFACE-ACTIVE MATTERS
ON HIGH-DISPERSION ADSORBENTS
I.Ye. Opaynych, A.M. Ukrainets, Z.M. Yaremko, I.I. Maleyev
Department of Colloidal Chemistry, Lviv Ivan Franko National University,
Kyryla i Mephodia st. 6, 79005 Lviv, Ukraine, opaynych@galca.lviv.ua
Obtaining suspensions, characterizing colloidal degree of dispersibility, is conjugated as usually with the application of effective dispersing agent, capable to modify a surface of technical carbon. It is connected with the set of difficulties stipulated by high lyophilic of technical carbo Continue Reading »
THE INFLUENCE OF THE MOLYBDENUM CONTENTS
OF DESONOX CATALYST
A. Marcewicz-Kuba, D. Nazimek
Faculty of Chemistry, Maria Curie-Sklodowska University,
Maria Curie-Sklodowska sq. 3, 20-031 Lublin, Poland,
e-mail: amarcewi@hermes.umcs.lublin.pl
The method proposed for the removal of SO2 from combustion gases, described in this paper, is quite different from wet classical desulphurization methods. This paper reports the studies on the influence of molybdenum and vanadium concentration on the catalytic activity of DESONOX catalysts (in the course of DESOX reaction). It also investigates Continue Reading »
PREDICTION OF HENRY’S LAW CONSTANTS
BAISING ON THE CORRESPONDING STATES THEOREM
V.V. Kutarov, B.M. Kats
Physical Research Institute, I.I. Mechnikov National University of Odessa,
Pastera st. 27, 65026 Odessa, Ukraine; e-mail kats@tm.Odessa.ua
In the classical approximation the obvious statistic expressions for calculation and prediction of the Henry coefficient depend on the adsorbate molecule structure. Such expressions were obtained under investigation of adsorption of monoatomic, diatomic and some simplest polyatomic molecules, as well as for molecules possessing Continue Reading »