Conductimetric studies on aqueous solutions of electrolytes. I. Conductivities of copper sulphate

1983 ◽  
Vol 61 (2) ◽  
pp. 267-268 ◽  
Author(s):  
Victor Hugo Acevedo ◽  
Juana Albarracín De Morán ◽  
Leopoldo Armando Sales
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Copper Sulphate ◽  
Maximum Concentration ◽  
Temperature Range ◽  
Ph Values ◽  
Solutions Of Electrolytes

The specific conductivities and pH values of copper sulphate solutions in water were measured in the temperature range from 10 °C to 50 °C. The data, previously corrected by hydrolysis, were analyzed by means of the Lee Wheaton theory.This fit, for the evaluation of Λ0, R, and KA parameters, is quite satisfactory up to a maximum concentration of 25 × 10−4 moldm−3 and the agreement between experimental data and the literature value for 25 °C is acceptable.

Kinetics analysis of the decay of phenylhydrazonopropanedinitrile addition products with thiols in aqueous solutions

1989 ◽  
Vol 54 (12) ◽  
pp. 3387-3396 ◽  
Author(s):  
Marián Antalík ◽  
Ernest Šturdík ◽  
Dušan Podhradský ◽  
Ingrid Poleková ◽  
Ľudovít Drobnica
Keyword(s):  
Experimental Data ◽  
Carbon Atom ◽  
Aqueous Solutions ◽  
Decisive Role ◽  
Kinetic Description ◽  
Kinetics Analysis ◽  
Imino Group ◽  
Ph Values ◽  
Ph Dependent ◽  
Good Agreement

The reactions of phenylhydrazonopropanedinitriles with thiols are reversible and with increasing pH-values of aqueous solutions the equilibrium is shifted them to the side of the reactants. A mechanism of the decay of corresponding addition products was proposed and the kinetic description based on this mechanism is in good agreement with the obtained experimental data. From the viewpoint of the decay, the pH-dependent dissociation of the proton of the imino group formed by addition of thiol to the nitrile carbon atom plays a decisive role. The obtained knowledge is useful with respect to the use of phenylhydrazonopropanedinitriles as affinants for selective and reversible sorption of low-molecular thiols and thiol-proteins in affinity chromatography as well as for the study of the mechanism of the effect of these substances in oxidative and photosynthetic phosphorylation and biological systems in general.

scholarly journals Adsorption of Triclocarban on Pristine and Irradiated MWCNTs in Aqueous Solutions

2019 ◽  
Vol 70 (8) ◽  
pp. 2835-2842 ◽  
Author(s):  
Ion Ion ◽  
Raluca Madalina Senin ◽  
Georgeta Ramona Ivan ◽  
Sanda Maria Doncea ◽  
Michael Patrick Henning ◽  
...  
Keyword(s):  
Experimental Data ◽  
Organic Matter ◽  
Humic Acid ◽  
Aqueous Solutions ◽  
Natural Organic Matter ◽  
Environmental Conditions ◽  
Sorption Process ◽  
Ph Values ◽  
Different Temperatures ◽  
The Impact

The adsorption of triclocarban was investigated on pristine and irradiated MWCNTs, at different temperatures, in aqueous synthetic samples at different pH values and for different concentrations of humic acid (HA) from natural organic matter. Commonly used models of the adsorption isotherms, Freundlich and Langmuir were selected to fit the experimental data. The effects of TCC concentration, of the temperature and of the concentration of humic acid from natural organic matter were tested to study the impact of the environmental conditions over the sorption process.

scholarly journals Water-absorbing materials based on polymer hydrogel and bentonite

2020 ◽  
Vol 64 (6) ◽  
pp. 678-684
Author(s):  
E. V. Vorobieva
Keyword(s):  
Composite Materials ◽  
Moisture Content ◽  
Aqueous Solutions ◽  
Rheological Properties ◽  
Polymer Hydrogel ◽  
Temperature Range ◽  
Degree Of Swelling ◽  
Absorbing Materials ◽  
Solutions Of Electrolytes

The article deals with the production, sorption and rheological properties of composite materials based on polymer hydrogel and bentonite. It is shown that bentonite prevents the collapse of the hydrogel in aqueous solutions of electrolytes and leads to an increase in the moisture content after the collapse. After several repeated cycles of swelling in water, followed by drying at 60 and 110 °C, the degree of swelling of the composite is higher than that of the hydrogel. In the temperature range from 20 to 40 °C, the polymer hydrogel and the composite are able to withstand at least ten cycles of swelling and drying without changing the degree of swelling.

scholarly journals Vapor Pressure of Saturated Aqueous Solutions of Potassium Sulfate from 310 K to 345 K

2011 ◽  
Vol 2011 ◽  
pp. 1-4 ◽  
Author(s):  
Matias O. Maggiolo ◽  
Francisco J. Passamonti ◽  
Abel C. Chialvo
Keyword(s):  
Experimental Data ◽  
Vapor Pressure ◽  
Aqueous Solutions ◽  
Water Activity ◽  
Experimental Evaluation ◽  
Experimental Results ◽  
Potassium Sulfate ◽  
Temperature Range ◽  
Analytical Expressions

The experimental evaluation of the vapor pressure of saturated aqueous solutions of potassium sulfate was carried out in the range of temperatures 310 K≤T≤345 K. The experimental data were used to determine the corresponding values of the water activity in such solutions. The analytical expressions as a function of temperature of both, vapor pressure and water activity, were obtained from the correlation of the experimental results. The vapor pressure expression was also extrapolated to a different temperature range in order to make a comparison with the results obtained by other authors.

Gas holdup in bubbled beds of aqueous solutions of electrolytes

1977 ◽  
Vol 42 (9) ◽  
pp. 2642-2650
Author(s):  
F. Kaštánek ◽  
J. Kratochvíl ◽  
J. Pata ◽  
M. Rylek
Keyword(s):  
Aqueous Solutions ◽  
Gas Holdup ◽  
Solutions Of Electrolytes

The metachor as a characteristic of the association of electrolytes in aqueous solutions

1984 ◽  
Vol 49 (5) ◽  
pp. 1061-1078 ◽  
Author(s):  
Jiří Čeleda ◽  
Stanislav Škramovský
Keyword(s):  
Aqueous Solutions ◽  
Apparent Volume ◽  
Solutions Of Electrolytes ◽  
Molal Volumes ◽  
The Difference ◽  
High Concentrations ◽  
Experimental Values ◽  
Suitable Characteristic ◽  
Association Of Ions ◽  
Very High

Based on the earlier paper introducing a concept of the apparent parachor of a solute in the solution, we have eliminated in the present work algebraically the effect which is introduced into this quantity by the additivity of the apparent molal volumes. The difference remaining from the apparent parachor after substracting the contribution corresponding to the apparent volume ( for which the present authors suggest the name metachor) was evaluated from the experimental values of the surface tension of aqueous solutions for a set of 1,1-, 1,2- and 2,1-valent electrolytes. This difference showed to be independent of concentration up to the very high values of the order of units mol dm-3 but it was directly proportional to the number of the free charges (with a proportionality factor 5 ± 1 cm3 mol-1 identical for all studied electrolytes). The metachor can be, for this reason, a suitable characteristic for detection of the association of ions and formation of complexes in the solutions of electrolytes, up to high concentrations where other methods are failing.

HPLC Analysis of Oxytetracycline Residues in Honey

1986 ◽  
Vol 49 (5) ◽  
pp. 383-388 ◽  
Author(s):  
PETER SPORNS ◽  
SUET KWAN ◽  
LAWRENCE A. ROTH
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Aqueous Solutions ◽  
High Performance ◽  
Hplc Analysis ◽  
Extraction Procedure ◽  
Hplc Method ◽  
Limits Of Detection ◽  
Ph Values ◽  
Double Extraction

Oxytetracycline (OTC), also known commercially as Terramycin, was determined to be more stable in honey than in buffered aqueous solutions at similar pH values and temperatures. A rapid high performance liquid chromatography (HPLC) method was developed to detect and quantitate OTC using a 1:1 dilution (wt/wt) of honey samples in water. Using 355 nm as the wavelength of detection, amounts as low as 0.5 μg/ml could be detected in the above solution. The limits of detection were lowered considerably by a double extraction procedure.

scholarly journals Experimental data on the removal of acid orange 10 dye from aqueous solutions using TiO2/Na-Y zeolite and BiVO4/Na-Y zeolite nanostructures: A comparison study

Data in Brief ◽  
2021 ◽  
Vol 35 ◽  
pp. 106869
Author(s):  
Behzad Rahimi ◽  
Nayereh Rezaie-Rahimi ◽  
Negar Jafari ◽  
Ali Abdolahnejad ◽  
Afshin Ebrahimi
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Comparison Study ◽  
Y Zeolite ◽  
Acid Orange ◽  
Acid Orange 10
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