The methyl(cyclam)nickel(III) dication in aqueous solutions: determination of the volume of reaction and volume of activation for the homolysis of the nickel-carbon bond. A pulse-radiolysis study

1990 ◽  
Vol 29 (20) ◽  
pp. 4156-4158 ◽  
Author(s):  
Rudi Van Eldik ◽  
Haim Cohen ◽  
Avraham Meshulam ◽  
Dan Meyerstein
Keyword(s):  
Aqueous Solutions ◽  
Pulse Radiolysis ◽  
Carbon Bond

LUMINESCENT DETERMINATION OF SUGAR IN NATURAL HONEY

2020 ◽  
Vol 0 (4) ◽  
pp. 29-32
Author(s):  
B.M. GAREEV ◽  
◽  
A.M. ABDRAKHMANOV ◽  
G.L. SHARIPOV ◽  
◽  
...  
Keyword(s):  
Quantum Dots ◽  
Laboratory Test ◽  
Aqueous Solutions ◽  
Analytical Method ◽  
Sugar Content ◽  
Carbon Quantum Dots ◽  
Photoluminescence Intensity ◽  
Sucrose Content ◽  
Natural Honey

The photoluminescence of carbon quantum dots synthesized from natural honey and mixtures of honey and sugar has been studied. An increase in the sugar content leads to a decrease in the photoluminescence intensity without changing the shape of the luminescence spectrum of these quantum dots aqueous solutions, which is associated with a decrease in the yield of their synthesis in the sugar presence. The discovered effect can be used to detect sugar in honey. When examining five different market samples of flower honey using this method, two of them showed a significant decrease in the photoluminescence intensity. A laboratory test for compliance with GOST 19792-2017 Standard requirements established an excess of the sucrose content in these samples. Luminescent determination of sugar in honey does not require complicated equipment and can be used to develop a new analytical method for determining the sugar content in counterfeit natural honey.

Sorption of Lead by the Selective Ion Exchanger Ostsorb DETA

1992 ◽  
Vol 57 (7) ◽  
pp. 1393-1404 ◽  
Author(s):  
Ladislav Svoboda ◽  
Jan Uhlíř ◽  
Zdeněk Uhlíř
Keyword(s):  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Functional Groups ◽  
Ion Exchanger ◽  
Preconcentration Procedure ◽  
Bead Cellulose

The properties of Ostsorb DETA, a selective ion exchanger based on modified bead cellulose with chemically bonded diethylenetriamine functional groups, were studied, and its applicability to the preconcentration of trace amounts of lead from aqueous solutions was verified. The conditions of the preconcentration procedure in the column and batch modes were optimized for this purpose. The results obtained were applied to the determination of lead in phosphoric acid.

Pulse radiolysis study of dithio-oxamide in aqueous solutions

2000 ◽  
Vol 26 (4) ◽  
pp. 309-318 ◽  
Author(s):  
G. R. Dey ◽  
D. B. Naik ◽  
P. Dwibedy ◽  
K. Kishore
Keyword(s):  
Aqueous Solutions ◽  
Pulse Radiolysis
Sign in / Sign up

Export Citation Format

Share Document