Luminescence kinetic and association equilibria of lanthanide ions in aqueous solutions. II. Determination of the formation constant of Tb acetato complex by means of luminescence lifetime measurement

1985 ◽  
Vol 14 (1) ◽  
pp. 67-72 ◽  
Author(s):  
M. Baumann ◽  
P. Becker ◽  
B. A. Bilal
Keyword(s):  
Aqueous Solutions ◽  
Formation Constant ◽  
Lifetime Measurement ◽  
Lanthanide Ions ◽  
Luminescence Lifetime ◽  
Luminescence Kinetic ◽  
Association Equilibria

Luminescence kinetics and association equilibria of lanthanide ions in aqueous solutions

1984 ◽  
Vol 13 (7) ◽  
pp. 481-491 ◽  
Author(s):  
P. Becker ◽  
B. A. Bilal
Keyword(s):  
Aqueous Solutions ◽  
Lanthanide Ions ◽  
Luminescence Kinetics ◽  
Association Equilibria

Competitive adsorption of boric acid and chromate onto alumina in aqueous solutions

2013 ◽  
Vol 69 (2) ◽  
pp. 378-384 ◽  
Author(s):  
A. Demetriou ◽  
I. Pashalidis
Keyword(s):  
Aqueous Solutions ◽  
Boric Acid ◽  
Formation Constant ◽  
Competitive Adsorption ◽  
Alumina Surface ◽  
Atmospheric Conditions ◽  
Surface Complexes ◽  
Surface Data ◽  
Reaction Constant

The competitive adsorption of boric acid and chromate from aqueous solutions by alumina has been investigated by spectrophotometry at pH 8, ionic strength = 0.0, 0.1 and 1.0 M NaClO4, T = 22 ± 3 °C and under normal atmospheric conditions. The experimental data show that addition of excess boric acid in the system leads to the increase of Cr(VI) concentration in solution, indicating the replacement of adsorbed chromate by boron on the alumina surface. Data evaluation results in the determination of the competition reaction constant and the formation constant of the Cr(VI) surface complexes, which are logKCr(VI)–B(III) = −3.5 ± 0.2 and logβ*Cr = 7.6 ± 0.3, respectively.

Direct determination of traces of lanthanide ions in aqueous solutions by laser-induced time-resolved spectrofluorimetry

1989 ◽  
Vol 220 ◽  
pp. 235-241 ◽  
Author(s):  
T. Berthoud ◽  
P. Decambox ◽  
B. Kirsch ◽  
P. Mauchien ◽  
C. Moulin
Keyword(s):  
Aqueous Solutions ◽  
Direct Determination ◽  
Lanthanide Ions ◽  
Time Resolved

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.

Photometric cyclic-injection determination of phosphate and silicate ions simultaneously present in aqueous solutions

2009 ◽  
Vol 64 (6) ◽  
pp. 580-584 ◽  
Author(s):  
A. V. Bulatov ◽  
A. A. Tsapko ◽  
L. N. Moskvin
Keyword(s):  
Aqueous Solutions ◽  
Cyclic Injection

Determination of hydration stoichiometries and molar volumes of hydrated complexes in aqueous solutions of cellulosic ether polymers

2010 ◽  
Vol 81 (3) ◽  
pp. 578-583 ◽  
Author(s):  
Alphonso Higuera ◽  
Robert A. Bellantone
Keyword(s):  
Aqueous Solutions ◽  
Molar Volumes ◽  
Hydrated Complexes
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