Use of hybrid materials in the trace determination of As(V) from aqueous solutions: An electrochemical study

A simple, rapid and sensitive spectrophotmetric method for trace determination of salbutamol (SAL) in aqueous solution and in pharmaceutical preparations is described. The method is based on the diazotization coupling reaction of the intended compound with 4-amino benzoic acid (ABA) in alkaline medium to form an intense orange, water soluble dye that is stable and shows maximum absorption at 410 nm. A graph of absorbance versus concentration indicates that Beer’s law is obeyed over the concentration range of 0.5-30 ppm, with a molar absorbtivity 3.76×104 L.mol-1 .cm-1 depending on the concentration of SAL. The optimum conditions and stability of the colored product have been investigated and the method was applied successfully to the determination of SAL in dosage forms.

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LUMINESCENT DETERMINATION OF SUGAR IN NATURAL HONEY

Izvestia Ufimskogo Nauchnogo Tsentra RAN ◽

10.31040/2222-8349-2020-0-4-29-32 ◽

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.

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Simple Method for Spectrophotometric Determination of Benzidine in Aqueous Solutions by Coupling with Β-Naphthol

Journal of Al-Nahrain University-Science ◽

10.22401/jnus.14.2.05 ◽

2011 ◽

Vol 14 (2) ◽

pp. 43-50

Author(s):

Ameera .H. Hamed ◽

Keyword(s):

Aqueous Solutions ◽

Spectrophotometric Determination ◽

Simple Method

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Sorption of Lead by the Selective Ion Exchanger Ostsorb DETA

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19921393 ◽

1992 ◽

Vol 57 (7) ◽

pp. 1393-1404 ◽

Cited By ~ 3

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.

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