Kinetic Study of the Oxidation of Glycine by Permanganate Ions in Acid Medium

1996 ◽  
Vol 61 (2) ◽  
pp. 232-241 ◽  
Author(s):  
Maria J. Insausti ◽  
Fernando Mata-Pérez ◽  
Maria P. Alvarez-Macho
Keyword(s):  
Kinetic Study ◽  
Acid Medium ◽  
Spectrophotometric Method ◽  
Inflection Point ◽  
Autocatalytic Reaction ◽  
Soluble Form ◽  
Kinetic Curves

The oxidation of glycine by permanganate ions was studied in a buffered solution at pH 2.2. An autocatalytic reaction was observed, autocatalyzed by a soluble form of Mn(IV). Autocatalytic S-shaped kinetic curves were obtained by the spectrophotometric method and characterized by the time ti vs concentration in the inflection point.

Étude cinétique de la N-chloration de la diméthylamine et de la diéthylamine en phase aqueuse

1989 ◽  
Vol 67 (5) ◽  
pp. 786-791 ◽  
Author(s):  
Denise Matte ◽  
Bernard Solastiouk ◽  
André Merlin ◽  
Xavier Deglise
Keyword(s):  
Kinetic Study ◽  
Aqueous Medium ◽  
Acid Medium ◽  
Spectrophotometric Method ◽  
Hypochlorous Acid ◽  
Chloride Ions ◽  
Proton Exchange ◽  
Basic Medium ◽  
Protonated Amine ◽  
Phase Aqueuse

A complete kinetic study of the N-chlorination, in aqueous medium, of dimethylamine and diethylamine by a stopflow spectrophotometric method is presented. In neutral or basic medium our experimental results can be interpreted by two kinetically indistinguishable mechanisms; the reactions between protonated amine (R2NH2+) and hypochlorite ion (ClO−) and the reaction between R2NH and hypochlorous acid (ClOH) are equivalent because of the fast equilibrium of proton exchange existing between the two groups of possible reactants [Formula: see text]. In acid medium, in the presence of chloride ions, we observed a reaction by aqueous chlorine (Cl2) on the amine (Cl2 + R2NH → chloramine).Keywords: kinetics, N-chlorination, amines, aqueous medium.

Collaborative Study of the Spectrophotometric Determination of Procainamide Hydrochloride

1976 ◽  
Vol 59 (4) ◽  
pp. 807-810
Author(s):  
Jeffrey C Hamm
Keyword(s):  
Sodium Hydroxide ◽  
Acid Medium ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Collaborative Study ◽  
Dosage Forms ◽  
Standard Deviations

Abstract The USP analysis for procainamide HCl is titrimetric and relatively nonspecific, capsule and tablet dyes may interfere, and the method is not applicable to coated tablets. In the spectrophotofluorometric method the sample deteriorates when exposed to a xenon source. In the ultraviolet spectrophotometric method reported here, the sample is dispersed in acid medium, possible interferences are extracted in chloroform, base is added, procainamide is extracted in chloroform, the residue is dissolved in sodium hydroxide, and the compound is measured by absorption at 272 nm and comparison with a standard. Recoveries of standards added to capsule, tablet, and injection composites ranged from 99.3 to 102%. Twelve collaborators reported duplicate assay results for all 3 dosage forms with per cent standard deviations for 5 samples ranging from 1.01 to 1.27%. The method has been adopted as official first action.

An equilibrium and kinetic study of the methylene blue-ferrocyanide reaction in acid medium

1990 ◽  
Vol 94 (10) ◽  
pp. 4116-4119 ◽  
Author(s):  
John R. Sutter ◽  
Wynetta. Spencer
Keyword(s):  
Methylene Blue ◽  
Kinetic Study ◽  
Acid Medium

scholarly journals Spectrophotometric determination of phosphorus in coal and coal ash using bismuth-phosphomobybdate complex

2003 ◽  
Vol 68 (1) ◽  
pp. 65-73 ◽  
Author(s):  
Randjel Mihajlovic ◽  
Natasa Ignjatovic ◽  
Marija Todorovic ◽  
Ivanka Holclajtner-Antunovic ◽  
Vesna Kaljevic
Keyword(s):  
Aqueous Solution ◽  
Ascorbic Acid ◽  
Acid Medium ◽  
Spectrophotometric Method ◽  
Methyl Ketone ◽  
Coal Ash ◽  
Molar Absorptivity ◽  
Stable Complex ◽  
Tolerance Limits

A modified spectrophotometric method using the bismuth phosphomolybdate complex for the determination of phosphorus in coal and coal ash is suggested. Bismuth together with phosphate and molybdate forms a very stable complex in acid medium which turns blue ("molibdenum blue") by reduction with ascorbic acid. The apparent molar absorptivity of PBiMo is 1.66x104 dm3 mol-1cm-1 at 720 nm and 2.10x104 dm3 mol-1cm-1 at 670 nm isobutyl methyl ketone (MIBK). Interference caused by the ions present are within the tolerance limits (?2 %). Beer?s law is obeyed in the for concentration range to 0.6 ?g/mL (aqueous solution) and to 1.2 ?g/mL P (MIBK). The sensitivity of the proposed method is 0.0078 ?g/mL (aqueous solution) and 0.0066 ?g/mL (MIBK).

Kinetic study of the polymerization of ethyl acrylate in an aqueous nitric acid medium

2005 ◽  
Vol 99 (1) ◽  
pp. 218-224 ◽  
Author(s):  
G. V. Ramana Reddy ◽  
J. Arun ◽  
Jayakishore Panda
Keyword(s):  
Nitric Acid ◽  
Kinetic Study ◽  
Acid Medium ◽  
Ethyl Acrylate ◽  
Nitric Acid Medium ◽  
Aqueous Nitric Acid

scholarly journals Kinetic Study of Hydrolysis of Tri-2,5-diethoxy Aniline Phosphate (An Organo Phosphorus Pesticide) in Acid Medium

2010 ◽  
Vol 2 (1) ◽  
Author(s):  
Alka Tangri ◽  
Pradeep Mishra ◽  
Praveen Kumar
Keyword(s):  
Kinetic Study ◽  
Acid Medium ◽  
Hydrolysis Of
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