A method for the potentiometric determination of dimethylamine, acetic acid, and hydrochloric acid content of regenerated dimethylacetamide

1981 ◽  
Vol 13 (1) ◽  
pp. 69-71 ◽  
Author(s):  
G. N. Nosolyuk ◽  
T. L. Protsenko ◽  
A. K. Dibrova
Keyword(s):  
Acetic Acid ◽  
Hydrochloric Acid ◽  
Acid Content ◽  
Potentiometric Determination

Flow Injection Potentiometric Determination of Coke Acidity and Acetic Acid Content in Vinegar Using an Antimony Electrode

1996 ◽  
Vol 29 (5) ◽  
pp. 711-724 ◽  
Author(s):  
Milton Duffles Capelato ◽  
Antonia Marli dos Santos ◽  
Orlando Fatibello-Filho ◽  
Romualdo Gama
Keyword(s):  
Acetic Acid ◽  
Flow Injection ◽  
Acid Content ◽  
Potentiometric Determination ◽  
Antimony Electrode ◽  
Acetic Acid Content

Rapid and Simple Determination of Oxyphenbutazone in Dosage Forms by Biamperometric Titration

1986 ◽  
Vol 69 (2) ◽  
pp. 191-192
Author(s):  
Daniela Šebková ◽  
Luděk Šafařík
Keyword(s):  
Acetic Acid ◽  
Hydrochloric Acid ◽  
Glacial Acetic Acid ◽  
Platinum Electrode ◽  
Potassium Bromide ◽  
Dosage Forms ◽  
End Point

Abstract Oxyphenbutazone was determined in the presence of glacial acetic acid, hydrochloric acid, and potassium bromide by bromometric titration with biamperometric end point indication. The course of the titration was followed with double platinum electrode with 100 mV of polarizing voltage

Simultaneous determination of pentoxifylline and three metabolites in biological fluids by liquid chromatography.

1989 ◽  
Vol 35 (2) ◽  
pp. 298-301 ◽  
Author(s):  
W E Lambert ◽  
M A Yousouf ◽  
B M Van Liedekerke ◽  
J E De Roose ◽  
A P De Leenheer
Keyword(s):  
Acetic Acid ◽  
Liquid Chromatography ◽  
Hydrochloric Acid ◽  
Simultaneous Determination ◽  
Biological Fluids ◽  
Internal Standard ◽  
Pharmacokinetic Studies ◽  
Plasma Samples ◽  
Liquid Chromatographic

Abstract We describe a sensitive and specific liquid-chromatographic assay for pentoxifylline and three of its metabolites in human plasma and urine. Addition of hydrochloric acid to the sample before extraction, and incorporation of acetic acid in the chromatographic eluent, allow the simultaneous determination of the four compounds plus an internal standard in one chromatographic run. Unlike gas-chromatographic procedures, this method does not involve derivatization no similar analysis of serum or plasma samples has been described before now. The method has been applied successfully to routine analysis and to pharmacokinetic studies.

Potentiometric determination of equilibrium constants of bases and perchlorates of protonated bases in glacial acetic acid using Superquad

2003 ◽  
Vol 375 (6) ◽  
pp. 826-830
Author(s):  
Giaan A. Álvarez-Romero ◽  
Alberto Rojas-Hernández ◽  
Guillermo A. Vázquez ◽  
Ma. Teresa Ramírez-Silva
Keyword(s):  
Acetic Acid ◽  
Glacial Acetic Acid ◽  
Equilibrium Constants ◽  
Potentiometric Determination

The nutrition of Zebu cattle Part II. The techniques of digestibility trials with special reference to sampling, preservation and drying of faeces

1961 ◽  
Vol 56 (1) ◽  
pp. 93-97 ◽  
Author(s):  
C. D. Juko ◽  
R. M. Bredon ◽  
B. Marshall
Keyword(s):  
Acetic Acid ◽  
Hydrochloric Acid ◽  
Special Reference ◽  
Nitrogen Content ◽  
Crude Protein ◽  
Dry Matter ◽  
Room Temperature ◽  
Zebu Cattle

Some techniques of sampling, preserving, drying and for determination of nitrogen content of faeces were investigated.It was found that any sample between 100 and 600 g., made up of 10 g. subsamples taken at random, is satisfactory.Untreated faeces and those preserved by the addition of acetic acid, hydrochloric acid or toluene were dried in a large oven at 80° C. and compared with untreated samples dried at 105° C. for 8 hr. Duplicate samples of those dried at 80° C. were exposed to room temperature for 7 hr. and then dried. When dry-matter and crude-protein contents were compared no significant differences were found between the three groups.

Potentiometric Determination of Vitamin C in Highly Colored Products

1964 ◽  
Vol 47 (4) ◽  
pp. 754-755
Author(s):  
William S Hardesty
Keyword(s):  
Ascorbic Acid ◽  
Acetic Acid ◽  
Vitamin C ◽  
Acid Medium ◽  
Potentiometric Titration ◽  
Potentiometric Determination ◽  
Acetic Acid Medium ◽  
Commercial Products ◽  
Pt Electrodes

Abstract The method of Barakat and co-workers for determination of vitamin C in colored products has been modified for potentiometric use. The procedure is simple and rapid: An aliquot of sample containing 1—3 nig of ascorbic acid is titrated in a 3% acetic acid medium in the presence of KI with previously standardized 0.01% N-bromosuccinimide. The potentiometric titration uses two Pt electrodes with a polarizing current. Results were compared with the USP XVI method and the AOAC 2,6-dichlorophenol indophenol method. Recoveries, obtained from seven commercial products, four of which were vitamin C-enriched, ranged from 96 to 101%. The method also works well on drug mixtures containing ascorbic acid. It is recommended that the method be studied collaboratively.

A New Colorimetric Method for Determination of Residues of Guthion and Ethyl Guthion and Their Oxygen Analogs

1964 ◽  
Vol 47 (5) ◽  
pp. 882-885
Author(s):  
J R W Miles
Keyword(s):  
Acetic Acid ◽  
Hydrochloric Acid ◽  
Absorption Maximum ◽  
Colorimetric Method ◽  
Direct Coupling ◽  
Florisil Column ◽  
Ethylenediamine Dihydrochloride

Abstract A new and rapid colorimetric method of analysis for residues of Guthion and Ethyl Guthion and their oxygen analogs is presented. It is based on the direct coupling of the Guthion series with N-(l-naphthyl) ethylenediamine dihydrochloride in the presence of acetic acid and hydrochloric acid to produce a purple solution with absorption maximum at 556 mμ. The reaction is complete in less than 5 min. and the method is sensitive to 5 μg of Guthion. The oxygen analogs are separated on a Florisil column, the parent insecticides are eluted by chloroform, and the oxygen analogs are then eluted with acetone-chloroform mixture and determined separately. Recoveries from crops ranged from 78 to 97%.

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