Reactivity of the Mn(III) and Mn(IV) Intermediates in the Permanganate/Oxalic Acid/Sulfuric Acid Reaction: Kinetic Determination of the Reducing Species

1994 ◽  
Vol 98 (50) ◽  
pp. 13294-13299 ◽  
Author(s):  
V. Pimienta ◽  
D. Lavabre ◽  
G. Levy ◽  
J. C. Micheau
Keyword(s):  
Sulfuric Acid ◽  
Oxalic Acid ◽  
Reaction Kinetic ◽  
Kinetic Determination ◽  
Acid Reaction

Analytical applications of the o-dianisidine-persulfate reaction: Kinetic determination of silver and cobalt

1985 ◽  
Vol 32 (2) ◽  
pp. 242-248 ◽  
Author(s):  
C. Sánchez-Pedreño ◽  
M.Hernández Córdoba ◽  
P.Viñas López-Pelegrín
Keyword(s):  
Reaction Kinetic ◽  
Kinetic Determination ◽  
Analytical Applications

scholarly journals Reaction Kinetic Determination of the Hydroxide-Alkoxide Equilibrium in Anion Exchangers.

1958 ◽  
Vol 12 ◽  
pp. 141-142
Author(s):  
Eero Sjöström ◽  
Lalli Nykänen ◽  
Anders Norrby ◽  
Lars Svennerholm ◽  
L. Ernster ◽  
...  
Keyword(s):  
Reaction Kinetic ◽  
Anion Exchangers ◽  
Kinetic Determination

Kinetics of the Cholesterol-Sulfuric Acid Reaction: A Fast Kinetic Method for Serum Cholesterol

1973 ◽  
Vol 19 (10) ◽  
pp. 1128-1134 ◽  
Author(s):  
Thomas E Hewitt ◽  
Harry L Pardue
Keyword(s):  
Sulfuric Acid ◽  
Serum Cholesterol ◽  
Kinetic Method ◽  
Cholesterol Concentration ◽  
Optimal Conditions ◽  
Experimental Conditions ◽  
Kinetic Determination ◽  
Acid Reaction ◽  
Fast Kinetic ◽  
Kinetics Of

Abstract We studied the kinetics of the reaction between cholesterol and sulfuric acid in acetic acid-acetic anhydride medium. Results have been used to establish near-optimal conditions for the fast kinetic determination of cholesterol in serum. The reaction rate measured during the first 20 s of the reaction is proportional to cholesterol concentration. There is good agreement (<2% deviation) between pseudo-first-order rate constants for cholesterol standards and sera. Recoveries of standard cholesterol added to sera range from 99% to 104% (average, 100.7%). Values for serum cholesterol by this kinetic determination tend to be somewhat lower than equilibrium values reported by local hospital laboratories. Whether bilirubin interferes depends on reaction conditions; under optimal conditions, each milligram of bilirubin is kinetically equivalent to about 1 mg of apparent cholesterol. Kinetic data are included to show how results are degraded by operating under nonoptimal conditions, and considerations involved in changing experimental conditions are discussed.

Determination of 3 β-hydroxysterols by the cysteine-sulfuric acid reaction

1972 ◽  
Vol 6 (3) ◽  
pp. 267-273
Author(s):  
R.A. McAllister ◽  
J.N. Crook ◽  
D.C. Smith ◽  
C. Mackay
Keyword(s):  
Sulfuric Acid ◽  
Acid Reaction

AN IMPROVED PREPARATIVE METHOD FOR D-ERYTHROSE 4-PHOSPHATE

1966 ◽  
Vol 44 (6) ◽  
pp. 663-669 ◽  
Author(s):  
A. S. Sieben ◽  
A. S. Perlin ◽  
F. J. Simpson
Keyword(s):  
Sulfuric Acid ◽  
Quantitative Determination ◽  
Preparative Method ◽  
Lead Tetraacetate ◽  
Barium Salt ◽  
Acid Reaction ◽  
Sugar Phosphates ◽  
Phenol Sulfuric Acid ◽  
Dowex 1

The oxidation of 1 mmole of D-glucose 6-phosphate with 1.7 mmoles of lead tetraacetate admixed with 1.8 mmoles of sulfuric acid yields a preparation containing 0.77 mmole of D-erythrose 4-phosphate and 0.20 mmole of unoxidized glucose 6-phosphate. The D-erythrose 4-phosphate is separated from the D-glucose 6-phosphate by chromatography on Dowex 1-formate, and recovered as the barium salt of the hydrazone in 50% yield. Evidence is presented that erythrose 4-phosphate may exist in monomeric and dimeric forms. Glucose 6-phosphate and erythrose 4-phosphate produce different colors in the phenol – sulfuric acid reaction. This can be used for the qualitative identification and quantitative determination of these sugar phosphates.

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