A new semiempirical kinetic method for the determination of ion exchange constants for counterions of cationic micelles: Study of the rate of pH-independent hydrolysis of phthalimide as the kinetic probe

2010 ◽  
Vol 43 (1) ◽  
pp. 9-20 ◽  
Author(s):  
M. Niyaz Khan ◽  
Sharmilah Sinasamy
Keyword(s):  
Ion Exchange ◽  
Kinetic Method ◽  
Cationic Micelles ◽  
Exchange Constants ◽  
Hydrolysis Of

Determination of the Ion Exchange Constants of Four Aromatic Organic Anions Competing for a Cationic Micellar Interface

Langmuir ◽  
1996 ◽  
Vol 12 (7) ◽  
pp. 1744-1754 ◽  
Author(s):  
Steven J. Bachofer ◽  
Ursula Simonis
Keyword(s):  
Ion Exchange ◽  
Organic Anions ◽  
Exchange Constants

Automated Chemical Determination of Methionine

1974 ◽  
Vol 57 (3) ◽  
pp. 682-688
Author(s):  
Charles W Gehrke ◽  
Terry E Neuner
Keyword(s):  
Amino Acid ◽  
Standard Deviation ◽  
Ion Exchange ◽  
Automated System ◽  
Automated Method ◽  
Relative Standard ◽  
Chemical Determination ◽  
Sample Recovery ◽  
Hydrolysis Of

Abstract A rapid, accurate, and precise spectrophotometry method, based on the nitroprussidemethionine color reaction, has been developed for the determination of methionine in soybeans, mungbeans, and corn. Amino acid interference was eliminated by partial enzymatic hydrolysis of samples for 4 hr at 50 °C with papain; the samples were analyzed by an automated system. Precision and accuracy were determined by repeated independent analyses of 13 samples of corn, mungbeans, and soybeans; the data were compared to independent classical ion exchange amino acid results. The range for each set of samples varied from 0.02 to 0.04 w/w% methionine. The per cent recovery for 12 of the 13 samples compared to those from ion exchange ranged from 95.2 to 107.1% with an average of 100.2%. The standard deviation varied from 0.01 to 0.02, and the per cent relative standard deviation from 11.8% for a 0.16 w/w% sample to 2.5% for a 0.42 w/w% sample. Recovery of added methionine from corn samples ranged from 92.7 to 102.0% (96.8% average) ; from soybeans 95.0 to 112.0% (101.9% average); and from mungbeans 91.3 to 102.0% (95.8% average). A reliable automated method has been developed which is applicable to different types of biological substances; 20 samples/hr can be analyzed.

Determination of ion exchange constants for pairs of metal ions to lignocellulosic materials by column chromatography

Holzforschung ◽  
2014 ◽  
Vol 68 (8) ◽  
pp. 875-880
Author(s):  
Pingping Su ◽  
Kim Granholm ◽  
Leo Harju ◽  
Ari Ivaska
Keyword(s):  
Ion Exchange ◽  
Metal Ions ◽  
Column Chromatography ◽  
Strong Acid ◽  
Transition Metal Ions ◽  
Wood Pulp ◽  
Column Method ◽  
Exchange Constants ◽  
Materials Used

Abstract A method based on column chromatography has been developed for determination of ion exchange (IE) constants for pairs of metal ions for different types of wood, pulp, and bark samples. Bark was found to have higher selectivity than wood and pulp for the metal ions studied. Of the 14 different metal ions studied, the toxic transition metal ions Pb, Cu, and Cd were most strongly bound to all the materials used in this work. The validity of the column method was tested by means of different mixtures of metal ions as the loading solution. The IE constants obtained by the column method showed a good agreement with those obtained by the batch method reported earlier by our group. The IE constants were also determined for synthetic cation exchanger (CE) based on weak and strong acid groups. The IE constants of most pairs of metal ions are highest for the weakly acidic CE followed by bark, wood, pulp, and strongly acidic CE.

Hydrolysis of Ferrous Ions : a Kinetic Method for the Determination of the Fe(II) Species

Nature ◽  
1965 ◽  
Vol 205 (4972) ◽  
pp. 690-692 ◽  
Author(s):  
C. F. WELLS ◽  
M. A. SALAM
Keyword(s):  
Kinetic Method ◽  
Ferrous Ions ◽  
Hydrolysis Of

scholarly journals Acid-catalyzed Hydrolysis of Bridged Bi- and Tricyclic Compounds. XXIV. A Kinetic Method for Determination of Protonation Site in Hydration of 5-Substituted 2-Norbornenes.

1985 ◽  
Vol 39a ◽  
pp. 109-115 ◽  
Author(s):  
Martti Lajunen ◽  
Risto Hiukka ◽  
Jorma Arpalahti ◽  
Eeva Ottoila ◽  
Antti Vesala
Keyword(s):  
Kinetic Method ◽  
Protonation Site ◽  
Tricyclic Compounds ◽  
Acid Catalyzed ◽  
Hydrolysis Of
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