A Calorimetric Determination of the Energy Required to Produce an Ion Pair in Air for Cobalt-60 Gamma-Rays

1956 ◽  
Vol 5 (6) ◽  
pp. 613 ◽  
Author(s):  
J. P. Bernier ◽  
L. D. Skarsgard ◽  
D. V. Cormack ◽  
H. E. Johns
Keyword(s):  
Gamma Rays ◽  
Ion Pair ◽  
Calorimetric Determination

A determination of W and G(H2) values for methyl fluoride and fluoroform

1970 ◽  
Vol 48 (12) ◽  
pp. 1812-1814 ◽  
Author(s):  
Mario Saca ◽  
R. A. Lee
Keyword(s):  
Gamma Rays ◽  
Ionization Chamber ◽  
Parallel Plate ◽  
Ion Pair ◽  
Methyl Fluoride ◽  
Gray Theory ◽  
Plate Type

Methyl fluoride and fluoroform have been irradiated with gamma rays from a 1200-Ci 60Co source. Ionization currents were measured using a Pyrex parallel-plate-type ionization chamber. W values of 27.2 and 28.0 eV were determined for the two gases, CH3F and CHF3, respectively. The method employed was a comparative one, making use of the Bragg–Gray theory of cavity ionization. G(H2) yields of 4.20 and 1.25 for CH3F and CHF3, respectively, were then calculated from the above W values and the measured ion-pair yields for hydrogen. The formation of hydrogen is probably due to the fact that the C—H bonds in these compounds are weaker than the C—F bonds.

Extractive Spectrophotometric Method for the Determination of Glibenclamide by Ion-Pair Complex in Pure Form and Pharmaceutical Formulation

2019 ◽  
Vol 9 (o3) ◽  
Author(s):  
RUAA MUAYAD MAHMOOD ◽  
HAMSA MUNAM YASSEN ◽  
SAMAR , NAJWA ISSAC ABDULLA AHMED DARWEESH ◽  
NAJWA ISSAC ABDULLA
Keyword(s):  
Spectrophotometric Method ◽  
Molar Absorptivity ◽  
Ion Pair ◽  
Pharmaceutical Formulation ◽  
Ratio Method ◽  
Colored Complex ◽  
Colored Product ◽  
Method Of Continuous Variation ◽  
Job's Method

Simple, rapid and sensitive extractive spectrophotometric method is presented for the determination of glibenclamide (Glb) based on the formation of ion-pair complex between the Glb and anionic dye, methyl orange (MO) at pH 4. The yellow colored complex formed was quantitatively extracted into dichloromethane and measured at 426 nm. The colored product obeyed Beer’s law in the concentration range of (0.5-40) μg.ml-1. The value of molar absorptivity obtained from Beer’s data was found to be 31122 L.mol-1.cm-1, Sandell’s sensitivity value was calculated to be 0.0159 μg.cm-2, while the limits of detection (LOD) and quantification (LOQ) were found to be 0.1086 and 0.3292 μg.ml-1, respectively. The stoichiometry of the complex created between the Glb and MO was 1:1 as determined via Job’s method of continuous variation and mole ratio method. The method was successfully applied for the analysis of pharmaceutical formulation.

Reversed-phase ion-pair chromatography in determination of sinomenine contents in Sinomenium acutum

2010 ◽  
Vol 30 (2) ◽  
pp. 193-195
Author(s):  
Hui WANG ◽  
Qing YE ◽  
Liang ZHAO ◽  
Wen-jun TIAN ◽  
Guo-qing ZHANG
Keyword(s):  
Reversed Phase ◽  
Ion Pair ◽  
Ion Pair Chromatography ◽  
Sinomenium Acutum

Determination of Organic Bases by Ion-Pair Extraction Polarography Using Orange II as Counter Ion

1992 ◽  
Vol 57 (11) ◽  
pp. 2272-2278 ◽  
Author(s):  
Václav Koula ◽  
Daria Kučová ◽  
Jiří Gasparič
Keyword(s):  
Model Compound ◽  
Differential Pulse ◽  
Ion Pair ◽  
Differential Pulse Polarography ◽  
Orange Ii ◽  
Organic Bases ◽  
Counter Ion ◽  
Pulse Polarography ◽  
Ammonium Compounds

The combination of ion-pair extraction and differential pulse polarography is shown to be a method suitable for the determination of 10-7 mol l-1 concentrations of organic bases of quaternary ammonium compounds. Orange II (4-[2-hydroxy-1-naphtyl]azobenzenesulfonic acid) was found to be an appropriate polarographically active counter-ion. The proposed method was used for the determination of tetrapentylammonium bromide (as model compound), Septonex ([1-(ethoxycarbonyl)-pentadecyl]trimethylammonium bromide) and codeine.

Determination of biogenic amines in tomato by ion-pair chromatography coupled to an amine-selective potentiometric detector

2021 ◽  
pp. 138134
Author(s):  
Renato L. Gil ◽  
Célia G. Amorim ◽  
Maria C.B.S.M. Montenegro ◽  
Alberto N. Araújo
Keyword(s):  
Biogenic Amines ◽  
Ion Pair ◽  
Ion Pair Chromatography
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