POLAROGRAPHIC DETERMINATION OF THE DISSOCIATION CONSTANT OF THE SULPHYDRYL GROUP AND DIFFUSION COEFFICIENT MEASUREMENTS OF THIOMALIC ACID

1961 ◽  
Vol 39 (11) ◽  
pp. 2236-2239 ◽  
Author(s):  
R. C. Kapoor ◽  
O. P. Agrawal ◽  
T. D. Seth
Keyword(s):  
Diffusion Coefficients ◽  
Polarographic Study ◽  
Standard Potential ◽  
Charged Species ◽  
Half Wave ◽  
Ph Range ◽  
And Diffusion ◽  
Respective Species ◽  
Made In

Polarographic study of thiomalic acid has been made in the pH range 1–12.5 using Britton–Robinson buffer at 30°. The half-wave potential [Formula: see text] values have been used to determine the pK3 (SH) value of the acid (pK3 = 10.55).The diffusion current obtained in these experiments has been utilized to calculate the diffusion coefficients of the different charged species of thiomalic acid. The values thus obtained for the respective species are H3A = 1.20 × 10−5 cm2/sec; H2A− = 1.16 × 10−5 cm2/sec; HA−− = 1.08 × 10−5 cm2/sec; and A−−− = 7.67 × 10−6 cm2/sec.The standard potential of the reaction[Formula: see text]has been calculated as +0.266 volt vs. N.H.E.

Determination of mobility and diffusion coefficients of Ar+ and Ar2+ ions in argon gas

2020 ◽  
Vol 23 (2) ◽  
pp. 143-151
Author(s):  
Jamiyanaa Dashdorj ◽  
William C. Pfalzgraff ◽  
Aaron Trout ◽  
Delenn Fingerlow ◽  
Michelle Cordier ◽  
...  
Keyword(s):  
Diffusion Coefficients ◽  
Argon Gas ◽  
And Diffusion

scholarly journals Determination of Diffusion Coefficients of Selected Long Chain Hydrocarbons using Reversed- Flow Gas Chromatographic Technique

2011 ◽  
Vol 8 (4) ◽  
pp. 1916-1924 ◽  
Author(s):  
Khalisanni Khalid ◽  
Rashid Atta Khan ◽  
Sharifuddin Mohd Zain
Keyword(s):  
Gas Chromatography ◽  
Diffusion Coefficients ◽  
Elution Curve ◽  
Mathematical Expression ◽  
Chromatographic Technique ◽  
Reversed Flow ◽  
Future Studies ◽  
And Diffusion ◽  
Long Chain

The reversed-flow gas chromatography (RF-GC) technique was used to study the evaporation rate and estimating the diffusion coefficient of samples. The RF-GC system comprises of six-port valve, sampling and diffusion column, detector and modified commercial gas chromatography machine. Selected long chain of hydrocarbons (99.99% purity) was used as samples. The solute (stationary phase) were carried out by carrier gas (mobile phase) to the detector. The data obtained from the RF-GC analysis were analysed by deriving the elution curve of the sample peaks using mathematical expression to find the diffusion coefficients values of respective liquids. The values obtained were compared with theoretical values to ensure the accuracy of readings. The interesting findings of the research showed the theoretical values of equilibrium at liquid-gas interphase lead to profound an agreement with the experimental evidence, which contributes for the references of future studies.

Site Preference and Diffusion in Ni3Al Alloyed with Ir, Ta or Re at 1200°C

2010 ◽  
Vol 297-301 ◽  
pp. 1322-1327 ◽  
Author(s):  
N. Garimella ◽  
H.J. Choi ◽  
Yong Ho Sohn
Keyword(s):  
Diffusion Coefficients ◽  
Tracer Diffusion ◽  
Site Preference ◽  
Solid Diffusion ◽  
Ordered Intermetallic ◽  
Ternary Alloying ◽  
Tracer Diffusion Coefficients ◽  
Interdiffusion Coefficients ◽  
And Diffusion

Diffusion in L12-Ni3Al with ternary alloying additions of Ir, Ta and Re was investigated at 1200°C using solid-to-solid diffusion couples, and examined with respect to site preference in ordered intermetallic compound. In addition to determination of average ternary interdiffusion coefficients [1-3], average effective interdiffusion coefficients were determined directly from the experimental concentration profiles. Ni has the largest magnitude of average effective interdiffusion coefficient, followed by Al, Ir, Re and Ta. The average effective interdiffusion coefficients for Ir, Re and Ta are much smaller than those for Ni and Al. Tracer diffusion coefficients determined by extrapolation technique, and available literature also followed the same trend. The relative tendency of Ni, Al, Ir, Re and Ta to occupy the -Ni and -Al sites are correlated to these diffusion coefficients, with due consideration for diffusion mechanisms and coordination of atoms.

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