Determination of sulfuric acid first dissociation constants to 400°C and 32MPa by potentiometric pH measurements

2004 ◽  
Vol 31 (3) ◽  
pp. 295-299 ◽  
Author(s):  
Kiwamu Sue ◽  
Munehiro Uchida ◽  
Tadafumi Adschiri ◽  
Kunio Arai
Keyword(s):  
Sulfuric Acid ◽  
Dissociation Constants ◽  
Ph Measurements

scholarly journals DETERMINATION OF ALKALINITY AND DISSOCIATION CONSTANTS OF HIGH SALINITY WATERS: USE OF F5BC TITRATION FUNCTION

2018 ◽  
Vol 35 (2) ◽  
pp. 79
Author(s):  
Bernadete F. Cavalcanti ◽  
Lourdes Cristina Lucena Agostinho ◽  
Luciano Nascimento
Keyword(s):  
Natural Waters ◽  
Dissociation Constants ◽  
A Priori ◽  
Linear Regression Analysis ◽  
Liquid Junction ◽  
Carbonate System ◽  
Ph Measurements ◽  
Apparent Dissociation Constant ◽  
Junction Potential

Measurements of parameters expressed in terms of carbonic species such as Alkalinity and Acidity of saline waters do not analyze the influence of external parameters to the titration such as Total free and associated Carbonic Species Concentration, activity coefficient, ion pairing formation and Residual Liquid Junction Potential in pH measurements. This paper shows the development of F5BC titration function based on the titrations developed by Gran (1952) for the carbonate system of natural waters. For practical use, samples of saline watersfrom Pocinhos reservoir in Paraiba were submitted to titration and linear regression analysis. Results showed that F5BC involves F1x and F2x Gran functions determination, respectively, for Alkalinity and Acidity calculations without knowing “a priori” the endpoint of the titration. F5BC also allows the determination of the First and Second Apparent Dissociation Constant of the carbonate system of saline and high ionic strength waters.

Determination of Dissociation Constants of Hexanoic, Heptanoic, and Benzoic Acids to 673 K and 30 MPa by Potentiometric pH Measurements

2010 ◽  
Vol 55 (11) ◽  
pp. 4823-4826 ◽  
Author(s):  
Kiwamu Sue ◽  
Teruaki Morita ◽  
Kumiko Totsuka ◽  
Yoshihiro Takebayashi ◽  
Satoshi Yoda ◽  
...  
Keyword(s):  
Dissociation Constants ◽  
Benzoic Acids ◽  
Ph Measurements

Determination of acidic dissociation constants of L-phenylalanyl-glycine and L-alanyl-L-alanine in water using ab initio methods

2014 ◽  
Vol 2 (42) ◽  
pp. 263-263
Author(s):  
Farhoush Kiani ◽  
Mahmoud Tajbakhsh ◽  
Fereydoon Ashrafi ◽  
Nesa Shafiei ◽  
Azar Bahadori ◽  
...  
Keyword(s):  
Ab Initio ◽  
Dissociation Constants ◽  
Ab Initio Methods ◽  
Acidic Dissociation

Improved Method for the Determination of Ethylenebisdithiocarbamate Residues in Plants, Fruits, and Vegetables

1967 ◽  
Vol 50 (5) ◽  
pp. 1102-1108
Author(s):  
Charles F Gordon ◽  
Richard J Schuckert ◽  
William E Bornak
Keyword(s):  
Sulfuric Acid ◽  
Fruits And Vegetables ◽  
Analytical Procedure ◽  
Improved Method ◽  
Modified Method ◽  
Fungicide Residues ◽  
Crop Types ◽  
Large Representative

Abstract A modified method for the determination of dithiocarbamate fungicide residues on crops is presented. A large representative subsample of the frozen crop is blended in ice-cold deaerated water and an aliquot of the homogenate is added to the analytical apparatus containing hot 5 0% sulfuric acid. Dithiocarbamates are decomposed to evolve CS2 which is removed by a continuous gentle air-sweep from the digestion flask. Variations in technique allow the analysis of dithiocarbamate fungicide residues in several ranges, 1-10, 10-200, and 200-1000 /ig maneb. Recoveries from a wide variety of crops averaged 70 to 103%. Certain crop types present low recoveries and/or high apparent control values, but modifications in the analytical procedure are successful in solving these problems.

scholarly journals Circular dichroism determination of class I MHC-peptide equilibrium dissociation constants

1997 ◽  
Vol 6 (8) ◽  
pp. 1771-1773 ◽  
Author(s):  
Chantal S. Morgan ◽  
James M. Holton ◽  
Barry D. Olafson ◽  
Pamela J. Bjorkman ◽  
Stephen L. Mayo
Keyword(s):  
Circular Dichroism ◽  
Dissociation Constants ◽  
Class I ◽  
Class I Mhc ◽  
Equilibrium Dissociation Constants ◽  
Equilibrium Dissociation ◽  
Circular Dichroïsm
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