Buffers for the Physiological pH Range: Acidic Dissociation Constants of Zwitterionic Compounds in Various Hydroorganic Media

2005 ◽  
Vol 95 (1-2) ◽  
pp. 105-109 ◽  
Author(s):  
Mohamed Taha
Keyword(s):  
Dissociation Constants ◽  
Acidic Dissociation ◽  
Ph Range

Buffers for the Physiological pH Range:  Acidic Dissociation Constants of Zwitterionic Compounds (ACES and CHES) in Water from 5 to 55 °C

1997 ◽  
Vol 42 (1) ◽  
pp. 41-44 ◽  
Author(s):  
Rabindra N. Roy ◽  
Jennifer Bice ◽  
Jason Greer ◽  
Julie A. Carlsten ◽  
Julie Smithson ◽  
...  
Keyword(s):  
Dissociation Constants ◽  
Acidic Dissociation ◽  
Ph Range

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

scholarly journals A Theoretical Study on Determination of Acidic Dissociation Constants of Penicillamine and Captopril in Water

2014 ◽  
Vol 4 (1) ◽  
pp. 018-032 ◽  
Author(s):  
Kiani Farhoush ◽  
◽  
Taherinasab R ◽  
Tahermansouri Hasan ◽  
Koohyar Fardad ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Dissociation Constants ◽  
Acidic Dissociation

Chemical phosphorus removal model based on equilibrium chemistry

2005 ◽  
Vol 52 (10-11) ◽  
pp. 549-555 ◽  
Author(s):  
I. Takács ◽  
S. Murthy ◽  
P.M. Fairlamb
Keyword(s):  
Phosphorus Removal ◽  
Dissociation Constants ◽  
Chemical Precipitation ◽  
Weak Acid ◽  
Chemical Mechanisms ◽  
Model Based ◽  
Precipitation Model ◽  
Physico Chemical ◽  
Ph Range ◽  
Biological Methods

Regulations in many regions of the world require total phosphorus (TP) levels lower than 0.10mgP/L (100μgP/L) in effluents, resulting in the need to achieve very low ortho-phosphate (OP) concentrations. Chemical precipitation is a widely used technology for controlling effluent OP discharge, either on its own or supplementing biological methods. The various chemical and physico-chemical mechanisms that result in extremely low residual OP levels are complex and depend on pH. In practice, engineering calculations frequently use an empirical precipitation model. This model requires pH as input and predicts the lowest achievable OP residual of 35μgP/L at a narrow optimum pH of 6.9 – 7.0, when an excess of ferric is added. The model has been combined with a biokinetic and weak acid/base chemistry based pH model, to allow accurate prediction of pH, OP residuals and chemical sludge production. Analysis of effluent data from the Blue Plains plant shows that residuals as low as 10μgP/L OP can be achieved regularly, over a wider pH range. The precipitation model was recalibrated to match the newly available data. Subsequently it was compared with a new, mechanistic precipitation model based on solubility and dissociation constants for actual chemical compounds. The need for more accurate measurement of extremely low OP concentrations and considering the role of organics, adsorption and coagulation in chemical phosphorus removal is demonstrated.

Studies of reagents for spectrophotometric measurement of ionic magnesium

1977 ◽  
Vol 55 (22) ◽  
pp. 3909-3914 ◽  
Author(s):  
Dennis G. McMinn ◽  
Byron Kratochvil
Keyword(s):  
Complex Formation ◽  
Dissociation Constants ◽  
Formation Constants ◽  
Acid Dissociation ◽  
Disulfonic Acid ◽  
Acid Dissociation Constants ◽  
Spectrophotometric Measurement ◽  
Ph Range ◽  
Metal Ligand ◽  
The Ideal

Four mono-azo aryl dyes having the o-carboxy-o′-hydroxy functionality were investigated as reagents for the measurement of ionic Mg2+ in solutions containing complexing ligands. 2-(2′-Carboxyl-1′-benzeneazo)-1,8-dihydroxynaphthalene-3,6-disulfonic acid came closest to the ideal of having absorbance unaffected by pH over the pH range of interest and of differentiating between Ca2+ and Mg2+ complex formation. Ligand acid dissociation constants and formation constants for the metal–ligand complexes were measured.

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