New determination of acid-base strength distribution of a common scale on solid surfaces

1975 ◽  
Vol 79 (22) ◽  
pp. 2409-2411 ◽  
Author(s):  
Tohr Yamanaka ◽  
Kozo Tanabe
Keyword(s):  
Strength Distribution ◽  
Solid Surfaces ◽  
Acid Base ◽  
Common Scale ◽  
Base Strength

Enthalpies of Formation of Rare Earth and Actinide(III) Hydroxides; their Acid-Base Relationships and Estimation of their Thermodynamic Properties

1991 ◽  
Vol 257 ◽  
Author(s):  
Lester R. Morss ◽  
Clayton W. Williams
Keyword(s):  
Rare Earth ◽  
Solubility Product ◽  
Enthalpies Of Formation ◽  
Solution Stability ◽  
Acid Base ◽  
Environmental Interactions ◽  
Base Strength ◽  
Cell Volumes

ABSTRACTThis paper reviews the literature on rare earth(III) and actinide(III) hydroxide thermodynamics, in particular the determination of their enthalpies of formation at 25 ºC. The hydroxide unit-cell volumes, lanthanide/actinide ion sizes, and solid-solution stability trends have been correlated with a generalized acid-base strength model for oxides to estimate properties for heterogeneous equilibria that are relevant to nuclear waste modeling and to characterization of potential actinide environmental interactions. Enthalpies of formation and solubility-product constants of actinide(III) hydroxidesare estimated

Assessment of acid–base strength distribution of ion-exchanged montmorillonites through NH3 and CO2-TPD measurements

2006 ◽  
Vol 449 (1-2) ◽  
pp. 27-34 ◽  
Author(s):  
A. Azzouz ◽  
D. Nistor ◽  
D. Miron ◽  
A.V. Ursu ◽  
T. Sajin ◽  
...  
Keyword(s):  
Strength Distribution ◽  
Acid Base ◽  
Base Strength

scholarly journals Characterization of Polymer Surfaces by the Use of Different Wetting Theories Regarding Acid-Base Properties

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Eduard Kraus ◽  
Lukas Orf ◽  
Michael Heilig ◽  
Benjamin Baudrit ◽  
Irina Starostina ◽  
...  
Keyword(s):  
Polymer Surfaces ◽  
Solid Surfaces ◽  
Solid Polymer ◽  
Acid Base ◽  
Polymer Interactions ◽  
Spatial Equation ◽  
Plastic Surfaces ◽  
Base Properties

The existing wetting methods for the determination of acid-base properties on solid surfaces are discussed. Striving for a better understanding of the adhesive polymer interactions in adhesively joined polymers, the methods of Berger and van Oss-Chaudhury-Good were found as the most suitable methods for the investigation of wetting on solid polymer surfaces. Methods of nonlinear systems by Della Volpe and Siboni were adapted and evaluated on plastic surfaces. In the context of these investigations various data of the surface free energy as well as its components have been identified for a number of polymer surfaces by application of spatial equation solutions.

Bestimmung von Oberflächenoxiden auf Rußen durch potentiometrische Direkttitration in nichtwäßrigen Lösungsmitteln / Determination of Surface Oxides on Carbon Blacks by Direct Potentiometric Titration in Non-Aqueous Solvents

1990 ◽  
Vol 45 (6) ◽  
pp. 857-863
Author(s):  
J. O. Besenhard ◽  
H. P. Gansmann ◽  
H. Meyer
Keyword(s):  
Aqueous Media ◽  
Acid Strength ◽  
Strength Distribution ◽  
Fast Method ◽  
Carbon Blacks ◽  
Direct Titration ◽  
Surface Oxides ◽  
Acid And Base ◽  
Base Strength

An attempt is made to quantitatively determine acidic and basic surface oxides on carbon blacks and also to monitor their acid and base strength distribution by direct potentiometric titrations in non-aqueous media.In contrast to direct titration procedures proposed so far, our method allows to distinguish clearly between several types of acidic surface oxides of different acid strength. This is mainly achieved by improvements of the non-aqueous titration media. The total contents of weakly and strongly acidic and also of basic oxides determined by this very fast method is comparable to results obtained by slow and laborious indirect titrations.

Spectrophotometric study of the acid-base and optical properties of the 5-bromo and 5-chloro derivatives of 2-(2-pyridylazo)-5-(diethylamino)phenol (BrPADAP, ClPADAP) and their complexation equilibria with zinc(II) ions

1982 ◽  
Vol 47 (10) ◽  
pp. 2676-2691 ◽  
Author(s):  
Miroslav Macka ◽  
Vlastimil Kubáň
Keyword(s):  
Equilibrium Constants ◽  
Spectrophotometric Study ◽  
Graphical Analysis ◽  
Alkaline Media ◽  
Acid Base ◽  
Ethanol Medium ◽  
Triton X ◽  
Mixed Water ◽  
Derivatives Of

The optical and acid-base characteristics of BrPADAP and ClPADAP were studied in mixed water-ethanol and water-DMF media and in 10% ethanol medium in the presence of cationic, anionic and nonionic tensides. The composition, optical characteristics, molar absorption coefficients and equilibrium constants of the ML and ML2 complexes with zinc(II) ions were found by graphical analysis and numerical interpretation of the absorbance curves by the modified SQUAD-G program. Optimal conditions were found for the spectrophotometric determination of Zn(II) in the presence of 0.1% Triton X-100 or 1% Brij 35 in alkaline media with pH = 6.5-10. BrPADAP and ClPADAP are the most sensitive reagents (ε = 1.3-1.6 . 105 mmol-1 cm2 at 557 and 560 nm, respectively) for the determination of zinc with high colour contrast of the reaction (Δλ = 104 nm) and selectivity similar to that for the other N-heterocyclic azodyes (PAN, PAR, etc.).

Bicarbonate and CO2 transport across the skin of the leopard frog, Rana pipiens: effect of PGF2alpha

1997 ◽  
Vol 272 (2) ◽  
pp. R640-R647 ◽  
Author(s):  
O. A. Candia ◽  
T. Yorio
Keyword(s):  
Methodological Approach ◽  
Transport Processes ◽  
Leopard Frog ◽  
Bicarbonate Transport ◽  
Amphibian Skin ◽  
Acid Base ◽  
Reliable Determination ◽  
Net Flux ◽  
Unidirectional Fluxes

The amphibian skin represents an important organ for osmoregulation and, like the mammalian kidney, maintains acid-base balance by secreting protons or base. However, the lack of a reliable and accurate method to measure the contribution of unidirectional fluxes of HCO3- ions to this mechanism has been an obstacle for the determination of the role of bicarbonate in epithelial acid-base homeostasis. Recently, one of us developed a method that allows for the reliable determination of transepithelial fluxes of bicarbonate, and this method was applied to determine unidirectional fluxes of (14)CO2 and H(14)CO3 under a variety of conditions. We report that the combined CO2 and HCO3- mucosal-to-serosal flux under 5% CO2 was 40% larger than the opposing flux, giving a net flux in the mucosal-to-serosal direction. This net flux was inhibited by acetazolamide. In CO2-free conditions, there was no detectable net flux; however, acetazolamide and PGF(2alpha) attenuated the mucosal-to-serosal flux and established an apparent secretion of HCO3-. A model is presented that depicts twelve vectors or components to the CO2 plus HCO3- fluxes in the frog skin. This model can accurately reproduce the experimental values measured from unidirectional fluxes of CO2 and HCO3- under a variety of conditions and can explain the effects of PGF(2alpha) on unidirectional 14C-labeled fluxes as a consequence of inhibition of H+ secretion to the apical bath, similar to what was previously suggested by our laboratory using a different methodological approach. The present method, utilizing radiolabeled HCO3-, may be useful as a means to evaluate the mechanism of action of hormones and drugs that may regulate acid-base homeostasis by altering proton and bicarbonate transport processes.

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