Modeling the Mean Ionic Activity Coefficient of Inorganic Salts in Complex Polymer/Water Mixtures. Application of the Segment-eNRTL Model

2008 ◽  
Vol 47 (1) ◽  
pp. 231-242 ◽  
Author(s):  
Stephan Machefer ◽  
Klaus Schnitzlein
Keyword(s):  
Activity Coefficient ◽  
Inorganic Salts ◽  
Ionic Activity ◽  
The Mean ◽  
Complex Polymer

Potentiostatic study of ferrous–ferric kinetics at bright gold and platinum electrodes

1969 ◽  
Vol 47 (10) ◽  
pp. 1661-1666 ◽  
Author(s):  
Sidney Barnartt
Keyword(s):  
Activity Coefficient ◽  
Reaction Kinetics ◽  
Current Density ◽  
Sulfate Solution ◽  
Platinum Electrodes ◽  
Ionic Activity ◽  
Potential Control ◽  
Sulfate Solutions ◽  
Order Of Magnitude ◽  
The Mean

Ferrous–ferric reaction kinetics on gold in chloride and sulfate solutions, and on platinum in a sulfate solution, were studied potentiostatically. The data illustrate the importance of precise potential control and of automatic ohmic compensation. The standard exchange current density is 0.38/f A cm−2 (where f is the mean ionic activity coefficient) on platinum; it is an order of magnitude larger on gold.

Degrees of Dissociation and Hydration Numbers of Twenty Six Strong Electrolytes in Aqueous Solutions at 25 °C

1992 ◽  
Vol 57 (11) ◽  
pp. 2209-2214 ◽  
Author(s):  
Rajalakshmi Heyrovská
Keyword(s):  
Activity Coefficient ◽  
Aqueous Solutions ◽  
Osmotic Coefficients ◽  
Hydration Numbers ◽  
Ionic Activity ◽  
Strong Electrolytes ◽  
The Mean ◽  
First Time ◽  
Degrees Of Dissociation

This paper brings further results on the degrees of dissociation (α) and hydration numbers (nh) of strong electrolytes in aqueous solutions at 25 °C, evaluated for the first time from osmotic coefficients (ϕ). Presented here are also the equations for the non-ideality parameters, ϕ and γ± (the mean molal ionic activity coefficient), in terms of α and nh.

scholarly journals Structure and thermodynamics in the linear modified Poisson-Boltzmann theories in restricted primitive model electrolytes

2021 ◽  
Vol 24 (2) ◽  
pp. 23801
Author(s):  
L. B. Bhuiyan
Keyword(s):  
Activity Coefficient ◽  
Distribution Functions ◽  
Spherical Approximation ◽  
Mean Spherical Approximation ◽  
Primitive Model ◽  
Restricted Primitive Model ◽  
Mean Activity Coefficient ◽  
Poisson Boltzmann ◽  
Electrical Part ◽  
The Mean

Structure and thermodynamics in restricted primitive model electrolytes are examined using three recently developed versions of a linear form of the modified Poisson-Boltzmann equation. Analytical expressions for the osmotic coefficient and the electrical part of the mean activity coefficient are obtained and the results for the osmotic and the mean activity coefficients are compared with that from the more established mean spherical approximation, symmetric Poisson-Boltzmann, modified Poisson-Boltzmann theories, and available Monte Carlo simulation results. The linear theories predict the thermodynamics to a remarkable degree of accuracy relative to the simulations and are consistent with the mean spherical approximation and modified Poisson-Boltzmann results. The predicted structure in the form of the radial distribution functions and the mean electrostatic potential also compare well with the corresponding results from the formal theories. The excess internal energy and the electrical part of the mean activity coefficient are shown to be identical analytically for the mean spherical approximation and the linear modified Poisson-Boltzmann theories.

Inorganic Bromide in Higher Fungi

1984 ◽  
Vol 39 (9-10) ◽  
pp. 863-866 ◽  
Author(s):  
T. Stijve
Keyword(s):  
Trace Element ◽  
Dry Weight ◽  
Mean Value ◽  
Inorganic Salts ◽  
Chromatographic Methods ◽  
The Mean ◽  
High Concentrations

Abstract A total of 138 samples of higher fungi, representing 35 species (15 belonging to the genus Amanita), were analysed for the trace element bromine using spectrophotometric and gas chromatographic methods. High concentrations of bromine, up to 100 mg/kg on dry weight, were encountered in Amanitaceae, especially in members of the subsections Phalloideae and Eu-Amanita, whereas in other fungi the mean value for this element was only 3,3 m g/kg. Some bromine-accumulating Amanitas also contained unusually high chlorine levels. Am axi­mum concentration of 3 percent on dry weight was measured in A. phalloides. It could be demonstrated that most, if not all of bromine and chlorine was present in the fungi as ionisable inorganic salts. Two organochlorine metabolites, previously reported in some mushrooms, were absent in A. phalloides and A. muscaria.

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