Adsorption of chlorate and bromate ions on mercury electrodes from constant ionic strength solutions

1988 ◽  
Vol 85 ◽  
pp. 523-527
Author(s):  
M.M. Zuleika ◽  
Palhares SILVA ◽  
Ernesto Rafael GONZALEZ ◽  
Luis Alberto AVACA ◽  
Artur de Jesus MOTHEO
Keyword(s):  
Ionic Strength ◽  
Constant Ionic Strength ◽  
Mercury Electrodes

The influence of ionic strength on the adsorption of azide ions on mercury electrodes

1986 ◽  
Vol 64 (2) ◽  
pp. 413-418 ◽  
Author(s):  
Artur J. Motheo ◽  
Ernesto R. Gonzalez ◽  
Luis A. Avaca
Keyword(s):  
Ionic Strength ◽  
Adsorption Isotherm ◽  
Double Layer ◽  
Activity Coefficients ◽  
Constant Ionic Strength ◽  
Electrostatic Model ◽  
Solution Composition ◽  
Mercury Electrodes

The adsorption of azide ions on mercury electrodes has been studied from constant ionic strength solutions of composition χ M NaN3 + (μ–χ) M NaF with μ = 0.25 and 0.5. Double layer parameters were obtained by taking into account the change in activity coefficients with solution composition. The results were analyzed together with those reported previously for μ = 0.95, recalculated to take into account the change in activity coefficients. The influence of the ionic strength on the amount adsorbed, the properties of the inner layer, and the parameters of an adsorption isotherm for azide anions are discussed in terms of the electrostatic model of the double layer.

Kinetics and Mechanism of Hexachloroiridate(IV) Oxidation of Arsenic(III) in Acidic Perchlorate Solutions

1992 ◽  
Vol 57 (7) ◽  
pp. 1451-1458 ◽  
Author(s):  
Refat M. Hassan
Keyword(s):  
Ionic Strength ◽  
Fractional Order ◽  
Activation Parameters ◽  
Order Reaction ◽  
First Order Reaction ◽  
Intermediate Complex ◽  
Constant Ionic Strength ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Kinetics Of

The kinetics of oxidation of arsenic(III) by hexachloroiridate(IV) at lower acid concentrations and at constant ionic strength of 1.0 mol dm-3 have been investigated spectrophotometrically. A first-order reaction in [IrCl62-] and fractional order with respect to arsenic(III) have been observed. A kinetic evidence for the formation of an intermediate complex between the hydrolyzed arsenic(III) species and the oxidant was presented. The results showed that decreasing the [H+] is accompanied by an appreciable acceleration of the rate of oxidation. The activation parameters have been evaluated and a mechanism consistent with the kinetic results was suggested.

Speciation of protactinium(V) at tracer scale

2009 ◽  
Vol 97 (7) ◽  
Author(s):  
Claire Le Naour ◽  
M. V. Di Giandomenico ◽  
Y. Zhao ◽  
M. Mendes
Keyword(s):  
Ionic Strength ◽  
Solvent Extraction ◽  
Distribution Coefficient ◽  
Systematic Study ◽  
Chelating Agent ◽  
Constant Ionic Strength ◽  
Diethylene Triamine ◽  
Sulphate Chloride

AbstractSolvent extraction in the conditions of tracer scale chemistry was used to study protactinium(V) complexation with sulphate, chloride, oxalate and diethylene-triamine-pentaacetate. Extraction experiments were conducted using the chelating agent thenoyltrifluoroacetone (TTA) in toluene at constant ionic strength and temperature. Information on the species involved in partition equilibria relative to protactinium(V) complexation were deduced from a systematic study of the variations of distribution coefficient of Pa(V) as function of ligands, protons and TTA concentration.

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