Cation Exchange Equilibria at Constant Ionic Strength

1950 ◽  
Vol 72 (5) ◽  
pp. 2292-2293 ◽  
Author(s):  
Stanley W. Mayer
Keyword(s):  
Ionic Strength ◽  
Cation Exchange ◽  
Constant Ionic Strength

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

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.

Effects of pH and ionic strength on the cation exchange capacity of soils with variable charge

Soil Research ◽  
1981 ◽  
Vol 19 (1) ◽  
pp. 93 ◽  
Author(s):  
GP Gillman
Keyword(s):  
Ionic Strength ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Surface Soils ◽  
Ph Values ◽  
Variable Charge ◽  
Effects Of Ph ◽  
Variable Charge Soils

The cation exchange capacity of six surface soils from north Queensland and Hawaii has been measured over a range of pH values (4-6) and ionic strength values (0.003-0.05). The results show that for variable charge soils, modest changes in electrolyte ionic strength are as important in their effect on caton exchange capacity as are changes in pH values.

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.

Effect of temperature on quantifying glycated (glycosylated) hemoglobin by cation-exchange chromatography.

1985 ◽  
Vol 31 (1) ◽  
pp. 114-117 ◽  
Author(s):  
R Flückiger ◽  
T Woodtli
Keyword(s):  
Ionic Strength ◽  
Cation Exchange ◽  
High Performance ◽  
Glycated Hemoglobin ◽  
Operating Temperature ◽  
Glycosylated Hemoglobin ◽  
Regression Line ◽  
Exchange Chromatography ◽  
Effect Of Temperature ◽  
Cation Exchange Chromatography

Abstract As a consequence of nonideal chromatographic conditions, values for stable glycated hemoglobin (HbA1c) determined by cation-exchange chromatography in a commercial minicolumn system (y) or by "high-performance" liquid chromatography (x) differ markedly, yielding the regression line y = 0.82x + 0.6. With use of the protocol specified by the manufacturer, 20% of the HbA1c peak is not collected in the HbA1c fraction. Increasing the ionic strength of the eluting buffer by increasing the operating temperature to 28 degrees C increases the rate of elution from the minicolumn, making results of the two methods more closely comparable (y = 0.98x - 0.22). Because at a given pH the elution volume is determined primarily by the ionic strength, close limits on the composition of the eluting buffer are set by the temperature-dependence of its ionic strength. At a specified temperature and pH the position of a peak can be judged to within a volume of 1 mL if the conductivity of the eluent does not vary by more than +/- 0.05 mS.

Investigation of copper adsorption to peat using the simple metal sorption model

2001 ◽  
Vol 44 (11-12) ◽  
pp. 477-483 ◽  
Author(s):  
S. Dierks
Keyword(s):  
Ionic Strength ◽  
Cation Exchange ◽  
Proton Exchange ◽  
Mass Action ◽  
Model Parameters ◽  
Copper Binding ◽  
Metal Sorption ◽  
Power Functions ◽  
Simple Metal ◽  
Copper Adsorption

The Simple Metal Sorption (SiMS) equilibrium model was used to simulate the proton/cation exchange behavior of peat with dissolved copper. The SiMS model represents proton binding and metal binding as cation exchange for heterogeneous sorbents as a function of pH, salt concentration, total metal concentration and total ligand concentration. The SiMS model uses fewer parameters than other cation exchange models for multidimensional datasets and can be executed on a standard spreadsheet. The cation exchange selectivity coefficient, KMe,app, is represented as KMe,app=KMe{H+}α(LT/MeT)βIphiv. The model is similar to standard surface complexation approaches, with an intrinsic relationship described by mass action laws (KMe=metal equilibrium constant) and variable terms that are expressed as simple power functions of proton concentration, ligand to metal ratio (LT/MeT), and ionic strength (I). The model successfully simulated the proton exchange behavior of acid-washed, Sphagnum peats over a range of 4 to 8 pH units with ionic strength differing by three orders of magnitude (I=0.001 to 0.1). Simulation of copper binding on five peat data sets and the dried biomass of Potamogeton lucens was also successful (0.94<r2<0.99). However, there was no apparent relationship between model parameters and peat characteristics. Incorporation of the SiMS model into a framework for predicting metals removals in wetlands will require more work.

Absorption of Na, K, and Ca by barley roots at constant ionic strength

1963 ◽  
Vol 18 (1) ◽  
pp. 133-139 ◽  
Author(s):  
A. K. Helmy ◽  
M. N. Hassan ◽  
S. Taher
Keyword(s):  
Ionic Strength ◽  
Constant Ionic Strength
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