DLVO and hydration forces between mica surfaces in Li+, Na+, K+, and Cs+ electrolyte solutions: A correlation of double-layer and hydration forces with surface cation exchange properties

Potentiometric titrations of aluminium(III) phosphate have been performed in the presence of aqueous electrolyte solutions containing Cu2+, Zn2+, Ni2+ and K+ ions as a function of the concentration of the latter, the pH and the temperature. The sorption of Zn2+ ions has also been studied and the data for metal ion sorption shown to correlate with the Potentiometric titration data, indicating that the process responsible for metal ion uptake is ion exchange. The pKa value of the exchanger and its thermodynamic parameters have been evaluated.

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A proposed new reagent for the measurement of cation exchange properties of carbonate soils

Soil Research ◽

10.1071/sr9850633 ◽

1985 ◽

Vol 23 (4) ◽

pp. 633 ◽

Cited By ~ 8

Author(s):

BM Tucker

Keyword(s):

Calcium Carbonate ◽

Cation Exchange ◽

Charge Exchange ◽

Double Layer ◽

Aqueous Ethanol ◽

Choline Chloride ◽

Exchange Capacity ◽

Exchangeable Cations ◽

Layer Charge ◽

Exchange Properties

A solution of choline chloride (1 mol L-1) in aqueous ethanol (65% by weight) is proposed as a reagent for extracting double-layer exchangeable cations from soils containing calcium carbonate, instead of the previously used solution of NH4Cl (1 mol L-1) at pH 8.5 in aqueous ethanol. This choline chloride reagent gives better estimates of double-layer exchangeable cations and of double-layer charge (exchange capacity) because it dissolves less CaCO3, and reacts less with specifically adsorbed forms of Ca, Mg and K than the NH4Cl reagent does. Because plants can use both adsorbed and exchangeable cations, the new reagent is not suitable for measuring nutrient cation availabilities. Cation exchange values for a range of Australian carbonate soils are presented to show the differences to be expected between analyses by the choline chloride and the NH4Cl reagents.

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Hydrous oxides and their cation-exchange properties

Journal of Biochemical Toxicology ◽

10.1002/jbt.2570151001 ◽

1965 ◽

Vol 15 (10) ◽

pp. 445-448 ◽

Cited By ~ 1

Author(s):

C. Heitner-Wirguin ◽

A. Albu-Yaron

Keyword(s):

Cation Exchange ◽

Hydrous Oxides ◽

Exchange Properties

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95/05923 Cation exchange properties of hydrothermally treated coal fly ash

Fuel and Energy Abstracts ◽

10.1016/0140-6701(95)97561-w ◽

1995 ◽

Vol 36 (6) ◽

pp. 421

Keyword(s):

Fly Ash ◽

Cation Exchange ◽

Coal Fly Ash ◽

Exchange Properties

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SOIL AND SOLUTION pH AND SODIUM:CALCIUM RATIO: EFFECTS ON CATION EXCHANGE PROPERTIES OF A SODIUM-SATURATED CHERNOZEMIC SOIL

Canadian Journal of Soil Science ◽

10.4141/cjss84-013 ◽

1984 ◽

Vol 64 (1) ◽

pp. 139-146

Author(s):

THERON G. SOMMERFELDT

Keyword(s):

Cation Exchange ◽

Soil Ph ◽

Irrigation Water ◽

Polynomial Equation ◽

Exchangeable Sodium Percentage ◽

Exchangeable Sodium ◽

Solution Ph ◽

Chernozemic Soil ◽

Sodium Percentage ◽

Exchange Properties

The effects of soil and solution pH and Na:Ca ratio in solution on the exchangeable Na, Ca, and (Na + Ca) of a Na-saturated Dark Brown Chernozemic soil were studied. At soil pH 9.0, the exchangeable Na, Ca, and (Na + Ca) were 14.5, 25.4, and 21.8% greater than at soil pH 6.0. Solution pH (6.0–9.0) had small but statistically significant effects on the amount of Na and Ca adsorbed by the soil. The logarithm of exchangeable sodium percentage (ESP) was related to the Na fraction in the solution by a polynomial equation, log ESP = 0.93 [Na/(Na + Ca)]2 + 0.16 [Na/(Na + Ca)] + 0.82. Not only is replacement of exchangeable Na with Ca important in the reclamation of this soil, should it become sodic and have a high pH, but also lowering of its surface charge, through lowering of its pH, would be an important factor in its reclamation. It appears impractical to reduce soil pH by applying acidified irrigation water. Acidic amendments such as gypsum and sulfur may be more suitable. Key words: Cation exchange, solution pH, soil pH

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