Cation exchange properties of crown ether-phosphotungstic acid precipitates

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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Quantitative determination of phillipsite in tuffs based on its cation-exchange properties

Reactive Polymers ◽

10.1016/0923-1137(93)90080-y ◽

1993 ◽

Vol 19 (3) ◽

pp. 225-231 ◽

Cited By ~ 1

Author(s):

J.E. Garcia ◽

M.M. Gonzalez ◽

J.S. Notario ◽

J.M. Caceres

Keyword(s):

Quantitative Determination ◽

Cation Exchange ◽

Exchange Properties

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Cation-Exchange Properties of Zirconium (IV)–Tungsten (VI) Precipitates

Nature ◽

10.1038/1771128a0 ◽

1956 ◽

Vol 177 (4520) ◽

pp. 1128-1129 ◽

Cited By ~ 26

Author(s):

KURT A. KRAUS ◽

THOMAS A. CARLSON ◽

JAMES S. JOHNSON

Keyword(s):

Cation Exchange ◽

Exchange Properties

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Cation-exchange properties of some acid soils of california

Hilgardia ◽

10.3733/hilg.v33n13p689 ◽

1962 ◽

Vol 33 (13) ◽

pp. 689-706 ◽

Cited By ~ 16

Author(s):

P. F. Pratt ◽

F. L. Bair

Keyword(s):

Cation Exchange ◽

Acid Soils ◽

Exchange Properties

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Effects of high pH solutions with large monovalent cation concentrations on cation exchange properties

Soil Research ◽

10.1071/sr9960229 ◽

1996 ◽

Vol 34 (2) ◽

pp. 229 ◽

Cited By ~ 2

Author(s):

RE Liefering ◽

CDA Mclay

Keyword(s):

Organic Matter ◽

Cation Exchange ◽

Negative Charge ◽

Monovalent Cation ◽

Exchange Capacity ◽

Exchangeable Cations ◽

Ion Concentration ◽

Exchangeable Sodium ◽

High Ph ◽

Exchange Properties

Disposal of strongly alkaline industrial liquid wastes, which contain large monovalent cation concentrations, by means of land treatment systems is becoming increasingly common. This study investigated the effects of solutions with large monovalent cation concentrations and high pH on cation exchange properties in four New Zealand soils with different clay mineralogies. The soils were shaken with a range of concentrations (0–0.3 M) of NaOH, KOH, NaCl, and KCl. Cation exchange capacity (CEC) and exchangeable cations (Ca2+, Mg2+, K+, and Na+) were measured following shaking and washing procedures. Although the hydroxide solutions dissolved significant amounts of organic matter from all soils, there was still a net increase in CEC measured at all hydroxide concentrations. The magnitude of the CEC increase was dependent on hydroxide concentration. The increase in CEC is attributed to newly generated negative charge on surfaces which possess variable charge (i.e. pH dependent) characteristics such as edge sites of clay minerals, sesquioxides, and the undissolved organic matter remaining in the soil. In contrast to hydroxide solutions, no increase in CEC was measured in chloride-treated samples. Increases in the concentration of all treatment solutions resulted in increases in the exchangeable ion concentration of the index cation used in the treatment solution (either Na+ or K+) and decreases in concentration of the other three exchangeable cations. In general, higher exchangeable sodium percentage (ESP) values were measured in samples treated with NaOH than samples treated with NaCl at all concentrations. Similarly, higher exchangeable potassium percentage (EPP) was measured in samples treated with KOH than samples treated with KCl at all concentrations. The higher ESP and EPP values recorded when hydroxide solutions were used as treatments are attributed to the newly generated negative charges being counter-balanced by the monovalent index cation present in the treatment solution. It is suggested that existing equations commonly used to predict ESP and EPP values are unsuccessful for accurately predicting changes when soils are treated with hydroxide solutions, due to their inability to account for the newly generated exchange sites. The equations did, however, adequately predict the effects of both chloride solutions on ESP and EPP.

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Cation exchange properties of low rank Turkish coals: removal of Hg, Cd and Pb from waste water

Fuel Processing Technology ◽

10.1016/s0378-3820(00)00126-0 ◽

2000 ◽

Vol 68 (2) ◽

pp. 111-120 ◽

Cited By ~ 37

Author(s):

Çigdem Arpa ◽

Emel Başyilmaz ◽

Sema Bektaş ◽

Ömer Genç ◽

Yuda Yürüm

Keyword(s):

Waste Water ◽

Cation Exchange ◽

Low Rank ◽

Exchange Properties

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Cation-exchange properties of lipid films

Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism ◽

10.1016/0005-2760(67)90136-1 ◽

1967 ◽

Vol 137 (3) ◽

pp. 549-556 ◽

Cited By ~ 37

Author(s):

Kimizuka Hideo ◽

Nakahara Tatsuo ◽

Uejo Hiromichi ◽

Yamauchi Akira

Keyword(s):

Cation Exchange ◽

Lipid Films ◽

Exchange Properties

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