Chloride and perchlorate influence on calcium-potassium and magnesium-potassium exchange

There is some uncertainty regarding the effect of the background electrolyte on Ca-Na and Mg-Na exchange. We conducted a study to see if any of the effects attributed to the background electrolyte in heterovalent exchange with Na could be observed when K was the monovalent cation. The influence of t...

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Bibliographic Details
Published inSoil Science Society of America journal Vol. 55; no. 5
Main Authors Karmarkar, S.V. (Utah State Univ., Logan, UT), Dudley, L.M, Jurinak, J.J, James, D.W
Format Journal Article
LanguageEnglish
Published 01.09.1991
Subjects
ADSORCION
ADSORPTION
CALCIO
CALCIUM
CATION
CATIONES
CHLORURE
CLORUROS
DISPONIBILIDAD DE NUTRIENTES
ECHANGE D'ION
ELECTROLITOS
ELECTROLYTE
ELEMENT NUTRITIF DISPONIBLE
INTERCAMBIO IONICO
MAGNESIO
MAGNESIUM
POTASIO
POTASSIUM
SALES
SEL
SOL ALCALIN
SOL CALCAIRE
SUELO ALCALINO
SUELO CALCAREO
TIPOS TEXTURALES DE SUELOS
TYPE DE SOL TEXTURAL
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Summary:There is some uncertainty regarding the effect of the background electrolyte on Ca-Na and Mg-Na exchange. We conducted a study to see if any of the effects attributed to the background electrolyte in heterovalent exchange with Na could be observed when K was the monovalent cation. The influence of the competing cations Ca2+ and Mg2+, on K+ exchange was evaluated by examining quantity/ intensity parameters (Q/I), Gapon-convention selectivity coefficients, and adsorbed metal charge with Cl and ClO4 as the background electrolyte. Exchange reactions were unaffected by the background electrolyte for four of the five soils studied. In those soils where exchange was unaffected by the background electrolyte, there was a significant difference between Ca-K and Mg-K Q/I curves and Gapon selectivity coefficients; Ca was preferred over Mg relative to K. The Q/1 curves from Ca-K and Mg-K systems differed in the Cl media, but not in the ClO4 media. Further, the Ca-K curve was affected by the media. Calcium-K and Mg-K selectivity coefficients differed in both Cl and ClO4 media. The Ca-K selectivity coefficients determined in ClO4 media were doser to Mg-k selectivity coefficients than those determined in Cl media. The adsorbed metal charge did not increase when the exchanger composition was changed from Mg-K to Ca-K in Cl media. The effect of the background electrolyte on Ca-K exchange was attributed to competition between K+ and CaCl+ for external exchange sites
Bibliography:P33
9327416
F04
ISSN:0361-5995
1435-0661
DOI:10.2136/sssaj1991.03615995005500050012x