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Effect of Phosphate Salts as Saturating Solutions in Cation‐Exchange Capacity Determinations
Author(s) -
Schalscha E. B.,
Pratt P. F.,
Kinjo T.,
Amar A J.
Publication year - 1972
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1972.03615995003600060022x
Subject(s) - oxisol , cation exchange capacity , chemistry , alfisol , ion exchange , phosphate , inorganic chemistry , soil water , neutralization , nuclear chemistry , ion , soil science , geology , organic chemistry , biology , antibody , immunology
Cation‐exchange capacities with KCl or NaNO 3 in volcanic ash soils varied from 6 to 18 meq/100 g whereas CEC with KH 2 PO 4 or NaH 2 PO 4 varied from 78 to 188. Cation‐exchange capacities with NaH 2 PO 4 and NaNO 3 were 28 and 6, respectively, for an alfisol and 12 and 2, respectively, for an oxisol. The ratios of CEC with H 2 PO 4 ‐ as compared to Cl ‐ or NO 3 ‐ varied from about 4 to 30. The effect of the H 2 PO 4 ‐ is explained as a result of neutralization of positive charge in the soil with a simultaneous release of negative charge.