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Effect of Phosphate Salts as Saturating Solutions in Cation‐Exchange Capacity Determinations
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1972
Year
Cation‐exchange Capacity DeterminationsSaturating SolutionsEngineeringSoil MineralogyNano 3ChemistrySolution (Chemistry)Soil BiochemistryChemical EngineeringEnvironmental ChemistryEnvironmental GeochemistryAnalytical ChemistryNegative ChargeIon ExchangeEnvironmental EngineeringSoil ChemistryPhosphate SaltsGeochemistryCation‐exchange Capacities
Abstract 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.