A single-extraction method using silver-thiourea for measuring exchangeable cations and effective CEC in soils with variable charges

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dc.creatorPleysier, J.L.
dc.creatorJuo, A.S.R.
dc.date1980-04
dc.date2025-09-30T10:52:55Z
dc.date2025-09-30T10:52:55Z
dc.date.accessioned2026-06-27T15:49:53Z
dc.descriptionThe use of a single extraction with dilute unbuffered silver-thiourea (AgTU) solution (0.01 M Ag+) for measuring exchangeable cations and the cation exchange capacity (CEC) of soils was compared with the conventional effective CEC method, which used N NH4OAc displacement for exchangeable “bases” (Ca, Mg, K, Na) and N KCI extraction for exchange acidity (Al + H). Fifty-seven selected surface and lower B horizon samples of Alfisols, Ultisols, and Oxisols with low-activity clays derived from a wide range of parent materials were used. The two extraction methods gave essentially the same CEC values for all soils studied (R2 = 0.92). Good agreements were also obtained between the dilute AgTU-extractable bases (Ca, Mg, K, Na) and N NH4OAc-extractable bases. The dilute AgTU extraction gave slightly larger values of exchange acidity (Al + H) than the N KCl extraction for most soils. The single-extraction method using unbuffered Ag-thiourea is suitable for rapid, routine measurements of effective CEC and exchangeable cations for soils dominating in variable-charge colloids.
dc.formatapplication/pdf
dc.identifierhttps://hdl.handle.net/10568/176729
dc.identifier.urihttp://hdl.handle.net/123456789/114742
dc.languageen
dc.publisherOvid Technologies (Wolters Kluwer Health)
dc.rightsLimited Access
dc.sourcePleysier, J. L., & Juo, A. S. R. (1980). A single-extraction method using silver-thiourea for measuring exchangeable cations and effective CEC in soils with variable charges. Soil Science, 129, (4), 205-211.
dc.subjectthiourea
dc.subjectcation exchange capacity
dc.subjectextraction
dc.subjection exchange
dc.subjectanalytical methods
dc.titleA single-extraction method using silver-thiourea for measuring exchangeable cations and effective CEC in soils with variable charges
dc.typeJournal Article

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Instituto Internacional de Agricultura Tropical (IITA)