A single-extraction method using silver-thiourea for measuring exchangeable cations and effective CEC in soils with variable charges
The 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...
| Autores principales: | , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
1980
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/176729 |
| _version_ | 1855513643817369600 |
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| author | Pleysier, J.L. Juo, A.S.R. |
| author_browse | Juo, A.S.R. Pleysier, J.L. |
| author_facet | Pleysier, J.L. Juo, A.S.R. |
| author_sort | Pleysier, J.L. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | The 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. |
| format | Journal Article |
| id | CGSpace176729 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1980 |
| publishDateRange | 1980 |
| publishDateSort | 1980 |
| record_format | dspace |
| spelling | CGSpace1767292025-11-11T10:00:55Z A single-extraction method using silver-thiourea for measuring exchangeable cations and effective CEC in soils with variable charges Pleysier, J.L. Juo, A.S.R. thiourea cation exchange capacity extraction ion exchange analytical methods The 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. 1980-04 2025-09-30T10:52:55Z 2025-09-30T10:52:55Z Journal Article https://hdl.handle.net/10568/176729 en Limited Access application/pdf Pleysier, 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. |
| spellingShingle | thiourea cation exchange capacity extraction ion exchange analytical methods Pleysier, J.L. Juo, A.S.R. A single-extraction method using silver-thiourea for measuring exchangeable cations and effective CEC in soils with variable charges |
| title | A single-extraction method using silver-thiourea for measuring exchangeable cations and effective CEC in soils with variable charges |
| title_full | A single-extraction method using silver-thiourea for measuring exchangeable cations and effective CEC in soils with variable charges |
| title_fullStr | A single-extraction method using silver-thiourea for measuring exchangeable cations and effective CEC in soils with variable charges |
| title_full_unstemmed | A single-extraction method using silver-thiourea for measuring exchangeable cations and effective CEC in soils with variable charges |
| title_short | A single-extraction method using silver-thiourea for measuring exchangeable cations and effective CEC in soils with variable charges |
| title_sort | single extraction method using silver thiourea for measuring exchangeable cations and effective cec in soils with variable charges |
| topic | thiourea cation exchange capacity extraction ion exchange analytical methods |
| url | https://hdl.handle.net/10568/176729 |
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