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EnglishThe determination of CEC and exchangeable bases in calcareous soils has always been very difficult, because partial dissolution of the phases (e.g. CaCO3) is observed in these matrices as a result of interaction with the exchange solution rich in electrolytes. The proposed method foresees, on 10 g of soil, a saturation step with use of 1N NH4OAc, followed by washing with deionized water, contact with a solution of 0.4N NaCl and re-extraction of Na+ with the 1N NH4OAc solution. The exchangeable bases were determined in the supernatant after the 1st saturation step and CEC by measuring the concentration of Na+ removed by NH4+ and collected in the 2nd step. For both measurements optical emission spectrometry with inductively coupled plasma (ICP-OES) was used. For the trials two soil profiles of Vertisols were chosen, collected in the experimental farm “124” in Foggia (Italy), both with seven diagnostic horizons, with the amount of carbonates expressed as CaCO3 %, ranging from 10% (topsoil) to 30% (subsoil). The proposed method is well correlated with the official method for single and the sum of exchangeable bases; but not for CEC.
| Autori: | |
| Titolo: | Metodo per la determinazione delle basi scambiabili e della capacità di scambio cationico in suoli ricchi di carbonati |
| Data di pubblicazione: | 2009 |
| Abstract: | The determination of CEC and exchangeable bases in calcareous soils has always been very difficult, because partial dissolution of the phases (e.g. CaCO3) is observed in these matrices as a result of interaction with the exchange solution rich in electrolytes. The proposed method foresees, on 10 g of soil, a saturation step with use of 1N NH4OAc, followed by washing with deionized water, contact with a solution of 0.4N NaCl and re-extraction of Na+ with the 1N NH4OAc solution. The exchangeable bases were determined in the supernatant after the 1st saturation step and CEC by measuring the concentration of Na+ removed by NH4+ and collected in the 2nd step. For both measurements optical emission spectrometry with inductively coupled plasma (ICP-OES) was used. For the trials two soil profiles of Vertisols were chosen, collected in the experimental farm “124” in Foggia (Italy), both with seven diagnostic horizons, with the amount of carbonates expressed as CaCO3 %, ranging from 10% (topsoil) to 30% (subsoil). The proposed method is well correlated with the official method for single and the sum of exchangeable bases; but not for CEC. |
| Nome del convegno: | Il suolo: una risorsa primaria per l'uomo e l'ambiente |
| Luogo del convegno: | Perugia |
| Data inizio evento: | 2009-06-17 |
| Data fine evento: | 2009-06-19 |
| Lingua: | Italiano |
| Titolo del libro: | Book of abstract Convegno SISS Perugia 17-19 giugno 2009 |
| ISBN: | N/A |
| Editore: | Università degli Studi di Perugia |
| Citazione: | Silva, S., Baffi, C., Spalla, S., Cassinari, C., Lodigiani, P., Metodo per la determinazione delle basi scambiabili e della capacità di scambio cationico in suoli ricchi di carbonati, Abstract de <<Il suolo: una risorsa primaria per l'uomo e l'ambiente>>, (Perugia, 17-19 June 2009 ), Università degli Studi di Perugia, Perugia 2009: 12-12 [http://hdl.handle.net/10807/86490] |
| Appare nelle tipologie: | Abstract (se pubblicati in Atti di Convegno, Congresso, ecc.) |
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