Metodo per la determinazione delle basi scambiabili e della capacità di scambio cationico in suoli ricchi di carbonati

Translated title of the contribution: [Autom. eng. transl.] Method for determining the exchangeable bases and the cation exchange capacity in soils rich in carbonates

Chiara Cassinari, Sandro Silva, Claudio Baffi, Stefano Spalla, Paolo Lodigiani

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.
Translated title of the contribution[Autom. eng. transl.] Method for determining the exchangeable bases and the cation exchange capacity in soils rich in carbonates
Original languageItalian
Title of host publicationBook of abstract Convegno SISS Perugia 17-19 giugno 2009
Pages12
Number of pages1
Publication statusPublished - 2009
EventIl suolo: una risorsa primaria per l'uomo e l'ambiente - Perugia
Duration: 17 Jun 200919 Jun 2009

Conference

ConferenceIl suolo: una risorsa primaria per l'uomo e l'ambiente
CityPerugia
Period17/6/0919/6/09

Keywords

  • CSC
  • ICP-OES
  • basi scambiabili
  • suoli ricchi in carbonati

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