Vorstellung der SrCl2-Methode nach Bach zur Bestimmung der effektiven Kationenaustauschkapazität und Vergleich mit der NH4Cl-Methode |
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| Authors: | Peter Snger-Von Oepen Thorsten Nack Josefa Nixdorf Burchard Menke |
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| Institution: | Peter Sänger-Von Oepen,Thorsten Nack,Josefa Nixdorf,Burchard Menke |
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| Abstract: | Presentation of the SrCl2-method after Bach for the determination of the effective cation exchange capacity and comparison with the NH4Cl-method The SrCl2-method for the determination of the effective cation exchange capacity CECeff has been developed by Dr. H. Bach, a former geochemist of the “Geologisches Landesamt Schleswig-Holstein”. Exchangeable metallic cations in soils are displaced by a 0, 1 M SrCl2-solution and analyzed from the percolate. Reexchange of strontium by a 0, 1 M MgCl2-solution allows to determine the CECeff by analyzing for strontium in the second percolate. In comparison with the customary application of NH4Cl, SrCl2 shows the following advantages: - 1 The nearly unbuffered SrCl2-solution adopts instantly the pH of the soil.
- 2 In contrast to the weakly acid NH4Cl-solution, no H3O+-cations compete with the exchange cation. Furthermore, partial dissolution of clay minerals is prevented because of the near-neutral character of the SrCl2-solution.
- 3 The SrCl2-method can be applied on all types of soils including carbonate- and salt-bearing soils.
- 4 The amount of free (dissolved) cations can be approximated.
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