Comparison of different extractants for the determination of inorganic sulphate in gypsum‐free agricultural soils |
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Authors: | Viktor Schmalz,Thomas Grischek,Grit Gerstä cker,Eckard Worch |
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Abstract: | Four frequently used extractants (H2O, 0.1 M NaCl, 0.016 M KH2PO4, and 0.5 M NaHCO3) as well as different extraction conditions have been tested for sulphate extraction from gypsum‐free agricultural soils. Water is the preferable extractant for soils with pH > 6. Two extraction steps have to be carried out for complete extraction (> 95%). A 0.016 M KH2PO4 solution was found to be the most efficient extractant for soils with a pH < 6 within a single extraction step. A shaking frequency of 170 min‐1 and a duration of extraction of 4 hours are the optimized conditions for the sulphate extraction with H2O and KH2PO4 solution. |
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Keywords: | soil extractant soil‐to‐extractant ratio sulphate |
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