RAPID ANALYSIS OF CATION-EXCHANGE PROPERTIES IN ACIDIC SOILS

In this paper, ammonium acetate-1,2-diaminocyclo-hexanetetracetic acid is proposed as an extractant for the determination of cation exchange properties of acidic soils. The conditions for the spectrophotometric determination of exchange acidity with ethyl red in soil extracts wer e studied. Results are in reasonable agreement with those obtained by routine HCl titration after extraction with BaCl2-triethanolamine. Exc hangeable bases in the soil extract can be determined with atomic abso rption spectroscopy or photometrically using chlorophosphonazo III xyl idyl blue I, and flamephotometry. After removal of the extractant, cat ion exchange capacity can be determined.