The determination of cation-exchange characteristics of saline and calcareous soils.
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An improved method for the determination of cation exchange characteristics suitable for saline, calcareous and gypseous soils has been developed. The soil is saturated with a LiCl solution buffered at pH 8,2 with LiOAc, followed immediately by leaching with Ca(OAc) 2 at pH 8,2. Na, K, Ca, Mg and Li are determined in the extracts by direct flame photometry and complexo-metry. The necessity of washing the soil has been eliminated by assaying the remaining excess salts as CI. Soluble ions are determined on a separate sample. The method can be used on non-saline or carbonatefree soils by adjusting the saturating and extracting solutions to pH 7.
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[2] R. Storie. Methods of Chemical Analysis for Soil Survey Samples , 1957 .
[3] D. Thorne. Diagnosis and Improvement of Saline and Alkali Soils , 1954 .