DETERMINATION OF ALLOPHANE AND AMORPHOUS INORGANIC MATTER IN CLAY FRACTION OF SOILS : I. Allophane and Allophane-Halloysite Mixture
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The quantitative determination of allophane and amorphous inorganic matter by means of an alternate dissolution with 8 N HCl and 0.5 N NaOH, a dissolution with boiled 0.5 N NaOH, an extraction with acid ammonium oxalate solution, the cation-exchange capacity delta value of allophane, and a new method proposed in this study was discussed using allophane-halloysite mixture samples. The new method proposed here is based on the difference of weight loss with heating between 105 and 200℃. In the mixture samples, it was made clear that the method using the alternate dissolution with HCl and NaOH solution was the best suited for the purpose, and the method based on the weight loss with heating gave similar results. The contents of allophane and amorphous matter obtained by means of measuring the weight loss with heating were only approximate but the procedure is very simple and easy.
- 一般社団法人日本土壌肥料学会の論文
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