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Amorphous Material in Some Papua New Guinea Soils

Author:
Parfitt, R. L.
Source:
Soil Science Society of America journal 1972 v.36 no.4 pp. 683-686
ISSN:
0361-5995
Subject:
allophane, aluminum oxide, clay, clay fraction, gels, goethite, infrared spectroscopy, iron, kaolinite, silica, sodium carbonate, sodium hydroxide, tropical soils, volcanic ash soils, Papua New Guinea
Abstract:
The clay fraction of five tropical soils was extracted successively with dithionite-citrate-bicarbonate, 2% sodium carbonate and, 0.5M sodium hydroxide. Large amounts of clay were dissolved from all soils except the solodic soil. Differential infrared spectroscopy showed that allophane was dissolved from the volcanic ash soils together with iron and alumina gels. Goethite and disordered kaolinite were extracted from the latosol. No amorphous silica was present in the solodic soil.
Agid:
6696875