Abstract
The interlayered hydroxy-aluminum of a chlorite-smectite intergrade in a dark-red soil derived from a pyroxene andesite altered by hydrothermal action was extracted easily by boiling treatments using both sodium-citrate and ammonium-fluoride solutions. Moreover, this interlayered aluminum was released partially by using a dithionite-citrate-bicarbonate system and an acid ammonium-oxalate solution which were prepared originally for removing the coexistent sesquioxides from soils.
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