The effect of soil mineralogical composition on soil mineral dissolution in 0.1 mol/L hydrochloric acid
2008
Mori, Y.(Kyushu Univ., Fukuoka (Japan)) | Wada, S.
Four soil samples were used to determine the effect of soil mineralogical composition on soil mineral dissolution. Soil samples were treated with 0.1 mol/L hydrochloric acid for certain periods of time to measure the amount of Al, Si and Fe in reference to the temporal variation. The result showed that the amorphous aluminosilicate minerals were mostly while the layer silicate minerals were partly dissolved after 48-hour reaction. The increase of Si/Al ratio with time suggested that after dissolution of amorphous aluminosilicate minerals, layer silicate minerals in their turn were dissolved. The amount of Al dissolved from the soil under highly acidic condition would be affected by the amount of amorphous aluminosilicate minerals (oxalate-extractable Al), soil mineralogical composition and clay content. In case of less than 1-hour reaction, the dissolved Al would be estimated only with oxalate-extractable Al.
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