This study investigates the effects on soil clay mineralogy of Na-hexametaphosphate, dithionite-citrate-bicarbonate (DCB), NH4-oxalate and hydrogen peroxide. The hydrogen peroxide is the most harmful treatment: it alters the swelling behaviour of montmorillonites, partially opens the interlayers of illite minerals and causes an underestimate of the lithogenetic chlorites. The NH4-oxalate treatment also causes a decrease in the lithogenetic chlorites content while the DCB treatment seems to reduce the hydroxy-interlayered vermiculite component. Na-hexametaphosphate is found to be harmful for the pedogenetic chlorite components.
Effects of some chemical pretreatments on soil clay mineralogy.
BONIFACIO, Eleonora;
1992-01-01
Abstract
This study investigates the effects on soil clay mineralogy of Na-hexametaphosphate, dithionite-citrate-bicarbonate (DCB), NH4-oxalate and hydrogen peroxide. The hydrogen peroxide is the most harmful treatment: it alters the swelling behaviour of montmorillonites, partially opens the interlayers of illite minerals and causes an underestimate of the lithogenetic chlorites. The NH4-oxalate treatment also causes a decrease in the lithogenetic chlorites content while the DCB treatment seems to reduce the hydroxy-interlayered vermiculite component. Na-hexametaphosphate is found to be harmful for the pedogenetic chlorite components.
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