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Point of zero salt effect: Relationships with clay mineralogy of representative soils of the Sao Paulo State, Brazil

作者：

Marcelo Eduardo Alves;Arquimedes Lavorent

关键词：

subscript;ph;pzse;kcl;h2o;tropical soil

摘要：

The point of zero salt effect (PZSE) is the soil pH value at which the magnitude of the variable surface charges is not changed due to variations in the ionic concentration of the soil solution. This property influences not only electrochemical phenomena occurring at the solid-solution interface but also the flocculation degree of the soil particles. In this study we investigated the relationships between the clay mineralogy and the PZSE values of representative soils of the Sao Paulo State, Brazil. The results confirmed the usefulness of the difference between the soil pH values measured in 1 mol L-1 KCl (pH(KCl)) and in water (pH(H2O)) (2 pH(KCl) - pH(H2O)) for estimating the PZSE of tropical soils, except for the ones rich in exchangeable Al; furthermore, the Delta pH index (pH(KCl) - pH(H2O)) was highly correlated with the difference between the PZSE and pH(H2O) values, reiterating the Delta pH utility for estimating both the signal and the magnitude of the net surface charge of tropical soils. Finally, correlation and multiple regression analyses showed that the PZSE value of weathered non-allophanic tropical soils tends to increase and to equal the soil pH due to the weathering-induced kaolinite destabilization and concomitant Fe- and Al-oxide accumulation.

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Point of zero salt effect: Relationships with clay mineralogy of representative soils of the Sao Paulo State, Brazil

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