Chemistry of Variable Charge Soils (Topics in Sustainable by T. R. Yu

By T. R. Yu

This e-book, according to learn conducted on the Academia Sinica during the last 30 years, explains the fundamental distinction among the variable cost soils of tropical and subtropical areas, and the consistent cost soils of temperate areas. it's going to specialise in the chemical homes of the variable cost soils--properties that have vital concerning soil administration practices, together with maximizing soil productiveness and fighting soil pollutants.

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Additional resources for Chemistry of Variable Charge Soils (Topics in Sustainable Agronomy)

Sample text

This is the reason why variable charge minerals such as iron and aluminum oxides carry negative charge when the pH is higher than their zero point of charge and carry positive charge when the pH is lower than their zero point of charge. Therefore, when examining the surface charge of a given soil, it is necessary to consider the pH of that soil at the same time. 2 Concentration of Electrolyte The quantity of surface charge of variable charge soils varies with the concentration of electrolyte. This is another characteristic feature of variable charge soils as compared to constant charge soils.

The parameter pH0 is a characteristic feature inherent in a system and is independent of the permanent charge of the system. 1 Charged Surface Fig. 1. ZPNC, pH0 and p 25 in relation to electrolyte concentration C. adsorbed cations or anions in the electrolyte solution, this pH0 may change. On the other hand, ZPNC is a parameter characterizing the relationship between net surface charge composed of electric charges of all origins and pH in a mixed system. It is affected by both the nature and the concentration of the electrolyte.

7. It can be seen that for all the soils the quantity of Fig. 5. Change in surface charge of Ferrali-Haplic Acrisol (Xishuangbanna) with pH before and after removal of free iron oxides (Zhao and Zhang, 1991). 2 Contribution of Soil Components to Surface Charge 31 Fig. 6. Change in surface charge of Ferric-Haplic Acrisol with pH before and after removal of free iron oxides (Zhao and Zhang, 1991). positive surface charge increases with the decrease in pH. 6 Fig. 7. Change in surface charge of Hyper-Rhodic Ferralsol with pH before and after removal of free iron oxides (Zhao and Zhang, 1991).

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