On Surface Charge Properties of Red,Yellow and Calcareous Purplish Soils
The surface properties of red, yellow and calcareous purplish soils have been determined based on the combined method for surface properties determination to discuss its application to soils with variable charges (red earth and yellow soil) and constant charges under different pH (pH 7 and 4. 5) values. The results show that the surface potential, electrostatic field strength at surface, surface charge number and surface charge density of calcareous purplish soil are higher than that of variable soils under the same pH value, and the surface electrostatic field strength of all the three soils are more than 108V/m. With the decrease of pH, the surface charge number and surface charge density of the three soils dramatically decreased. When the pH is 4. 5, the surface potential and surface charge number of red soil are almost equal to that of the yellow soil.
surface potentialelectrostatic field strength at surfacespecific surface area
NETL
NSTL
万方数据
维普
