红壤黄壤及紫色土表面电荷性质的研究

On Surface Charge Properties of Red,Yellow and Calcareous Purplish Soils

运用带电颗粒表面性质联合分析法,测定了不同pH值条件下(pH7和4.5)下红壤、黄壤和石灰性紫色土的表面电荷性质.结果表明:在相同pH值条件下,石灰性紫色土比可变电荷土壤有较高的表面电位、表面电场强度、表面电荷数量和比表面积,且3种土壤的表面电场强度都可达108 V/m的数量级;随着pH值的降低,3种土壤的表面电荷数量和表面电荷密度显著减小;pH值为4.5时,红壤和黄壤的表面电位和表面电荷数量接近.

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.