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用双氧水破坏土壤有机质和用DCB（连二亚硫酸钠／柠檬酸钠／重碳酸钠）脱铁等方法研究湘南第四纪红粘土及其发育的土壤的表面电荷性质．结果表明：去除土壤有机质．使红壤胶体表面的阴离子交换量（AEC）增加、可变负电荷量（CECV）降低，在多数情况下其永久负电荷量（CECP）增加；脱游离氧化铁使红壤AEC减少、CECp增加，CECV增减不一．笔者认为，这与土壤胶体组分之间的相互作用有关．
The surface charge properties of Quaternary red clay and its developing soils in southern Hunan were studied by using H2O2 to destroy soil organic matter and removing iron with DCB (sodium dithionite / sodium citrate / sodium bicarbonate). The results show that soil organic matter is removed. (AEC) and CECV decreased, and the permanent negative charge (CECP) increased in most cases. Detached iron oxide decreased the AEC, CECp and CECV in the red soil, Increase or decrease. In my opinion, this is related to the interaction between soil colloidal components.