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本文研究了氧化物对红壤、高岭土和合成无定形铝硅酸盐的电荷零点的影响,并讨论了土壤中水合氧化物型表面的区分。结果表明,水合氧化物型表面可进一步区分为电荷性质完全不同的两类亚表面。在所研究的土壤和粘土样本中,有高ZPC的氧化铁(Fe—OH)和氧化铝(Al—OH)表面,是带可变正电荷的亚表面,使样本的ZPC趋于上升;而有低ZPC的氧化硅(Si—OH)表面,是带可变负电荷的亚表面,使样本的ZPC趋于下降。合成无定形铝硅酸盐的电荷零点与样本的Al_2O_3/Si_2,摩尔比呈显著的正相关。
In this paper, the effects of oxides on the charge zero of red soil, kaolin and synthetic amorphous aluminosilicates were investigated. The distinction of hydrous oxide-based surfaces in soil was also discussed. The results show that the hydrous oxide type surface can be further divided into two types of subsurfaces with completely different charge properties. In the soil and clay samples studied, the surface of high-ZPC ferric oxide (Fe-OH) and aluminum oxide (Al-OH) is a subsurface with a positively charged surface, which tends to increase the ZPC of the sample; The silicon oxide (Si-OH) surface with low ZPC is a subsurface with a variable negative charge, which tends to decrease the ZPC of the sample. The zero charge of the synthesized amorphous aluminosilicate has a significant positive correlation with the Al 2 O 3 / Si 2 molar ratio of the sample.