土壤中水合氧化物型表面的化学区分——Ⅱ.电荷零点
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* 国家自然科学基金


CHEMICAL DISTINCTION OF HYDROUS OXIDE-TYPE SURFACES IN SOILS:Ⅱ. ZERO POINT OF CHARGE
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    摘要:

    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Al2O3/Si2,摩尔比呈显著的正相关。

    Abstract:

    The present paper deals with the effect of hydrous oxides on zero point of charge (ZPC) of red soils, kaolinites and synthetic amorphous aluminosilicates, and the distinction of hydrous oxide-type surfaces in soils. The results show that hydrous oxide-type surfaces could be divided into two subgroups which have completely different characteristics. In the samples of the soils and clays studied, the iron oxide (Fe-OH) and aluminium oxide (Al-OH) surfaces with s high ZPC were pH-dependent positive charge sub-surface, which tended to increase the ZPC of the samples, and silica (Si-OH) surface with a low ZPC was pH-dependent negative charge sub-surface, which tended to decrease the ZPC of the samples. The ZPC of synthetic amorphous sluminosilicates were significantly positively correlated to the Al2O3/SiO2 molar ratio of the satnpies.

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邵宗臣,汤丽雅.土壤中水合氧化物型表面的化学区分——Ⅱ.电荷零点[J].土壤学报,1992,29(3):296-301. Shao Zongchen, Tang Liya. CHEMICAL DISTINCTION OF HYDROUS OXIDE-TYPE SURFACES IN SOILS:Ⅱ. ZERO POINT OF CHARGE[J]. Acta Pedologica Sinica,1992,29(3):296-301.

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  • 在线发布日期: 2013-02-25
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