土壤胶体的电荷类型 （Surface charge on soil colloids ） （二）可变电荷（pH dependent charge）日本吉田叫它外电荷 随着土壤溶液pH变化而变化的电荷叫可变电荷。
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The variation of this pH range was dependent on the strength of the base, the volume of the conjugated acid cation, and whether this cation can increase the surface charge of the micelles or not, etc.
这一范围的大小（宽窄）受制于碱的强弱、共轭酸阳离子的体积以及共轭酸阳离子是否能增加胶束表面的电荷等几个方面。
In the studied samples, iron and aluminium oxide were pH-dependent positive charge surface, silica was pH-dependent negative charge surface.
在所研究的样本中，氧化铁和氧化铝是带可变正电荷的亚表面，而氧化硅是带可变负电荷的亚表面。
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