如果溶液远离这个等电位点，那么蛋白质会是高度可溶的因此表面张力梯度就无法形成；如果太接近这个等电位点，蛋白质会析出沉淀。
If the solution is too far from the IEP, the proteins are highly soluble and surface tension gradients never develop; too close, and the proteins precipitate out.
可作为评价材料点蚀敏感性指标，要比传统指标（如点蚀电位和阳极极化曲线滞后环面积等）更加优越。
They had superiority as the indexes of materials pitting sensitivity than the traditional indexes such as, the pitting potential, the lag ring area in scan anodic.
结论：酸碱双点电位法具有简便、快速、准确等特点，在有机弱酸弱碱性药物分析中有一定的实用前景。
Conclusion: The acid base doub1e points potentiometric method is simple, rapid and precise, and has prospect of application in analysing organic weak acid and base medicines.
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