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前言Nernst方程式把一个容易精确测定的物理量——ψ与体系的其它热力学量联结在一起,是现代基础化学中应用最广泛的公式之一,引起了化学工作者多方面的兴趣。Pourbaix 首先根据 Nernst 方程式和物质的水解知识构制了 M-H_2O 体系的ψ-pH 平衡图(又称物质优势范围图);该图展示出含 M 的各种不同物质M_i各有一定优势存在范围。它直观易懂、概括全貌,深为化学工作者所欢迎。对于物质的数量与体系电位ψ的关系,Sillén、Tabbutt 曾经绘制ψ-log a 或ψ-log.
INTRODUCTION The Nernst equation, which combines the easily quantifiable physical quantity - ψ with other thermodynamic quantities in the system - is one of the most widely used formulas in modern basic chemistry and has drawn chemists’ many interests. Pourbaix first constructed the ψ-pH equilibrium diagram of M-H_2O system (also known as the DOM curve) according to the Nernst equation and the knowledge of hydrolysis of the material; this figure shows that each of the various M-containing M_i has its own advantages . It is intuitive and easy to understand, a general overview, deeply welcomed by chemists. For the relationship between the number of species and the system potential ψ, Sillén, Tabbutt used to plot ψ-log a or ψ-log.