Potentiometric Methods These methods rely on the measurement of Ecell for quantification. A number of common reference and ion selective electrodes are reviewed along with general calculations and analytical approaches §4 Potentiometry
Potentiometric Methods These methods rely on the measurement of Ecell for quantification. A number of common reference and ion selective electrodes are reviewed along with general calculations and analytical approaches §4 Potentiometry
本章主要内容 • 电位分析法基本原理 • 离子选择性电极与膜电位 • 离子选择性电极的选择性 • 离子选择性电极的种类与性能 • 测定离子活（浓）度的方法 • 电位滴定法 • 重点掌握电位分析法的基本原理，掌握溶液pH值 的计算方法、运用工作曲线法和标准加入法进行 离子活度的计算
本章主要内容 • 电位分析法基本原理 • 离子选择性电极与膜电位 • 离子选择性电极的选择性 • 离子选择性电极的种类与性能 • 测定离子活（浓）度的方法 • 电位滴定法 • 重点掌握电位分析法的基本原理，掌握溶液pH值 的计算方法、运用工作曲线法和标准加入法进行 离子活度的计算
Classification of electroanalytical methods • Based on the quantitative relationship between some physical chemical properties of the chemical cell and concentration of the solute • Use the mutation of the physical chemical properties as indicating method of a titration reaction end-point, that is, electrical volumetry • Transfer the analyte into solid state (metal or oxide), then weigh mass of these metal or oxide deposited to ascertain amount of the analyte, that is electrogravimetry
Classification of electroanalytical methods • Based on the quantitative relationship between some physical chemical properties of the chemical cell and concentration of the solute • Use the mutation of the physical chemical properties as indicating method of a titration reaction end-point, that is, electrical volumetry • Transfer the analyte into solid state (metal or oxide), then weigh mass of these metal or oxide deposited to ascertain amount of the analyte, that is electrogravimetry
Classification of electroanalytical methods
Classification of electroanalytical methods
§4-2 Principle of potentiometry • 电位分析法的实质是通过在零电流条 件下测定两电极间的电位差(即所构成 原电他的电动势) 进行分析测定。包括 电位测定法和电位滴定法。 Theoretical basis of potentiometric analysis is Nernst equation: E = EOx/Red + ln RT nF aOx aRed For metal base electrode, aRed = 1, hence, E = EM n+/M + ln RT nF aM n+
§4-2 Principle of potentiometry • 电位分析法的实质是通过在零电流条 件下测定两电极间的电位差(即所构成 原电他的电动势) 进行分析测定。包括 电位测定法和电位滴定法。 Theoretical basis of potentiometric analysis is Nernst equation: E = EOx/Red + ln RT nF aOx aRed For metal base electrode, aRed = 1, hence, E = EM n+/M + ln RT nF aM n+