Direct potentiometry

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The direct potential method is Potentiometry One of them is to determine the ion concentration measured according to the measured potential value.

Chinese name: Direct potentiometry
Foreign name: Direct potential method

Discipline: Electronic Engineering
Field: Engineering technology

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brief introduction

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The direct potential method is to measure Battery electromotive force To determine the potential of the indicator electrode, and then Nernst equation Calculate the content of the measured substance from the measured electrode potential value^[1] 。

Potentiometry

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Potentiometry (POTENTII OMETRY is based on measure Based on the electromotive force of the primary cell, the activity or concentration of the substance to be measured is measured according to the quantitative relationship between the electromotive force and the activity (or concentration) of a certain ion in the solution (Nernst equation) Electrochemical analysis 。 It uses the liquid to be tested as the chemical battery electrolyte solution Insert two electrodes, one is the indicator electrode (usually used as the negative electrode) whose electrode potential changes with the activity or concentration of the ion to be measured in the test solution to indicate the activity (or concentration) of the ion to be measured, and the other is the reference electrode (usually used as the positive electrode) whose electrode potential is basically stable at a certain temperature and does not change with the activity of the ion to be measured in the test solution, Measure the electromotive force of the battery to determine the amount of the substance to be tested.

Potentiometry

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Use one Indicator electrode And a Reference electrode , or use two indicator electrodes to form a battery with the test solution, and then analyze according to the change of the electromotive force of the battery or the change of the potential of the indicator electrode, which is called potentiometry^[2] 。

Coulometric analysis

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determination electrolysis Power consumed in the process, press Faraday's law The analytical method for calculating the content of the substance to be measured is called Coulometric analysis 。 Coulometric analysis can also be divided into Coulometric analysis of control potential And constant current Coulometric titration 。

Voltammetry

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utilize electrolysis Current voltage relationship curve measured in the process of（ Volt ampere curve ）The method of analysis is called Voltammetry 。

Polarographic analysis

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Yes Dropping mercury electrode Of Voltammetry call Polarographic analysis 。^[3]

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