pH electrode

The core theory of pH electrode measurement is the Nernst equation. The sensor used in potentiometric analysis is called a primary battery. A primary battery is a system that converts chemical reaction energy into electrical energy. The voltage of this battery is called electromotive force (EMF). This electromotive force (EMF) is composed of two and a half cells. One of the half cells is called a measuring sensor, and its potential is related to a specific ion activity; The other half cell is a reference half cell, commonly referred to as a reference sensor, which is typically connected to the measuring solution and to the measuring instrument.