Potential analysis method (1)

4.

Insert the indicator electrode and the reference electrode in the measured solution, and measure the potential difference between the two electrodes to determine the content of a certain component in the solution is called potentiometric analysis

The direct potential method is to directly measure the ion concentration according to the functional relationship between the potential difference between the indicator electrode and the reference electrode and the measured ion concentration

In the potential analysis method, the potential of the electrode must be accurately measured, and the concentration of the ion to be measured must be obtained based on the measured potential

(1) Indicator electrode

1) Metal electrodes

2) Ion selective electrode

3) Glass electrodes

The structure of the glass electrode is shown in Figure 4.

Figure 4.

By changing the composition of the glass film, an electrode that selectively responds to Li ⁺ , Na ⁺ , and K ⁺ plasma can also be made , and the concentration of Li ⁺ , Na ⁺ , and K ⁺ in the solution can be measured respectively

Among them, the most widely used electrode is the primary electrode, which is matched with the sodium meter to determine the content of Na ⁺ ions in boiler water

4) Standard hydrogen electrode