The ion-selective electrode method is a quantitative analytical method based on the measurement of the electric potential of a cell. The ion-selective electrode and a reference electrode are connected and placed in the electrolyte solution to be measured, which constitutes a measuring cell, and the electrode potential of this cell and the ion concentration to be measured conform to the Nernst equation: Φ = Φ02.303 RT/nF×Lgai. The ion-selective electrode produces different potentials due to the action of lithium-sodium plasma with different activities, which is determined by the ion activity and is proportional to the ion concentration. ion concentration is proportional to the ion concentration. This experiment is from Mudanjiang Medical College, undergraduate 5-year laboratory guide for testing majors.

Operation method

Electrochemical analysis experiment

Principle

The ion-selective electrode method is a quantitative analytical method based on the measurement of the electric potential of a cell. The ion-selective electrode and a reference electrode are connected and placed in the electrolyte solution to be measured, which constitutes a measuring cell, and the electrode potential of this cell and the ion concentration to be measured conform to the Nernst equation: Φ = Φ02.303 RT/nF×Lgai. The ion-selective electrode produces different potentials due to the action of lithium-sodium plasma with different activities, which is determined by the ion activity and is proportional to the ion concentration. ion concentration is proportional.

Move

I. Experimental reagents. Manufacturer's supply

II. Experimental operation:

1. Turn on the apparatus and flush the pipes.

2. Activate the telegraph with activation liquid. The activation time is generally 15-30 minutes.

3. The instrument is automatically calibrated.

4. The measurement results are printed by the microprocessor calculator in the instrument.

5. The electrodes and pipes should be flushed before shutting down the instrument.

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