Structure and Principle of Automatic Potentiometric Titrator

The automatic potentiometric titrator is a common analytical instrument designed for volumetric analysis based on the principle of potentiometry, which uses potentiometric titration to determine the end point of titration by measuring potential changes during the titration process. It can be used for the titration of colored or turbid solutions, and also for dilute test solutions or titration reaction that is not complete. With high sensitivity and accuracy, it can realize automation and continuous measurement, so it has a wide range of application.
 
The automatic potentiometric titrator has a battery composed of an indicator electrode, a reference electrode and test solution. During the potentiometric titration process, a chemical reaction occurs in the solution with the addition of the titrant, and the concentration of the measured ion changes continuously, which causes the potential between the indicator electrode and the reference electrode to change. Near the equivalent point, there is a sudden jump in the potential between the two electrodes. The titration end point can be obtained by using this sudden change potential in combination with the calculation program inside the instrument.
 
The automatic potentiometric titrator is mainly composed of a control processor (host), an exchange device (exchange unit) and a stirrer. It can perform different types of analytical titrations with corresponding indicator electrodes. According to the different types of titration reactions, it can be divided into acid-base titration, precipitation titration, complexometric titration and redox titration. The electrodes selected for different test methods are also different.
 
The automatic potentiometric titrator is a general basic equipment in the laboratory and is widely used. It can be used in food, drug inspection, disease control, commodity inspection, water treatment, petroleum, chemical, marine, electric power, environmental protection, new energy, teaching, scientific research and other related fields. For example,  hardness measurement (Ca2+/Mg2+), chloride ion content measurement, pH measurement, acid/alkali reaction capacity (p- /m- value), etc. in water quality analysis; the acid content and chloride ion content in food, Citric acid in beverages, sugar content in fruit juice, sodium glutamate content in seasoning, amino acid content in oral liquid, etc. in the food industry. The automatic potential nitrogen analyzer should be used under the conditions of an ambient temperature of 5℃~35℃ and a relative humidity of not more than 80%.