Knowledge about automatic potentiometric titrator

1 The use of automatic potentiometric titrator BI-ZTU automatic potentiometric titrator is suitable for the potential of the capacity of the analysis indicators, can be used as a special instrument for penicillin detection.

2 automatic potentiometric titrator detection principle Automatic potentiometric titrator using plunger titration method, controlled by the MCU titration process, collecting the dynamic signal electrode. During the titration process, the solution in the titration cell produces different potential changes. When the potential change of △E/ΔV is greater than the threshold value, it is the equivalent point value. When the set condition is met, the instrument goes to the system stop and stops the titration and gives The measurement results.

3 Working principle of automatic potentiometric titrator The working principle of BI-ZTU automatic potentiometric titrator (hereinafter referred to as titrator) is to measure the ion concentration by measuring the change of electrode potential. First select the appropriate indicator electrode and reference electrode, make up a working battery with the tested solution, and then add the titrant. During the titration process, due to a chemical reaction, the concentration of the measured ions constantly changes, and the potential of the indicator electrode changes accordingly. Near the end of the titration, the concentration of the measured ion mutated, causing a jump in the potential of the electrode. Therefore, the endpoint of the titration can be determined based on the sudden change of the electrode potential, and the measurement result is given.

4 The main functions of the automatic potentiometric titrator are divided into titration chemical reaction types: acid-base titration, redox titration, complexometric titration and precipitation titration.

According to different points of titration solvent: aqueous solution titration and non-aqueous titration.

Different points according to the titration method: chemical titration, penicillin content determination, penicillin calibration and penicillin degradation product measurement.

5 Instrument characteristics of automatic potentiometric titrator (1) Titration result is more accurate The titration process acquires a signal of 0.1mV, and the titration minimum feed amount can reach 0.0025ml, which is about 10 times higher than other common titrator feeds.

(2) Full Chinese display, easy operation, higher degree of automation The instrument is displayed in Chinese, the parameter setting is convenient, the instrument automatically titrates, automatically alarms at the end point, and can print the test report results.

(3) Dynamic feed and quantitative feed method The dynamic feed titration method automatically adjusts the feed amount as the potential changes. This method is more effective when used for the titration of penicillin degradation products.

(4) It can be judged that a plurality of equal-point instruments have the exact function equivalent to that of a foreign equivalent potentiometric titration apparatus. It can set 1 to 9 equal points, and has two types of stop-and-stop methods such as equal stop and volume stop.