Analysis of the main points in the measurement of potentiometric titrator
The potentiometric titrator can be used for various types of potentiometric titration. The user can insert the electrode jack of the rear panel according to different electrodes. If some electrodes cannot be directly inserted into the Q9 jack, the Q9 plug provided by the instrument can be used. Hold the electrode tip with a crocodile.
A. Install the titration device and force the silicone tube at both ends of the solenoid valve into the joint of the burette and the drip tube.
B. Insert the solenoid valve into the socket at the back of the instrument and add a standard solution to the burette.
C. Press the “Fast Drop†button to adjust the solenoid valve screw to make the standard solution flow down and drive away all the air bubbles in the liquid path.
D. Press the “slow drop†button to adjust the solenoid valve screw so that the slow drop speed is about 0.02ml per drop. E. Refill the standard solution and press the short drop button to adjust the standard solution in the burette to zero scale.
F. Select the switch to set the “preset†file, adjust the preset potentiometer to the end point potential value of the solution dripped by the user. The mv value and the PH value are common. If the end point potential is -800mv, adjust the end point potentiometer to make the number appear as -800, if the end potential is 8.5PH, adjust the end potentiometer to make the number 850.
G. After the end point potential is preset, the selector switch sets the mv or PH position according to the requirements of use. At this time, the “preset†potentiometer cannot be moved any more.
H. When the user performs titration analysis, in order to ensure the titration precision, the titration cannot be advanced to the end point, and the titration time cannot be too long. The instrument is equipped with a long drop control potentiometer, that is, away from the end point potential. When the burette solution is directly passed through the drip, the short drop of the titration solution (about 0.02 ml each time) approaches the end point near the end point, and stops at the end point (±3mv or ±0.03PH), with a delay of about 20 seconds, the potential is not The return indicator light is on and the buzzer sounds.
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