introduce
This method provides a method for measuring the pH value of conventional water, using a 9157BNMD three-in-one composite pH electrode with a built-in temperature probe, which can be widely used in the laboratory measurement of the pH value of conventional water samples.
Preparation of Calibration Standards
1. Use a graduated cylinder to measure 100mL of pH7.00 buffer and pour it into a 150mL beaker;
2. Use a measuring cylinder to measure 100mL of pH4.01 buffer and pour it into a 150mL beaker.
sample preparation
1. Measure 100mL sample with a graduated cylinder and pour it into a 150mL beaker.
2. If you need to measure other samples, please repeat the above steps.
electrode storage
In order to ensure fast response of the electrode and smooth flow of the liquid junction, do not allow the sensitive glass bulb and liquid junction to dry out.
Short-term storage of electrodes (less than one week)
Soak the electrode in 910001pH electrode storage solution. If there is no such storage solution, please add 1g KCl to 200ml pH7 buffer solution as a temporary replacement.
Long-term storage of electrodes (more than one week)
There should be a proper amount of filling liquid in the electrode, and the filling hole should be plugged tightly with a plug. Put a few drops of 910001 electrode storage solution into the electrode protective cap, and then gently cover the electrode to protect the liquid junction and sensitive glass bulb. When using the electrode again, precondition it as if it were a new electrode.
Equipment preparation Electrode preparation
1. Gently remove the black glass bulb protective sleeve from the electrode and put it away for later use.
2. Clean the white deposited salt on the outside of the electrode with deionized water.
3. Open the plug of the electrode filling hole and add filling solution 900011. To maintain proper permeation rates, the level of the fill fluid needs to submerge the end of the spiral glass tube and be at least 1 inch (2.5 cm) above the sample level. The liquid filling hole should be opened when the electrode is in use.
4. Press (do not twist) the electrode cap to release the filling liquid in the electrode, fully wet the liquid junction, and then replenish the electrode filling liquid.
5. Gently shake the electrode, (just like shaking a thermometer), to remove the air bubbles in the electrode.
6. Soak the electrode in pH electrode storage solution 910001 for one hour. If there is no electrode storage solution, 1g KCl can be added to 200mL pH7 buffer as a temporary electrode storage solution.
