Routine water pH measurement
introduce
This method provides a method for measuring the pH value of conventional water, using the 8157BNUMD Super Ross three-in-one composite pH electrode with a built-in temperature probe, which can be widely used in laboratory and field measurements of the pH value of conventional water samples.
Preparation of Calibration Standards
Note: Select a two-point calibration standard solution covering the pH value of the sample. The first point generally chooses a pH7.00 buffer, and the second point chooses a buffer close to the pH value of the sample to be tested (such as pH4.01 or pH10.01).
1. Use a graduated cylinder to measure 100mL of pH7.00 buffer and pour it into a 150mL beaker;
2. Use a graduated cylinder to measure 100mL of pH4.01 or pH10.01 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 ROSSTM filling solution 810007. To maintain proper permeation rates, the fill fluid level should 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. Place the electrode on the electrode holder for 15 minutes to allow the liquid junction to be effectively wetted. Do not leave the electrode dry after the liquid junction is wet.
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 more than two hours.
