Hg/HgO Electrode

Description

Mercury oxide electrode (Hg/HgO) is used in acid meters, ion meters, potentiometric titrators and electrochemical workstations. It is used as a reference electrode in the measurement unit with good potential reproducibility and is suitable for potential measurements in alkaline solutions. 

Technical Specifications

User Manual, Maintenance and Precautions

1. Remove the rubber cap from the liquid junction before using the mercury oxide electrode.
2. Ensure the salt bridge of the mercury oxide electrode is filled with the salt bridge solution during measurement to complete the circuit. The solution level in the salt bridge should be higher than the sample solution to prevent reverse contamination.
3. The salt bridge solution must be free of large air bubbles to maintain an unobstructed electronic measurement circuit. If bubbles are present, hold the electrode firmly and shake it vigorously or tap it upright to release the bubbles.
4. Do not use the mercury oxide electrode in media that react with it. If the use of other concentrations of KOH or reactive media is unavoidable, it is recommended to use a mercuric oxide electrode with double salt bridge to block the effect of the test solution on the core of the electrode.
5. Regularly clean and replace the salt bridge solution. For general cleaning, remove any adhering stains promptly. To replace the salt bridge solution, remove the rubber cap from the injection port at the top of the electrode, extract the old solution, and inject fresh solution.
6. Because the electrode contains toxic mercury oxide and the salt bridge solution is corrosive, please strictly observe the relevant laboratory safety regulations for operation.
7. Avoid prolonged exposure of the electrode to air (more than a few minutes) to prevent the solution in the glass tube from leaking and evaporating, which could impair performance. For short-term storage, immerse the electrode in 1 mol/L KOH solution of the corresponding concentration. For long-term storage, replace the salt bridge solution, seal the electrode, and store it in a dark place.
8. When removing the electrode cap, it is recommended to remove the top and bottom electrode caps at the same time, so as not to cause a difference in air pressure between the inside and outside, which may cause the liquidus flow rate too fast.
9. The recommended operating temperature for electrodes is room temperature, not exceeding 40°C.
10. Reference electrodes, including mercury oxide electrode, should not be cleaned using ultrasonic methods.
11. The salt bridge solution for the mercury oxide electrode is 1 mol/L KOH and can be changed to other concentrations of KOH solution. However, the electrode potential will also change due to the change in concentration and composition of the salt bridge solution, which may also affect the service life of the electrode.

Product Illustration