The mercury-mercurous sulfate reference electrode（Hg/Hg2SO4） is mainly used in acidic solutions. This reference electrode is a suitable choice for neutral or acidic systems where it is necessary to avoid chloride ion pollution. It is an electrode composed of metallic mercury, mercurous sulfate and saturated K2SO4 solution, and its electrode potential is 0.652V (25°C).

Specification:
tube diameter: 5.75 mm
effective length: 50 mm
liquid junction core: microporous ceramic filter core
filling solution: Saturated K2SO4
potential stability: <5 mV
operating temperature: 0-40 deg C

Notes:

1.When the mercury sulfate electrode is used, the rubber stopper of the liquid port should be removed first, so that the salt bridge solution can hold a certain flow rate by gravity and the path of the measured solution.

2.There can be no bubbles in the potassium sulfate solution in the electrode to prevent circuit breaking, and a few crystals should be retained in the solution to ensure the saturation of the potassium sulfate solution.

3.When measuring, the salt bridge solution surface of the mercury sulfate electrode should be a certain distance higher than the surface of the measured solution to prevent the measured solution from diffusing to the mercury sulfate electrode.

4.Because the potential of the mercurous sulfate electrode has a large negative temperature coefficient and thermal hysteresis, the temperature fluctuation of the mercury sulfate electrode should be prevented as much as possible during measurement. Accurate measurement should be made by keeping the mercuryous sulfate electrode at a constant temperature.To overcome this shortcoming, a long salt bridge tube is usually added to the lower part of the Hg/Hg2SO4 electrode, so that the Hg/Hg2SO4 electrode is at room temperature, and the temperature of the salt bridge solution is the same as the solution to be tested.

5.If it is found that the measured solution is contaminated with the inside of the mercury sulfate electrode solution, the scale should be scraped off or the inner liquid should be replaced from time to time to maintain accurate measurement.

6.Recommended temperature for electrode: ≤40℃.

7.When the electrode is attached with potassium sulfate solution or crystal, potassium sulfate should be removed at any time.

8.The reference electrode cannot be cleaned under ultrasound.

Different research systems can choose different reference electrodes:
Neutral system------saturated calomel electrode or Ag/AgCl reference electrode
Alkaline system-----Hg/HgO reference electrode
Acidic system-------Hg/Hg2SO4 reference electrode
Non-aqueous system--Non aqueous Ag+ reference electrode

Product Includes:
1 * Hg/Hg2SO4 reference electrode with gold-plated pin
1 * cap
1 * fluorine rubber O-ring