Hg/Hg2SO4 Reference Electrode

Product Description

The Hg/Hg2SO4 reference electrode is preferred when chloride must be excluded (e.g., lead-acid environments, chloride-sensitive corrosion work). It uses a mercury/mercurous sulphate couple with sulphate electrolyte (commonly saturated K2SO4 or defined H2SO4), providing a stable, high potential relative to NHE. Reported values at 25 °C range around +0.62–0.66 V, depending on the exact sulphate electrolyte and concentration. The glass body with porous frit offers steady junction flow; routine care includes maintaining the sulphate fill, avoiding bubbles, and periodic verification against a standard. Note: mercury handling and disposal procedures apply—consult your safety policy.