The Use of Silver Ion Buffers for Calibrating a pH₂S Electrode Cell

Abstract

A method to calibrate a pH₂S electrode cell is presented. The cell, which consists of a pH glass half cell and a Ag°, Ag₂S half cell, is calibrated in solutions of known hydrogen ion and silver ion activities. The method allows the determination of the concentration of H₂S gas, dissolved in aqueous solutions, with a precision of about ±30% (p = 0.05). The method is very easy to work with and therefore ideally suited for calibrating pH₂S electrode cells during routine analysis such as wastewater survey studies or aquaculture monitoring programs.

Key Words:

• Hydrogen sulfide
• pH₂S-electrode
• sulfur