Sølvsølvkloridreferanseelektroden

Sølvsølvkloridreferanseelektroden, often abbreviated as Ag/AgCl electrode, is a type of reference electrode used in electrochemistry. It consists of a silver wire coated with silver chloride (AgCl) immersed in a solution containing chloride ions, typically potassium chloride (KCl). This specific composition provides a stable and reproducible potential, making it a valuable tool for electrochemical measurements.

The operation of the Ag/AgCl electrode relies on the equilibrium between metallic silver, silver chloride, and chloride ions. The silver chloride coating acts as the active material, and its potential is determined by the concentration of chloride ions in the surrounding electrolyte. A saturated solution of KCl is commonly used to ensure a consistent and well-defined chloride ion concentration, thus maintaining a stable electrode potential.

Ag/AgCl electrodes are widely employed in various applications, including potentiometric titrations, pH measurements, corrosion studies, and biosensors. Their popularity stems from their ease of preparation, relatively low cost, and good stability. However, it is important to note that the potential of an Ag/AgCl electrode can be influenced by temperature and the concentration of chloride ions, so proper calibration and handling are crucial for accurate results. They are often used in conjunction with a working electrode and a counter electrode to form a three-electrode electrochemical cell.