A rotating tungsten disc electrode in concentrated strong alkaline solutions: An electroanalytical aspect

► Tungsten rotating disc electrode in 10−3-10−1 M KOH solutions was studied. ► Limiting anodic current depends linearly on the concentration of OH− ions. ► Limiting anodic current is insensitive to potential changes within several volts. ► Tungsten rotating disc may serve as robust and accurate sensor of OH− ions.