Sulfide Ion-Selective Electrode as Potentiometric Sensor for Lead(II) Ion in Aqueous and Nonaqueous Medium

Abstract

The possibilities of a sulfide ion-selective electrode (SISE) for the determination of lead(II) at different pH values is presented. Potential - time curves recorded after addition of lead(II) in sulfide solution constitute the primary data in this study. The influence of the pH and ethanol in ethanol-aqueous mixtures on the behaviour of a SISE and on formation of PbS was investigated. A relationship between the initial rate of decrease of the sulfide concentration in test solution and various amounts of lead(II) is discussed. The results of measurements showed the possibility of determining up to micromole quantities of lead(II).

Key Words:

• ion-selective electrode
• sulfide
• lead(II)
• mixed aqueous solvents
• effect of pH
• buffer solution