Determination of Mercury Using a Novel Sonogel‐Carbon 3‐Methylthiophene Electrode

Abstract

A solid Sonogel‐Carbon electrode was modified for the determination of Hg (II) in industrial waste water. 3‐Methylthiophene (3MT), pyrrol, poly‐3‐methylthiophene (P3MT), polypyrrol, and C18 were used for the chemical modification. The obtained composite electrodes were tested for their response to Hg(II); the best results were observed for the 3MT monomer modification with a detection limit of 10⁻² mg · l⁻¹ and 3 weeks lifetime of use. A linear relationship between anodic peak height and concentration inside the range of 0.07–0.42 mg · l⁻¹ was obtained. A study of interferences due to other heavy metal is also included.

Keywords:

• 3‐Methylthiophene
• mercury(II)
• Sonogel‐Carbon electrode

Acknowledgments

The authors acknowledge the financial support of the Junta de Andalucía, throught project AM14/04, and PROTARS II P21/96 (Morocco), as well as the Agencia Española de Cooperación Internacional (AECI), throught a grant to Hanane Zejli.