A novel chromium selective electrode based on surfactant-modified Iranian clinoptilolite nanoparticles

Abstract

A novel modified hexadecyltrimethyl ammonium surfactant-modified nanoclinoptilolite electrode was constructed for the potentiometric determination of dichromate and showed a Nernstian response in the concentration range of 7.0 × 10⁻⁶ − 1.0 × 10⁻¹ M. A Nernstian slope of 29.7 ± 0.9 m V per decade of dichromate concentration and a detection limit of 3.1 × 10⁻⁷ M dichromate were obtained for the proposed electrode. The proposed electrode exhibited a rapid response about 10 s over a period of 2 months with good reproducibility and also without any considerable divergence in potential response. It was also applied as an indicator electrode in the potentiometric titration of dichromate.

Keywords:

• Ion-selective electrode
• Dichromate
• Surfactant-modified zeolite
• Nanoparticles
• Clinoptilolite