Determination of cyanide in wastewaters using modified carbon pastec electrod sensor based on Ag+ embedded in a chitosan-coated magnetic nanoparticles

The high toxicity of cyanide and its great variety of uses in industrial processes make it necessary to develop sensitive and selective sensors for its determination in natural and waste waters [1-2]. We demonstrate the fabrication of a highly sensitive, selective, reproducible and reliable amperometric sensor for cyanide ion in aqueous solutions using modified carbon paste electrode based on Ag+ embedded in a chitosan-coated magnetic nanoparticles (Ag/CH/Fe3O4). The Ag/CH/Fe3O4/CPE was used for the determination of cyanide (CN−) in solution (pH 12). The cyclic voltammetry (CV) and square wave voltammetry (SWV) methods were used for the determination of CN−. The linear dynamic range from 0.1 μM to 19.0 μM and a detection limit was found to be 0.02 μM (S/N = 3) by SWV method. Interference studies were performed with typical anions present in natural and waste waters.