Salahaddin hajizadeh - Department of Chemistry, Faculty of Science, Urmia University, Urmia, Iran
Khalil Farhadi - Department of Chemistry, Faculty of Science, Urmia University, Urmia, Iran
Reza Emamali- Sabzi - Department of Chemistry, Faculty of Science, Urmia University, Urmia, Iran

We report here a simple, cost effective, rapid, sensitive and selective colorimetric sensor for the detection of cyanide using silver nanoparticles. The sensitivity and selectivity was also investigated. We suggest that cyanide can bound to the Ag NPs surface, and moved SDS away from the silver surface. As a result, it is expected that a redox reaction can occurs between silver and O2 of air .There is a linear rela(onship (y=7644.1x+0.0099, R2 =0.9968) between the absorbance intensity of the Ag NPS and concentra(on of CN- ion over the range from 16.7μMto 133μM at the absorp(on of 394nm. The proposed has been successfully used for the determina(on of cyanide in different water samples.