Hamid Fazelirad - Department of Chemistry, Shahid Bahonar University of Kerman , Kerman, Iran- Department of Polymer, Science and Research Branch, Islamic Azad University, Yazd, Iran- Young Researchers Society, Shahid Bahonar University of Kerman, Kerman, Iran
Mohammad Ali Taher - Department of Chemistry, Shahid Bahonar University of Kerman , Kerman, Iran

In the present investigation, multi-walled carbon nanotubes impregnated by 1,7,10,16-Tetraoxa-4,13-diazacyclooctadecane were prepared and applied as adsorbent for the simultaneous separation of Bi(III),Cu(II), Cd(II) and Pb(II) ions prior to their determination by electrothermal atomic absorption spectrometry. Thefollowing analytical figures of merit were determined for bismuth, copper, cadmium and lead, respectively:Enrichment factors of 168, 134, 111 and 146, assay precisions of ±4.6, ±4.8, ±5.3 and ±5.0% and detectionlimits of 11.3, 3.7, 0.5 and 0.3 ng L-1. The method was successfully applied for the determination of heavy metalsin environmental, biological and certified reference materials.

Bismuth, Copper, Cadmium, Lead, Multiwalled carbon nanotube