Application of modified multi-walled carbon nanotubes for the simultaneous preconcentration of Bi, Cu, Cd and Pb in various standard and real samples

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.

کلیدواژه ها:

Bismuth ، Copper ، Cadmium ، Lead ، Multiwalled carbon nanotube