Silicon carbide nanoparticles as an adsorbent for solid phase extraction of lead and determination by flame atomic absorption spectrometry

摘要

Silicon carbide nanoparticles were applied as a new solid phase adsorbent for preconcentration of lead ions. Pb(II) ions are adsorbed on silicon carbide nanoparticles, eluted with nitric acid and determined by flame atomic absorption spectrometry. The solid phase extraction conditions were optimized. The calibration graph was linear in the range of 2-150 ngmL~(-1) (r= 0.9995) with a detection limit of 0.4ngmL~(-1).'The relative standard deviation for eight measurements of 20 ngmL~(-1) of Pb(II) was 1.3%. The adsorption capacity was 156.2 mg g~(-1)of Pb(II). The method was applied to determination of Pb(II) in different samples.