Application of a metal ion-imprinted polymer based on salen-Cu complex to flow injection preconcentration and FAAS determination of copper.

摘要: Abstract A new Cu(II)-imprinted polymer (Cu-IIP) for preconcentration of copper by liquid–solid extraction via flow injection technique has been proposed. Cu-IIP was obtained copolymerization salen–Cu(II) complex with styrene and divinylbenzene using suspension polymerization technique. Granules fraction 60–80 μm in diameter used as a microcolumn packing. Cu(II) sorption proved to be the most effective from solutions pH 7, whereas similar elution effectiveness observed when applying eluents hydrochloric or nitric acid concentration range 0.5–10% (v/v). The system exhibited good long-term stability resistance. Batch sorbent capacity found 0.11 mmol g −1 dry polymer. Enrichment factor (EF) 30 s loading time 16. Preconcentration potentially interfering metal ions is strongly dependent. Examination presence Pb(II), Cd(II), Zn(II) Ag(I) showed significant influence cadmium zinc only that interferent concentrations above 0.5 mg L (Cu-IIP mass ca. 35 mg). interference effect reduced increase. Fe(III) Mn(II) ions, present treated tap water relatively high concentrations, did not interfere. Effective adjusting loaded solution on-line mode, diluted Clark–Lubs buffering solution, allowed accurate determination (compared graphite furnace atomic absorption spectrometry, GFAAS) standard addition combination calibration method.