Abstract

SOLID PHASE EXTRACTION OF Pb(II) USING ?-CYCLODEXTRIN POLYMER MODIFIED WITH 1-(2-PYRIDYLAZO)-2-NAPHTHOL (PAN)

Sandeep Jaggi* and Usha Gupta

ABSTRACT

β-Cyclodextrin, a biomolecule was crosslinked with 1,4-butanedioldiglycidyl ether and the modified β-Cyclodextrin was modified with 1-(2-pyridylazo)-2-naphthol (PAN) through inclusion phenomenon. The new sorbent was applied for solid phase extraction of Pb(II) from different environmental samples prior to determination by UV-Vis spectrophotometry(UV-Vis). The modified polymer was characterized by elemental analysis, FTIR and SEM studies. The experimental conditions for Functionalization of crosslinked β-cyclodextrin polymer and separation/pre-concentration of target metal ion were optimized and the interference of commonly coexisting ions was examined. The sorbed Pb(II) was eluted using 5 mL of 2M HCl. According to definition of IUPAC, the detection limit (3σ) of this method is 0.003ng/mL and a preconcentration factor of 80. The recovery values were ≥95% and relative standard deviation was 0.5%. The developed method was successfully applied for the determination of trace Pb(II) in different water and food samples.

Keywords: ?-Cyclodextrin polymer; Pb(II); preconcentration; 1-(2-pyridylazo)-2-naphthol.