Synthesis and application of nano-pore size ion imprinted polymer for solid phase extraction and determination of zinc in different matrices

摘要

A new Zn(Ⅱ) ion imprinted polymer (ⅡP) has been synthesized. The imprinted Zn(Ⅱ) ions were completely removed by leaching the ⅡP with HC1 (6 mol L~(-1)) and were characterized by FT-IR and SEM. The maximum sorption capacity of ⅡP for Zn(Ⅱ) ions was found to be 2.73 mg g~(-1). Variables affecting the ⅡP solid phase extraction were optimized by MultiSimplex and univariable methods. Sample volumes of 60 and 250 mL resulted in a preconcentration factor of 28 and 118, respectively. Precision (n = 7) at 30 ug L~(-1) and 5 ug L~(-1) level for 60 and 250 mL samples were found to be 2.5% and 3.4%. With preconcentration of 60 and 250 mL of samples, detection limits of 1.02 ug L~(-1) and 0.48 ug L~(-1) were determined. The method was successfully applied to the determination of zinc in various natural water samples and cereal samples and certified references samples.