Determination of Trace Lead in Surface Water by Microwave Plasma Emission Spectrometry with Ion imprinted Polymer Microspheres Solid Phase Extraction

KeyWord:ion imprinting solid phase extraction£¨IISPE£©  Pickering emulsion polymerization  lead  MP-AES  surface water

Abstract:

      A method was developed for the determination of trace Pb2+in surface water by microwave plasma atomic emission spectrometry with ion imprinted polymer solid phase extraction£¨IISPE/MP-AES£©.The ion imprinted polymer microspheres£¨IIPMs£© were synthesized via Pickering emulsion polymerization with Pb2+as template ions.Results showed that IIPMs exhibited a porous structure with an average particle diameter of 26ª±6 ¦Ìm£¬which resulted in their high selectivity and monolayer adsorption toward Pb2+.The solid phase extraction process was conducted with IIPMs as sorbent and 5%nitric acid as elution solvent.Factors affecting preconcentration such as pH value£¬cycle number£¬concentration and adding amount of Pb2+were investigated.Under the optimized experimental conditions£¬the limits of detection£¨LODs£© of the method were 0ª±26 ¦Ìg/L£¬and the spiked recoveries were in the range of 92ª±4%-98ª±8%with relative standard deviations£¨RSDs£© not more than 4ª±1%.The combination of IIPMs-SPE and MP-AES was successfully applied in the determination of trace lead in surface water.