Multivariate optimization of "In capillary-Schiff's base functionalized magnetic nanoparticle based microextraction"...

A novel microextraction procedure based on Schiff's base functionalized magnetic nanoparticles (SBMNPs) has been developed for Pb(+2) extraction. Compared to conventional microextraction systems, the main advantage of proposed procedure is that no volatile/flammable reagents have used and experimental time is also reduced. Schiff's base has been derived from salicylaldehyde and 3-aminopropyltriethoxysilane modified nanoparticles. Extraction of Pb(+2) was carried out in a capillary column containing analyte followed by the addition of SBMNPs and triton X-114 where ionic-liquid "1-Butyl-3-methylimidazolium hexafluorophosphate" was used as an extractant. After extraction; analyte concentration was determined with flame atomic absorption spectrometer through a self made micro-injection system. The SBMNPs were characterized by FTIR and TEM, respectively, demonstrating their distinct core-shell structures. Different experimental parameters were optimized through multivariate strategy. Detection limit, enhancement factor and relative standard deviation obtained with developed procedure were 0.193μgL(-1), 26.3 and 4.01%, respectively. Validity was checked through the recovery experiments and satisfactory results were obtained. In brief the synergistic combination of SBMNPs in column with ionic-liquid resulted in an efficient microextraction procedure for Pb(+2) in real samples.