In this thesis, two new sorbents based on ion imprinting are prepared for selective extraction and preconcentration of nickel (II) in aqueous samples. Both cases involve formation of complexes of nickel with nonselective ligands following trapping of complexes in the sorbent matrix through non-covalent approach. The conditions of quantitative recovery of nickel ion such as acidity of aqueous phase, variables of flowing system, elution conditions and interfering ions were studied. The amount of metal ion in eluent was determined by flame atomic absorption spectrometry. In the first section, nickel ion imprinted polymer (IIP) was synthesized by formation of complex of nickel ion (Ni 2+ ) with dithizone and following polymerizing of 4-vinylpyridine as functional monomer and ethyleneglycoldimethacrylate as crosslinking monomer using 2,2'-azobis(2-methyl-propyonitrile) as initiator. Control polymer was prepared under identical conditions without the use of nickel imprint ion. Then various parameters that affect on the preconcentration of nickel ion were optimized using an extraction column. The optimal pH value for the quantitative preconcentration is 8, and full desorption is achieved by 1M HCl. The recovery percent and retention capacity of IIP for Ni 2+ was found to be 95% and 1.3 mg g -1 , respectively. The selectivity coefficients (? Ni/Me ) for Cu(II), Co(II), Cd(II) are 54.3, 21.6 and 22.7, respectively. The precision (RSD) of the method using 6 replicate extractions of 30 µg L -1 Ni 2+ was 3.4%. This metal ion imprinted polymer solid-phase extraction preconcentration procedure showed a linear calibration curve within concentration range from 5 to 100 µg L ? 1 . The detection limit is 1.6 µg L -1 (3?). The proposed IIP was tested for determination of nickel ion in river water samples.
