Dakova Ivanka, Karadjova Irina, Ivanov Ivo, Georgieva Ventsislava, Evtimova Bisera, Georgiev George
Department of Chemistry, Sofia University, Sofia, Bulgaria.
Anal Chim Acta. 2007 Feb 12;584(1):196-203. doi: 10.1016/j.aca.2006.10.050. Epub 2006 Nov 7.
Ion-imprinted polymer (IIP) particles are prepared by copolymerization of methacrylic acid as monomer, trimethylolpropane trimethacrylate as crosslinking agent and 2,2'-azo-bis-isobutyronitrile as initiator in the presence of Cu(II), a Cu(II)-4-(2-pyridylazo)resorcinol (Cu(II)-PAR) complex, and PAR only. A batch procedure is used for the determination of the characteristics of the Cu(II) solid phase extraction from the IIP produced. The results obtained show that the Cu(II)-PAR IIP has the greatest adsorption capacity (37.4 micromol g(-1) of dry copolymer) among the IIPs investigated. The optimal pH value for the quantitative preconcentration is 7, and full desorption is achieved by 1 M HNO(3). The selectivity coefficients (S(Cu/Me)) for Me=Ni(II), Co(II) are 45.0 and 38.5, respectively. It is established that Cu(II)-PAR IIPs can be used repeatedly without a considerable adsorption capacity loss. The determination of Cu(II) ions in seawater shows that the interfering matrix does not influence the preconcentration and selectivity values of the Cu(II)-PAR IIPs. The detection and quantification limits are 0.001 micromol L(-1) (3sigma) and 0.003 micromol L(-1) (6sigma), respectively.
离子印迹聚合物（IIP）颗粒是在铜（II）、铜（II）-4-（2-吡啶偶氮）间苯二酚（铜（II）-PAR）络合物以及仅PAR存在的情况下，通过甲基丙烯酸作为单体、三羟甲基丙烷三甲基丙烯酸酯作为交联剂、2,2'-偶氮二异丁腈作为引发剂进行共聚制备的。采用分批程序来测定从所制备的IIP中进行铜（II）固相萃取的特性。所得结果表明，在所研究的IIP中，铜（II）-PAR IIP具有最大的吸附容量（干共聚物为37.4微摩尔克⁻¹）。定量预富集的最佳pH值为7，通过1 M硝酸可实现完全解吸。对于Me = Ni（II）、Co（II）的选择性系数（S（Cu/Me））分别为45.0和38.5。已确定铜（II）-PAR IIP可以重复使用而不会有明显的吸附容量损失。海水中铜（II）离子的测定表明，干扰基质不会影响铜（II）-PAR IIP的预富集和选择性值。检测限和定量限分别为0.001微摩尔升⁻¹（3σ）和0.003微摩尔升⁻¹（6σ）。
