Saraji Mohammad, Yousefi Hamideh
Department of Chemistry, Isfahan University of Technology, Isfahan, Iran.
J Hazard Mater. 2009 Aug 15;167(1-3):1152-7. doi: 10.1016/j.jhazmat.2009.01.111. Epub 2009 Feb 6.
A new ion-imprinted polymer (IIP) material was synthesized by copolymerization of 4-vinylpyridine as monomer, ethyleneglycoldimethacrylate as crosslinking agent and 2,2'-azobis-sobutyronitrile as initiator in the presence of Ni-dithizone complex. The IIP was used as sorbent in a solid-phase extraction column. The effects of sampling volume, elution conditions, sample pH and sample flow rate on the extraction of Ni ions form water samples were studied. The maximum adsorption capacity and the relative selectivity coefficients of imprinted polymer for Ni(II)/Co(II), Ni(II)/Cu(II) and Ni(II)/Cd(II) were calculated. Compared with non-imprinted polymer particles, the IIP had higher selectivity for Ni(II). The relative selectivity factor (alpha(r)) values of Ni(II)/Co(II), Ni(II)/Cu(II) and Ni(II)/Cd(II) were 21.6, 54.3, and 22.7, respectively, which are greater than 1. The relative standard deviation of the five replicate determinations of Ni(II) was 3.4%. The detection limit for 150 mL of sample was 1.6 microg L(-1) using flame atomic absorption spectrometry. The developed method was successfully applied to the determination of trace nickel in water samples with satisfactory results.
以4-乙烯基吡啶为单体、乙二醇二甲基丙烯酸酯为交联剂、2,2'-偶氮二异丁腈为引发剂，在镍-双硫腙配合物存在下，通过共聚反应合成了一种新型离子印迹聚合物（IIP）材料。该IIP用作固相萃取柱中的吸附剂。研究了进样体积、洗脱条件、样品pH值和样品流速对水样中镍离子萃取的影响。计算了印迹聚合物对Ni(II)/Co(II)、Ni(II)/Cu(II)和Ni(II)/Cd(II)的最大吸附容量和相对选择性系数。与非印迹聚合物颗粒相比，IIP对Ni(II)具有更高的选择性。Ni(II)/Co(II)、Ni(II)/Cu(II)和Ni(II)/Cd(II)的相对选择性因子（α(r)）值分别为21.6、54.3和22.7，均大于1。Ni(II)五次重复测定的相对标准偏差为3.4%。采用火焰原子吸收光谱法，150 mL样品的检测限为1.6 μg L(-1)。所建立的方法成功应用于水样中痕量镍的测定，结果令人满意。
