Jagiellonian University, Faculty of Chemistry, Ingardena 3, 30-060 Krakow, Poland.
Talanta. 2010 Jan 15;80(3):1305-10. doi: 10.1016/j.talanta.2009.09.021.
A new cadmium(II)-imprinted polymer based on cadmium(II) 2,2'-{ethane-1,2-diylbis[nitrilo(E)methylylidene]} diphenolate-4-vinylpyridine complex was obtained via suspension polymerization. The beads were used as a minicolumn packing for flow-injection-flame atomic absorption spectrometry (FI-FAAS) determination of cadmium(II) in water samples. Sorption effectiveness was optimal within pH range of 6.6-7.7. Nitric acid, 0.5% (v/v) was used as eluent. Fast cadmium(II) sorption by the proposed material enabled to apply sample flow rates up to 10mLmin(-1) without loss in sorption effectiveness. Enrichment factor (EF), concentration efficiency (CE) and limit of detection (LOD, 3sigma) found for 120-s sorption time were 117, 39.1min(-1) and 0.11microgL(-1), respectively. Sorbent stability was proved for at least 100 preconcentration cycles (RSD=2.9%). When compared to non-imprinted polymer the new Cd(II)-imprinted polymer exhibited improved selectivity towards cadmium(II) against other heavy metal ions, especially Cu(II) and Pb(II), as well as light metal ions. Accuracy of the method was tested for ground water and waste water certified reference materials and fortified water. The method was applied to Cd(II) determination in natural water samples.
一种新型的镉（II）印迹聚合物是通过悬浮聚合得到的，其基于镉（II）2,2'-{乙烷-1,2-二基双[亚氨基（E）甲基]亚苯基}双（4-乙烯基吡啶）配合物。将珠粒用作填充在流动注射-火焰原子吸收光谱法（FI-FAAS）中的微柱，用于测定水样中的镉（II）。在 pH 值为 6.6-7.7 的范围内，吸附效果最佳。采用 0.5%（v/v）的硝酸作为洗脱液。所提出的材料能够快速吸附镉（II），从而可以在不损失吸附效果的情况下，将样品流速提高到 10mLmin(-1)。120 秒吸附时间的富集因子（EF）、浓度效率（CE）和检测限（LOD，3sigma）分别为 117、39.1min(-1)和 0.11microgL(-1)。该吸附剂的稳定性至少可保证 100 次预浓缩循环（RSD=2.9%）。与非印迹聚合物相比，新型的 Cd（II）印迹聚合物对镉（II）表现出更高的选择性，对其他重金属离子（尤其是 Cu（II）和 Pb（II））以及轻金属离子的选择性也有所提高。该方法的准确性已通过地下水和废水标准参考物质以及加标水进行了测试。该方法已应用于天然水样中镉（II）的测定。
