Walas Stanisław, Tobiasz Anna, Gawin Marta, Trzewik Bartosz, Strojny Marcin, Mrowiec Halina
Jagiellonian University, Faculty of Chemistry, ul. Ingardena 3, 30-060 Kraków, Poland.
Talanta. 2008 Jun 30;76(1):96-101. doi: 10.1016/j.talanta.2008.02.008. Epub 2008 Mar 10.
A new Cu(II)-imprinted polymer (Cu-IIP) for preconcentration of copper by liquid-solid extraction via flow injection technique has been proposed. Cu-IIP was obtained by copolymerization of salen-Cu(II) complex with styrene and divinylbenzene using suspension polymerization technique. Granules fraction of 60-80 microm in diameter was used as a microcolumn packing. Cu(II) sorption was proved to be the most effective from solutions of pH 7, whereas similar elution effectiveness was observed when applying as eluents hydrochloric or nitric acid in the concentration range of 0.5-10% (v/v). The system exhibited good long-term stability and acid resistance. Batch sorbent capacity was found to be 0.11 mmol g(-1) of a dry polymer. Enrichment factor (EF) for 30 s loading time was 16. Preconcentration of Cu(II) and potentially interfering metal ions is strongly pH dependent. Examination of Cu(II) sorption in the presence of Pb(II), Cd(II), Zn(II) and Ag(I) showed significant influence of cadmium and zinc ions only and that was for the interferent concentrations above 0.5 mg L(-1) (Cu-IIP mass of ca. 35 mg). The interference effect was reduced with the sorbent mass increase. Fe(III) and Mn(II) ions, present in treated tap water in relatively high concentrations, did not interfere. Effective pH adjusting of the loaded solution in on-line mode, when applying diluted Clark-Lubs buffering solution, allowed accurate copper determination in tap water (compared to graphite furnace atomic absorption spectrometry, GFAAS) using standard addition or combination calibration method.
本文提出了一种新型的铜（II）印迹聚合物（Cu-IIP），用于通过流动注射技术进行液固萃取预富集铜。采用悬浮聚合法，通过将席夫碱-Cu（II）配合物与苯乙烯和二乙烯基苯共聚得到Cu-IIP。直径为60-80微米的颗粒级分用作微柱填料。结果表明，在pH 7的溶液中，Cu（II）的吸附效果最佳；而当使用浓度范围为0.5-10%（v/v）的盐酸或硝酸作为洗脱剂时，观察到类似的洗脱效果。该体系具有良好的长期稳定性和耐酸性。发现该批吸附剂对干燥聚合物的吸附容量为0.11 mmol g(-1)。30 s加载时间的富集因子（EF）为16。Cu（II）和潜在干扰金属离子的预富集强烈依赖于pH值。在Pb（II）、Cd（II）、Zn（II）和Ag（I）存在下对Cu（II）吸附的研究表明，仅镉和锌离子有显著影响，且干扰物浓度高于0.5 mg L(-1)（Cu-IIP质量约为35 mg）。随着吸附剂质量的增加，干扰效应降低。处理后的自来水中相对高浓度存在的Fe（III）和Mn（II）离子不产生干扰。当应用稀释的克拉克-卢布斯缓冲溶液在线模式下对加载溶液进行有效pH调节时，使用标准加入法或组合校准法可准确测定自来水中的铜（与石墨炉原子吸收光谱法，GFAAS相比）。
