Wang Shiru, Wang Sui
Ningbo University, Faculty of Materials Science and Chemical Engineering, Ningbo, 315211, China.
J AOAC Int. 2016 Jan-Feb;99(1):279-86. doi: 10.5740/jaoacint.13-0419. Epub 2016 Jan 28.
A novel monolithic stir-bar for Cd(II) sorption extraction was prepared by ion-imprinting technology and in situ stepwise polymerization of epoxy resin (EP). The condensation product of diethylenetriamine and thiourea (DETATUC) was used as a curing agent, with Cd ions as template ions and polyethylene glycol 1540 as a porogenic agent. The main parameters of the stir-bar sorption extraction-EP-DETATUC material for the extraction and desorption of Cd(II) in aqueous solution were investigated, and inductively coupled plasma-atomic emission spectrometry was performed. The results showed that the monolithic material possessed good permeability and reusability. The maximum adsorption capacity was 136.58 μmol g(-1) at pH 6.0. The optimized conditions were the following: stirring rate at 300 rpm, adsorption time at 40 min, elution media at 0.25 mol L(-1) EDTA, and elution time at 20 min. The accuracy of the method was assessed by spiking two water samples and one plant sewage sample with Cd at two concentration levels. Recoveries of 96-102% were obtained.
通过离子印迹技术和环氧树脂（EP）原位逐步聚合制备了一种用于镉（II）吸附萃取的新型整体式搅拌棒。以二乙烯三胺与硫脲的缩合产物（DETATUC）为固化剂，镉离子为模板离子，聚乙二醇1540为致孔剂。研究了搅拌棒吸附萃取-EP-DETATUC材料对水溶液中镉（II）的萃取和解吸的主要参数，并进行了电感耦合等离子体原子发射光谱分析。结果表明，该整体材料具有良好的渗透性和可重复使用性。在pH 6.0时，最大吸附容量为136.58 μmol g(-1)。优化条件如下：搅拌速率为300 rpm，吸附时间为40 min，洗脱介质为0.25 mol L(-1) EDTA，洗脱时间为20 min。通过向两个水样和一个植物污水样品中添加两个浓度水平的镉来评估该方法的准确性。回收率为96-102%。
