Bozok University, Faculty of Arts and Sciences, Department of Chemistry, TR-66100 Yozgat, Turkey.
Talanta. 2010 Oct 15;82(5):1974-9. doi: 10.1016/j.talanta.2010.08.023. Epub 2010 Aug 21.
Poly(acrylamidoxime-co-2-acrylamido-2-methylpropane sulfonic acid) (PAMSA) hydrogel was prepared by copolymerization of acrylonitrile and 2-acrylamido-2-methylpropane sulfonic acid as monomer, N,N'-methylenebis(acrylamide) as crosslinking agent and potassium peroxodisulfate as initiator. Amidoximated copolymer network was prepared by the reaction of copolymer network with hydroxylamine hydrochloride. A batch procedure was used for the determination of the characteristics of the U(VI) solid phase extraction from the amidoximated hydrogel. The determination of U(VI) was performed by spectrophotometric method using arsenazo-III as complexing agent. Optimal pH value for the quantitative preconcentration was 3, and full desorption was achieved with 3 mol L(-1) HClO(4). The adsorption process can be well described by the pseudo-second-order kinetic model, and the equilibrium adsorption isotherm was closely fitted with the Langmuir model. A preconcentration factor of 20 and the three sigma detection limit of 2.8 μg L(-1) (n=20) were achieved for uranium(VI) ions. The PAMSA hydrogel was used for separating and preconcentrating the uranyl ion existing in sea water samples, thermal spring water samples and the certified reference materials (TMDA 64; fortified lake water sample).
聚（丙烯酰胺肟-co-2-丙烯酰胺基-2-甲基丙磺酸）（PAMSA）水凝胶是通过丙烯腈和 2-丙烯酰胺基-2-甲基丙磺酸作为单体、N,N'-亚甲基双（丙烯酰胺）作为交联剂和过硫酸钾作为引发剂共聚而成的。通过与羟胺盐酸盐的反应制备了偕胺肟共聚网络。采用批处理程序从偕胺肟水凝胶中测定 U(VI)的固相萃取特性。使用偶氮胂-III 作为络合剂，通过分光光度法测定 U(VI)。定量预浓缩的最佳 pH 值为 3，用 3 mol L(-1) HClO(4)可完全洗脱。吸附过程可用拟二级动力学模型很好地描述，平衡吸附等温线与 Langmuir 模型拟合良好。铀(VI)离子的预浓缩因子为 20，三个标准差检测限为 2.8 μg L(-1)（n=20）。PAMSA 水凝胶用于分离和预浓缩海水中存在的铀酰离子、温泉水样品和认证参考物质（TMDA 64；富湖水样品）。
