Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan, 430072, China.
Mikrochim Acta. 2019 Nov 14;186(12):775. doi: 10.1007/s00604-019-3819-5.
Double imprinted polymer coated magnetic nanoparticles were fabricated with 4-nm size ZnO nanoparticles acting as the sacrifice templates, which were co-imprinted with template Pb(II) ions. After template removal, abundant transfer pores derived from ZnO nanoparticles were left around the selective adsorption sites derived from Pb(II) ions. The magnetic sorbent exhibit good selectivity, rapid adsorption kinetic and large adsorption capacity for Pb(II). They were used to extract trace Pb(II) followed by graphite furnace atomic absorption spectrometry detection. After the optimization of extraction conditions, following merits are found: (a) rapid extraction (10 min), (b) high preconcentration factor (100 fold), (c) sensitive detection with the detection limit of 9.4 ng·L, and (d) low relative standard deviation (6.9%) at a level of 50 ng·L of Pb(II) analyzed 7 times. The method was employed in extraction and quantification of trace Pb in biological and environmental samples with satisfactory recoveries of 87.5-104%. Graphical abstractDouble imprinted polymer coated magnetic nanoparticles (MNPs@DIP) were fabricated and used for extraction of Pb(II) followed by graphite furnace atomic absorption spectrometry (GFAAS) detection. The method was successfully applied for the determination of Pb in environmental and biological samples.
采用 4nm 尺寸的 ZnO 纳米粒子作为牺牲模板，制备了双印迹聚合物涂层磁性纳米粒子，其共同印迹了模板 Pb(II)离子。模板去除后，大量源自 ZnO 纳米粒子的传递孔会留在源自 Pb(II)离子的选择性吸附位点周围。该磁性吸附剂对 Pb(II)具有良好的选择性、快速的吸附动力学和较大的吸附容量。它们用于提取痕量 Pb(II)，然后通过石墨炉原子吸收光谱法进行检测。在优化了提取条件后，发现了以下优点：(a)快速提取(10 分钟)；(b)高预浓缩因子(100 倍)；(c)检测灵敏度高，检测限为 9.4ng·L；(d)在 50ng·L 的 Pb(II)水平下分析 7 次，相对标准偏差为 6.9%。该方法用于提取和定量生物和环境样品中的痕量 Pb，回收率为 87.5-104%。
