Fabrication of porous covalent organic frameworks as selective and advanced adsorbents for the on-line preconcentration of trace elements against the complex sample matrix
Fabrication of porous covalent organic frameworks as selective and advanced adsorbents for the on-line preconcentration of trace elements against the complex sample matrix
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DOI：
10.1016/j.jhazmat.2017.10.013
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发表时间：
2018-02-15
影响因子：
13.6
通讯作者：
Wang, Shuo
中科院分区：
文献类型：
--
作者：
Liu, Jing-Min;Wang, Xing-Zhi;Wang, Shuo
本文首次将具有上级化学稳定性和大比表面积的典型多孔共价有机骨架（COFs）CTpBD作为吸附剂，通过流动注射固相萃取痕量离子，然后进行电感耦合等离子体质谱（ICP-MS）检测。将制备好的CTpBD COFs填充到固相萃取柱中，作为一种新型的、稳定的吸附剂用于元素分析。然后进行Cr（III）、Mn（II）、Co（II）、Ni（II）、Cd（II）、V（V）、Cu（II）、As（III）、Se（IV）和Mo（VI）的分离和富集，并通过ICP-MS测定含量。通过COF填充的在线SPE柱对目标痕量元素进行预富集，实现了2.1-21.6 ng L-1的低检测限沿着0.05-25 μ g L-1的宽线性范围。对于所有目标离子，为1。在100 ng L-1的样品浓度下，通过11次平行测定获得的相对标准偏差（RSD）为1.2%-4.3%，表明所开发的方法具有良好的重复性。我们提出的方法已成功地用于环境和食品样品中痕量元素的分析。(C)2017爱思唯尔B. V.保留所有权利。
Herein, for the first time, the typical porous Covalent Organic Frameworks (COFs) CTpBD with superior chemical stability and large surface area were applied as sorbents for solid phase extraction of trace ions via flow injection followed by inductively coupled plasma mass spectrometry (ICP-MS) detection. The well-prepared and fully-characterized CTpBD COFs were filled in solid phase extraction cartridge as novel and robust adsorbents for element analysis. Separation and enrichment of Cr (III), Mn (II), Co (II), Ni (II), Cd (II), V (V), Cu (II), As (III), Se (IV), and Mo (VI) was then carried out, and the contents were measured by ICP-MS. Owing to the large surface area and instinctive porous structure of CTpBD, preconcentration of the target trace elements via COF-filled on-line SPE column has achieved low detection limits of 2.1-21.6 ng L-1 along with a wide linearity range at 0.05-25 mu g L-1 for all target ions. The relative standard deviations (RSD) of 1.2%-4.3% obtained via 11 parallel determinations at the sample concentration of 100 ng L-1 revealed excellent repeatability of the developed methods Our proposed methods have been successfully utilized for trace element analysis in environmental and food samples. (C) 2017 Elsevier B.V. All rights reserved.