Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 344, Issue -, Pages 220-229Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2017.10.013
Keywords
Metal ions; ICP-MS; Covalent organic frameworks; Solid phase extraction; Food
Categories
Funding
- Beijing Municipal Science and Technology Project [Z171100004517013]
- National Natural Science Foundation of China [31430068]
- National Key Research and Development Program of China [2016YFD0401202]
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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.
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