期刊
JOURNAL OF SEPARATION SCIENCE
卷 45, 期 9, 页码 1493-1501出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.202100905
关键词
bisphenols; covalent organic frameworks; micro-solid phase extraction; online analysis; plastic samples
资金
- National Natural Science Foundation of China [21765027]
- Natural Science Foundation of Guizhou Province [2018[1188]]
The beta-ketoenamine-linked TpPa-1 synthesized by 1,3,5-triformylphloroglucinol and paraphenylenediamine was employed as an absorbent for online micro-solid phase extraction of trace bisphenols. TpPa-1 exhibited large surface areas, high stability, and hydrophobicity, and showed superior enrichment capacity for extracting bisphenols compared to commercial sorbents. The developed method demonstrated a wide linear range and high sensitivity for the detection of bisphenols in plastic samples.
Covalent organic frameworks with tunable porous crystallinity and outstanding stability have exhibited fascinating pretreatment performance as ideal extraction media. Herein, the beta-ketoenamine-linked TpPa-1 synthesized by 1,3,5-triformylphloroglucinol and paraphenylenediamine was employed as the absorbent for online micro-solid phase extraction of trace bisphenols combined with high-performance liquid chromatography detection. A series of characterizations indicated that the TpPa-1 possessed large surface areas, high stability, and hydrophobicity. The main experimental parameters affecting the extraction efficiency were optimized in detail. Compared with four commercial sorbents, the TpPa-1 exhibited superior enrichment capacity for extracting bisphenols. Under the optimum conditions, the established method demonstrated a wide linear range and high sensitivity with the limit of detection ranging from 0.05-0.06 mu g/L. Furthermore, the developed method was successfully applied to determine bisphenols in plastic samples. Bisphenol A was actually detected in a transparent box with a concentration of 0.31 mu g/g, and the recoveries of the four bisphenols in the plastic samples were 80.5-116% with the relative standard deviation less than 9.2%. Such performance was attributed to recognition affinity, including the pi-pi affinity, hydrophobic effect, and hydrogen bond. These results demonstrated that TpPa-1 possessed great potential to be an excellent pretreatment medium for online separation and analysis of trace analytes in complex samples.
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