Nitrogen-rich covalent organic frameworks as solid-phase extraction adsorbents for separation and enrichment of four disinfection by-products in drinking water

• Published in: Journal of Chromatography A 2020-05, Vol.1619, p.460916, Article 460916
• Main Authors: Wang, Xin-Mei, Ji, Wen-Hua, Chen, Li-Zong, Lin, Jin-Ming, Wang, Xia, Zhao, Ru-Song
• Format: Article
• Language: English
• Subjects: Covalent organic frameworks; Disinfection by-products; Gas chromatography-mass spectrometry; Solid-phase extraction
• ISSN: 0021-9673
• DOI: 10.1016/j.chroma.2020.460916

•Novel TpTt-COFs with high chemical stability were synthesized and used as SPE materials.•TpTt-COFs achieved superior enrichment performance towards DBPs.•TpTt-COFs was used for the enrichment and analysis of DBPs in drinking water. Disinfection by-products (DBPs) in drinking water can pose a health risk to humans. In this work, a new nitrogen-rich covalent organic frameworks (TpTt-COFs) was synthesized and applied firstly as a novel solid-phase extraction (SPE) trapping media for four ultra-trace levels of DBPs in drinking water samples. Under the optimal conditions, these DBPs were absorbed on a SPE cartridge; then, the DBPs were eluted with the optimized volume of eluent. The concentrated elution was detected and quantified by gas chromatography-mass spectrometry. Low limits of detection (0.0004–0.0063 ng mL−1), wide linearity (0.002–50 µg L−1), good reproducibility (1.54–2.88%) and repeatability (1.28–3.40%) were obtained. This novel method has been successfully applied to the analysis of ultra-trace levels DBPs in real drinking water samples. These accurate experimental results by this method indicated that the novel TpTt-COFs as a SPE trapping material was an attractive option for efficient and effective analysis of ultra-trace levels DBPs in future.