Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 411, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125141
Keywords
Magnetic field-reinforced in-tube solid phase microextraction; Mercury species; Speciation analysis; Monolith; Adsorbent; Environmental water
Categories
Funding
- National Natural Science Foundation of China [21976149, 21777133]
- Natural Science Foundation of Fujian Province [2020J01045]
- Fundamental Research Funds for the Central Universities [20700200122]
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A novel sorbent based on task specific monolith doped with Fe3O4 was developed for the in-tube solid phase microextraction (IT-SPME) of mercury species, with the addition of a magnetic field enhancement. This method proved effective in quantifying mercury at ultra-trace levels in various water samples, with high precision and reliability.
In this study, a novel sorbent based on task specific monolith doped with Fe3O4 was in situ fabricated in capillary and acted as the extraction medium of magnetic field-reinforced in-tube solid phase microextraction (MFR/IT-SPME) to trap and preconcentrate mercury species which were coordinated with dithizone to form chelates. Various characterization technologies evidenced that the obtained monolithic adsorbent presented porous and super paramagnetic properties, and possessed abundant functional groups. Results evidenced that the implementation of magnetic field during extraction stages enhanced the extraction efficiency of studied Hg chelates from 48.5% to 75.3% to 69.9-94.4%. Under the optimized extraction parameters, the introduced MFR/IT-SPME was online coupled to HPLC/DAD to quantify mercury species at ultra-trace levels in various water samples. Limits of detection varied from 0.0067 mu g/L to 0.016 mu g/L, and the RSDs for precision were below 7.5%. Additionally, related extraction mechanism was deduced and revealed multiple forces co-contributed to the enrichment. The reliability and accuracy of suggested online approach for speciation analysis of mercury was well proved by confirmatory experiments.
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