Three birds with one Fe3cO4 nanoparticle: integration of microwave digestion, solid phase extraction, and magnetic separation for sensitive determination of arsenic and antimony in fish

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DOIResolve DOI: http://doi.org/10.1021/acs.analchem.5b00712
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TypeArticle
Journal titleAnalytical Chemistry
ISSN0003-2700
Volume87
Issue12
Pages58665871; # of pages: 6
SubjectAntimony; Arsenic; Fish; Fluorescence spectroscopy; Mass spectrometry; Microwave irradiation; Nanomagnetics; Nanoparticles; Phase separation; Certified reference materials; Hydride generation atomic fluorescence spectrometry; Magnetic nano-particles; Magnetic nanoparti cles (MNPs); Microwave digestion (MWD); Potential interferences; Replicate measurements; Solid-phase extraction
AbstractAn environmentally friendly and fast sample treatment approach that integrates accelerated microwave digestion (MWD), solid phase extraction, and magnetic separation into a single step was developed for the determination of arsenic and antimony in fish samples by using Fe3O4 magnetic nanoparticles (MNPs). Compared to conventional microwave digestion, the consumption of HNO3 was reduced significantly to 12.5%, and the digestion time and temperature were substantially decreased to 6 min and 80 °C, respectively. This is largely attributed to Fe3O4 magnetic nanoparticles being a highly effective catalyst for rapid generation of oxidative radicals from H2O2, as well as an excellent absorber of microwave irradiation. Moreover, potential interferences from sample matrices were eliminated because the As and Sb species adsorbed on the nanoparticles were efficiently separated from the digests with a hand-held magnet prior to analysis. Limits of detection for arsenic and antimony were in the range of 0.01–0.06 μg g–1 and 0.03–0.08 μg g–1 by using hydride generation atomic fluorescence spectrometry, respectively, and further improved to 0.002–0.005 μg g–1 and 0.005–0.01 μg g–1 when inductively coupled plasma mass spectrometry was used as a detector. The precision of replicate measurements (n = 9) was better than 6% by analyzing 0.1 g test sample spiked with 1 μg g–1 arsenic and antimony. The proposed method was validated by analysis of two certified reference materials (DORM-3 and DORM-4) with good recoveries (90%–106%).
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Measurement Science and Standards
Peer reviewedYes
NPARC number21277001
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Record identifier820f1bf6-f629-42dc-96f1-2bf4123ef2d1
Record created2015-11-10
Record modified2016-05-09
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