Journal
JOURNAL OF SEPARATION SCIENCE
Volume 39, Issue 5, Pages 910-917Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201501129
Keywords
Dispersive solid-phase extraction; Graphene oxide; Mesoporous silica; Neonicotinoid pesticides; Tea infusion
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Funding
- Modern Agro-Industry Technology Research System [nycytx-26]
- tea quality and risk assessment of innovation team of science and technology innovation project in Chinese Academy of Agricultural Sciences [CAAS-ASTIP-2014-TRICAAS]
- Zhejiang Provincial Natural Science Foundation of China [LY15C200019]
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An analytical protocol that includes solid-phase purification and extraction is successfully developed for the determination of trace neonicotinoid pesticides in tea infusion. The method consists of a purification on amino-functionalized mesoporous silica SBA-15 followed by a solid-phase extraction based on graphene oxide before ultra high performance liquid chromatography with tandem mass spectrometry analysis. Parameters that significantly affected the extraction of the neonicotinoids onto graphene oxide, such as the amount of adsorbent, extraction time, pH, elution solvent, etc. were optimized. The amino-functionalized mesoporous silica SBA-15 has been proved to be an efficient adsorbent for removal of polyphenols especially catechins from tea infusion. Graphene oxide exhibits a very rapid adsorption rate (within 10 min) and high adsorption capacities for neonicotinoids at low initial concentration (0.01-0.5 mg/L). The analysismethod gave a good determination coefficient (r(2) > 0.99) for each pesticide and high recoveries in the range of 72.2-95.0%. Powder X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and UV-vis spectroscopy were utilized to identify the structure and morphology of graphene oxide. The adsorption driving force of neonicotinoids on graphene oxidemainly depends on pi-pi electron donor-acceptor interaction and electrostatic interaction.
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