Journal
TALANTA
Volume 211, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2020.120723
Keywords
Miniaturized dispersive solid-phase extraction; Metal-organic frameworks; Core-shell microparticles; Silica-based materials; Water analysis; Novel sorbent material
Categories
Funding
- European Social Fund
- Spanish Ministry of Economy and Competitiveness (MINECO) [MAT2017-89207-R]
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Core-shell SiO2@CIM-80(Al) microspheres were synthesized, characterized, and used as novel sorbent in a dispersive miniaturized solid-phase extraction (D-mu SPE) method for the determination of fourteen polycyclic aromatic hydrocarbons (PAHs) in wastewaters by ultra-high performance liquid chromatography coupled to a fluorescence detector (UHPLC-FD). A Doehlert experimental design permitted to optimize the main parameters affecting the microextraction procedure, intending the obtaining of a simple approach. Optimized extraction conditions include 13 mg of SiO2@CIM-80(Al) microparticles (similar to 2 mg CIM-80(Al)), 2.5 min of extraction time, 0.125 mL of acetonitrile (ACN) as desorption solvent and 0.5 min of desorption time. The entire method showed adequate analytical performance with limits of detection down to 5 ng L-1, and inter-day precision lower than 14.1% for a concentration level of 0.5 mu g L-1. The extraction capability of SiO2@CIM-80(Al) microspheres was compared to that obtained with commercially available silica microspheres and the neat MOF CIM-80(Al), demonstrating the advantages of the use of MOF core-shell sorbents in D-mu SPE.
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