Journal
ANALYTICAL CHEMISTRY
Volume 92, Issue 10, Pages 6900-6908Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.9b05524
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Funding
- New South Wales Smart Sensing Network (NSSN), Australia
- Australia Centre for Nanomedicine (ACN), Australia
- Development and Promotion of Science and Technology Talents (DPST) program
- Australia National Health and Medical Research Council (NHMRC) Career Development Fellowship [APP1163786]
- Scientia Fellowship program at UNSW
- Australian Research Council [DE160100987, FT150100060, CE140100036]
- Australian Research Council [DE160100987] Funding Source: Australian Research Council
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We report the development of metal-organic framework (MOF)-based probes for the direct and rapid detection and quantification of perfluorooctanoic acid (PFOA) by mass spectrometry. Four water-resistant MOFs-ZIF-8, UiO-66, MIL88-A, and Tb-2(BDC)(3)-were coated on poly(dopamine) precoated stainless steel needles and used to rapidly preconcentrate PFOA from water for direct analysis by nanoelectrospray ionization mass spectrometry. The analytical performance of each MOF for detecting PFOA was correlated with both the calculated binding energy of the MOF for PFOA and the relative change in the surface area of the MOF upon exposure to PFOA. MOF- functionalized probes can be used for the rapid (<5 min) and sensitive quantification of PFOA molecules at low ng L-1 levels in environmental water samples (i.e., tap water, rainwater, and seawater) with no sample preparation. The limit of detection of PFOA in ultrapure water was 11.0 ng L-1. Comparable accuracy to an accredited analytical method was achieved, despite the MOF-functionalized probe approach being similar to 40 times quicker and requiring similar to 10 times less sample. These features indicate that MOF-coated probes are promising for the direct and rapid monitoring of polyfluorinated substances and other pollutants in the field.
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