Determination of perfluorinated carboxylic acids in water using liquid chromatography coupled to a corona-charged aerosol detector

Qian, Zhou; Chen, Mantang; Zhu, Lihua; Tang, Heqing

doi:10.1016/j.talanta.2014.12.052

Cited by 9 publications

(4 citation statements)

References 36 publications

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“…After removing the solids by centrifugation, the collected solution was filtered through a 0.22 μm membrane and then subjected to HPLC analysis. Similar to our previous work, 27 the PFOA concentration was measured with HPLC on an Ultimate 3000 series system (Dionex, Idstein, Germany) equipped with a Corona Ultra RS charged aerosol detector (CAD, Thermo Scientific, Bellefonte, PA). The analysis was performed on a Symmetry C8 column (150 mm × 3.9 mm, 5 μm particle size; Waters, Ireland).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…X-ray photoelectron spectrometry (XPS) was conducted on Kratos AXIS-ULTRA DLD-600W (Shimadzu, Japan), in which the binding energy is calibrated using the C 1s peak as 284.6 eV. 19 F and 27 Al MAS NMR experiments were performed at room temperature on a Bruker Avance III 500 MHz spectrometer (Bruker, Germany) equipped with a 2.5 mm Bruker 1 H/ 19 F/X probe. The samples were loaded into a zirconia rotor and spun at an MAS rate of 20 kHz.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…In addition, the fate of fluorine was identified by solid-state nuclear magnetic resonance (SS NMR) and XPS measurements. High-resolution XPS spectra of F 1s and NMR spectra of 19 F and 27 Al demonstrated that F − eliminated from PFOA in 2e), due to the instantaneous temperature produced by ball milling having a short lifetime of 2−10 ns. 29 After the ball milling, both PS and Al 2 O 3 were not molten (SI Figure S3), because the surrounding temperature was much lower than their melting points.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Complete Defluorination and Mineralization of Perfluorooctanoic Acid by a Mechanochemical Method Using Alumina and Persulfate

Wang

Zhou

et al. 2019

Environ. Sci. Technol.

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Perfluorooctanoic acid (PFOA) is a persistent organic pollutant that has received concerns worldwide due to its extreme resistance to conventional degradation. A mechanochemical (MC) method was developed for complete degradation of PFOA by using alumina (Al2O3) and potassium persulfate (PS) as comilling agents. After ball milling for 2 h, the MC treatment using Al2O3 or PS caused conversion of PFOA to either 1-H-1-perfluoroheptene or dimers with a defluorination efficiency lower than 20%, but that using both Al2O3 and PS caused degradation of PFOA with a defluorination of 100% and a mineralization of 98%. This method also caused complete defluorination of other C3∼C6 homologues of PFOA. The complete defluorination of PFOA attributes to Al2O3 and PS led to the weakening of the C–F bond in PFOA and the generation of hydroxyl radical (•OH), respectively. During the MC degradation, Al2O3 strongly anchors PFOA through COO––Al coordination and in situ formed from Lewis-base interaction and PS through hydrogen bond. Meanwhile, mechanical effects induce the homolytic cleavage of PS to produce SO4 •–, which reacts with OH group of Al2O3 to generate •OH. The degradation of PFOA is initiated by decarboxylation as a result of weakened C–COO– due to Al3+ coordination. The subsequent addition of •OH, elimination of HF, and reaction with water induce the stepwise removal of all carboxyl groups and F atoms as CO2 and F– , respectively. Thus, complete defluorination and mineralization are achieved.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

See 1 more Smart Citation

Complete Defluorination and Mineralization of Perfluorooctanoic Acid by a Mechanochemical Method Using Alumina and Persulfate

Wang

Zhou

et al. 2019

Environ. Sci. Technol.

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“…The charged analyte particles are then collected and the electrical charges are measured with an electrometer. CAD has extensively been applied for the analysis of impurities in pharmaceuticals, 15,16 food products and herbal dietary supplements, [17][18][19] pharmaceutical formulations, 20,21 and environmental pollutants, 22 etc. Moreover, HPLC-CAD has been performed on the analysis of major saponins in raw notoginseng by external standard method using commercially available reference standards.…”

Section: Introductionmentioning

confidence: 99%