The use of high resolution graphite furnace molecular absorption spectrometry (HR -MAS) for total fluorine determination in extractable organofluorines (EOF).

Autor: Akhdhar A; Trace Element Speciation Laboratory Aberdeen (TESLA), Department of Chemistry, University of Aberdeen, Aberdeen, AB24 3UE, Scotland, UK; Department of Chemistry, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia., Schneider M; Trace Element Speciation Laboratory Aberdeen (TESLA), Department of Chemistry, University of Aberdeen, Aberdeen, AB24 3UE, Scotland, UK; Departamento de Química, Universidade Federal de Santa Catarina, Florianopolis, 88040-900, Brazil., Orme A; Trace Element Speciation Laboratory Aberdeen (TESLA), Department of Chemistry, University of Aberdeen, Aberdeen, AB24 3UE, Scotland, UK., Schultes L; Department of Environmental Science and Analytical Chemistry (ACES), Stockholm University, Stockholm, Sweden., Raab A; Trace Element Speciation Laboratory Aberdeen (TESLA), Department of Chemistry, University of Aberdeen, Aberdeen, AB24 3UE, Scotland, UK., Krupp EM; Trace Element Speciation Laboratory Aberdeen (TESLA), Department of Chemistry, University of Aberdeen, Aberdeen, AB24 3UE, Scotland, UK., Benskin JP; Department of Environmental Science and Analytical Chemistry (ACES), Stockholm University, Stockholm, Sweden., Welz B; Departamento de Química, Universidade Federal de Santa Catarina, Florianopolis, 88040-900, Brazil., Feldmann J; Trace Element Speciation Laboratory Aberdeen (TESLA), Department of Chemistry, University of Aberdeen, Aberdeen, AB24 3UE, Scotland, UK. Electronic address: j.feldmann@abdn.co.uk.
Jazyk: angličtina
Zdroj: Talanta [Talanta] 2020 Mar 01; Vol. 209, pp. 120466. Date of Electronic Publication: 2019 Oct 18.
DOI: 10.1016/j.talanta.2019.120466
Abstrakt: The determination of total fluorine content using high-resolution graphite furnace continuum source molecular absorption spectrometry (HR- MAS) has been employed in a variety of samples for over 10 years. However, most of the samples analysed by HR- MAS are rich in fluoride, with negligible levels of organic fluorinated species. With an increase in concern surrounding per- and polyfluoroalkyl substances (PFASs), new methods to measure total fluorine of organofluorine using different techniques have been developed. However, no studies focused on PFASs behaviour in HR-MAS have been performed. As these compounds encompass a wide range of different structures, boiling points, decomposition temperatures and matrix interactions, a loss of accuracy can occur when an aqueous external calibration is performed using only one compound. To overcome this issue, an investigation into permanent modifiers for the graphite furnace was performed. After optimisation similar sensitivity for different PFCA was achieved when 400 μg of W was used as a permanent modifier together with an optimised temperature program. The relative deviation between the different PFCA standard slopes relative to the PFOA slope was lower than 15%. The instrumental limit of detection and quantification (LOD and LOQ, respectively) of total fluorine as total PFCA was 0.1 mg L -1 and 0.3 mg L -1 , respectively, while the method LOD and LOQ (using solid phase extraction) was 0.3 μg L -1 and 1.0 μg L -1 , respectively. The developed method gave satisfactory recoveries for the spiked PFCA into seawater, river water and effluent using PFOA calibration standards. The optimised method is useful for measuring extractable organofluorines (EOF) when only ionic PFASs such as PFCA are expected. When other organofluorines are expected, the results using HR GF-MAS should be taken with caution.
(Copyright © 2019 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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