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  • 1.
    Arrhenius, Karine
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Kemi.
    Brown, Andrew S.
    NPL National Physical Laboratory, UK.
    van der Veen, Adriaan M. H.
    VSL Dutch Metrology Institute, Netherlands.
    Suitability of different containers for the sampling and storage of biogas and biomethane for the determination of the trace-level impurities - A review2016Inngår i: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 902, s. 22-32Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    The traceable and accurate measurement of biogas impurities is essential in order to robustly assess compliance with the specifications for biomethane being developed by CEN/TC408. An essential part of any procedure aiming to determinate the content of impurities is the sampling and the transfer of the sample to the laboratory. Key issues are the suitability of the sample container and minimising the losses of impurities during the sampling and analysis process. In this paper, we review the state-of-the-art in biogas sampling with the focus on trace impurities. Most of the vessel suitability studies reviewed focused on raw biogas. Many parameters need to be studied when assessing the suitability of vessels for sampling and storage, among them, permeation through the walls, leaks through the valves or physical leaks, sorption losses and adsorption effects to the vessel walls, chemical reactions and the expected initial concentration level. The majority of these studies looked at siloxanes, for which sampling bags, canisters, impingers and sorbents have been reported to be fit-for-purpose in most cases, albeit with some limitations. We conclude that the optimum method requires a combination of different vessels to cover the wide range of impurities commonly found in biogas, which have a wide range of boiling points, polarities, water solubilities, and reactivities. The effects from all the parts of the sampling line must be considered and precautions must be undertaken to minimize these effects. More practical suitability tests, preferably using traceable reference gas mixtures, are needed to understand the influence of the containers and the sampling line on sample properties and to reduce the uncertainty of the measurement.

  • 2.
    Gonzalez de Vega, Raquel
    et al.
    University of Graz, Austria.
    Plassmann, Merle
    Stockholm University, Sweden.
    Clases, David
    University of Graz, Austria.
    Zangger, Klaus
    University of Graz, Austria.
    Müller, Viktoria
    James Hutton Institute, UK.
    Rosenberg, Erwin
    TU Wien, Austria.
    Reimann, Anders
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Skedung, Lisa
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Benskin, Jonathan P.
    Stockholm University, Sweden.
    Feldmann, Jörg
    University of Graz, Austria.
    A multi-platform approach for the comprehensive analysis of per- and polyfluoroalkyl substances (PFAS) and fluorine mass balance in commercial ski wax products2024Inngår i: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 1314, artikkel-id 342754Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The unique properties of per- and polyfluoroalkyl substances (PFAS) have led to their extensive use in consumer products, including ski wax. Based on the risks associated with PFAS, and to align with PFAS regulations, the international ski federation (FIS) implemented a ban on products containing “C8 fluorocarbons/perfluorooctanoate (PFOA)” at all FIS events from the 2021/2022 season, leading manufactures to shift their formulations towards short-chain PFAS chemistries. To date, most studies characterising PFAS in ski waxes have measured a suite of individual substances using targeted analytical approaches. However, the fraction of total fluorine (TF) in the wax accounted for by these substances remains unclear. In this study, we sought to address this question by applying a multi-platform, fluorine mass balance approach to a total of 10 commercially available ski wax products. Analysis of TF by combustion ion chromatography (CIC) revealed concentrations of 1040–51700 μg F g−1 for the different fluorinated waxes. In comparison, extractable organic fluorine (EOF) determined in methanol extracts by CIC (and later confirmed by inductively-coupled plasma-mass spectrometry and 19F- nuclear magnetic resonance spectroscopy) ranged from 92 to 3160 μg g−1, accounting for only 3–8.8 % of total fluorine (TF). Further characterisation of extracts by cyclic ion mobility-mass spectrometry (IMS) revealed 15 individual PFAS with perfluoroalkyl carboxylic acid concentrations up to 33 μg F g−1, and 3 products exceeding the regulatory limit for PFOA (0.025 μg g−1) by a factor of up to 100. The sum of all PFAS accounted for only 0.01–1.0 % of EOF, implying a high percentage of unidentified PFAS, thus, pyrolysis gas chromatography-mass spectrometry was used to provide evidence of the nature of the non-extractable fluorine present in the ski wax products. 

    Fulltekst (pdf)
    fulltext
  • 3.
    Hakonen, Aron
    et al.
    Swedish Meteorological and Hydrological Institute, Sweden; University of Gothenburg, Sweden.
    Anderson, Leif G.
    University of Gothenburg, Sweden.
    Engelbrektsson, Johan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Kemi.
    Hulth, Stefan
    University of Gothenburg, Sweden.
    Karlson, Bengt S.O.
    Swedish Meteorological and Hydrological Institute, Sweden.
    A potential tool for high-resolution monitoring of ocean acidification2013Inngår i: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 786, nr Jul, s. 1-7Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Current anthropogenic carbon dioxide emissions generate besides global warming unprecedented acidification rates of the oceans. Recent evidence indicates the possibility that ocean acidification and low oceanic pH may be a major reason for several mass extinctions in the past. However, a major bottleneck for research on ocean acidification is long-term monitoring and the collection of consistent high-resolution pH measurements. This study presents a low-power (<1 W) small sample volume (25 μL) semiconductor based fluorescence method for real-time ship-board pH measurements at high temporal and spatial resolution (approximately 15. s and 100. m between samples). A 405. nm light emitting diode and the blue and green channels from a digital camera was used for swift detection of fluorescence from the pH sensitive dye 6,8-Dihydroxypyrene-1,3-disulfonic acid in real-time. Main principles were demonstrated by automated continuous measurements of pH in the surface water across the Baltic Sea and the Kattegat region with a large range in salinity (~3-30) and temperature (~0-25 °C). Ship-board precision of salinity and temperature adjusted pH measurements were estimated as low as 0.0001 pH units.

  • 4.
    Lyven, BM
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.
    Haraldsson, C
    Optimization of on-channel preconcentration in flow field-flow fractionation for the determination of size distributions of low molecular weight colloidal material in natural waters1997Inngår i: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 357, nr 3, s. 187-196Artikkel i tidsskrift (Annet vitenskapelig)
  • 5. Petersson, K
    et al.
    Ilver, Dag
    RISE., Swedish ICT, Acreo.
    Johansson, Christer
    RISE., Swedish ICT, Acreo.
    Krozer, A
    RISE., Swedish ICT, Acreo.
    Brownian motion of aggregating nanoparticles studied by photon correlation spectroscopy measurements of dynamic magnetic properties2006Inngår i: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 573-574, s. 138-146Artikkel i tidsskrift (Fagfellevurdert)
  • 6.
    Strömberg, Niklas
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Plasmophore sensitized imaging of ammonia release from biological tissues using optodes2011Inngår i: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 704, nr 1-2, s. 139-145Artikkel i tidsskrift (Fagfellevurdert)
  • 7. Yoshimatsu, K
    et al.
    Reimhult, K
    Krozer, A
    RISE., Swedish ICT, Acreo.
    Mosbach, K
    Sode, K
    Ye, L
    Uniform molecularly imprinted microspheres nanoparticles prepared by precipitation polymerization2007Inngår i: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 584, nr 1, s. 112-121Artikkel i tidsskrift (Fagfellevurdert)
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