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Sökning: WFRF:(Lord Heather L.)

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1.
  • Ruyle, Bridger J., et al. (författare)
  • Interlaboratory Comparison of Extractable Organofluorine Measurements in Groundwater and Eel (Anguilla rostrata) : Recommendations for Methods Standardization
  • 2023
  • Ingår i: Environmental Science and Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 57:48, s. 20159-20168
  • Tidskriftsartikel (refereegranskat)abstract
    • Research on per- and polyfluoroalkyl substances (PFAS) frequently incorporates organofluorine measurements, particularly because they could support a class-based approach to regulation. However, standardized methods for organofluorine analysis in a broad suite of matrices are currently unavailable, including a method for extractable organofluorine (EOF) measured using combustion ion chromatography (CIC). Here, we report the results of an international interlaboratory comparison. Seven laboratories representing academia, government, and the private sector measured paired EOF and PFAS concentrations in groundwater and eel (Anguilla rostrata) from a site contaminated by aqueous film-forming foam. Among all laboratories, targeted PFAS could not explain all EOF in groundwater but accounted for most EOF in eel. EOF results from all laboratories for at least one replicate extract fell within one standard deviation of the interlaboratory mean for groundwater and five out of seven laboratories for eel. PFAS spike mixture recoveries for EOF measurements in groundwater and eel were close to the criterion (±30%) for standardized targeted PFAS methods. Instrumental operation of the CIC such as replicate sample injections was a major source of measurement uncertainty. Blank contamination and incomplete inorganic fluorine removal may introduce additional uncertainties. To elucidate the presence of unknown organofluorine using paired EOF and PFAS measurements, we recommend that analysts carefully consider confounding methodological uncertainties such as differences in precision between measurements, data processing steps such as blank subtraction and replicate analyses, and the relative recoveries of PFAS and other fluorine compounds.
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2.
  • Mahoney, Joseph L., et al. (författare)
  • Unstructured youth recreation centre participation and antisocial behaviour development : Selection influences and the moderating role of antisocial peers.
  • 2004
  • Ingår i: International Journal of Behavioral Development. - : SAGE Publications. - 0165-0254 .- 1464-0651. ; 28:6, s. 553-560
  • Tidskriftsartikel (refereegranskat)abstract
    • This study involves a two-year longitudinal investigation of adolescent participation in unstructured youth recreation centres and the development of antisocial behaviour. Participants were 1163 adolescents who represented 92% of all eighth-grade students in the town of Orebro, Sweden, during the fall of 1999. Antisocial young people and those with poor relations to parents or school were likely to become involved in the centres. After controlling for these selection influences, the frequency of youth centre participation was associated with a significant increase in antisocial behaviour over time for boys and girls. Youth centres that aggregated many antisocial peers together were particularly likely to promote the antisocial behaviour of new attendees. The findings are consistent with prior theory and research on youth development and out-of-school activities. Activities that lack structure and skill-building aims appear to attract high-risk adolescents and the resulting social environment is conducive to the development of antisocial behaviour.
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