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Sökning: WFRF:(Kåredal Monica) > Konferensbidrag

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  • Abrahamsson, Camilla, et al. (författare)
  • Aerosolized particulate matter from fragmentation of carbon nanotube-enhanced concrete
  • 2023
  • Ingår i: Abstracts from the 2022 Airmon-10 conference and the 2023 Inhaled Particles and NanOEH conference. - 2398-7316 .- 2398-7308. ; 67:Supplement_1, s. i94-i95
  • Konferensbidrag (refereegranskat)abstract
    • Construction and demolition workers are exposed to high levels of particulate matter (PM) from building materials throughout their working life. Although nano-enabled building materials (NEBMs) may improve the performance and functionality of buildings, concerns are being raised regarding health risks from occupational exposure to PM from NEBMs. In this work, an experimental set-up for integrated resuspension and characterization of PM from NEBMs was developed and tested using three types of concrete (low density, normal, high strength), each enhanced with Carbon Nanotubes (CNTs) at different concentrations (0, low, high). The performance of portable devices used in occupational exposure assessments (DustTrak and NanoTracer) was compared with stationary instruments and gravimetric filter techniques. 40-70% of the mass and 90-98% of the number of particles were within the respirable fraction, with primary modes at 150 nm and 2-3 µm. Addition of CNTs significantly decreased mean particle number concentrations (PNCs) across the entire characterized size range (7 nm - 20 µm) for low density concrete, whereas the opposite was the case for normal strength and high strength concrete. It was hypothesised that the concrete matrix primarily governs the PM formation, which is in turn modulated by CNT-matrix interactions either suppressing or supporting fragmentation during crushing. SEM imaging could display partially submerged CNTs protruding from concrete fragments. Fundamental interactions at the interface of the nanomaterial and the surrounding matrix needs to be investigated to determine how the PM generated from NEBMs differ from their non-nano counterparts and how to prevent future exposure during demolition.
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  • Kåredal, Monica, et al. (författare)
  • Mass spectrometric monitoring of in vitro formed ad ducts between hexahydrophthalic anhydride (HHPA) and cysteine and lysine
  • 2002
  • Ingår i: Proceedings 50th ASMS Conference on Mass Spectrmetry and Allied Topics. ; , s. 325-326
  • Konferensbidrag (refereegranskat)abstract
    • The in vitro formed adducts between hexahydrophthalic anhydride (HHPA) and cysteine and lysine were monitored by mass spectrometry. Freshly synthesized N-acetyl-S-hexahydrophthaloyl-L-cysteine was dissolved in dry acetonitrile and added to a solution of N-acetyl-L-lysine in 0.1 M sodium phosphate buffer (pH 7.4) an incubated at 37°C. The reactions were monitored by LC/MS on a triple quadrupole mass spectrometer with electrospray ionization coupled to a HPLC system from Perkin Elmer. The results show that there was a rapid rearrangement of HHPA from most of the cysteines to the lysines, and that HHPA-adducts of cysteine will be transferred to lysine when encountered.
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