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Sökning: L773:9781713826514

  • Resultat 1-4 av 4
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1.
  • Andersen, Christina, et al. (författare)
  • Inhalation and dermal uptake of particle and gas phase phthalates - A human chamber exposure study
  • 2018
  • Ingår i: 15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018. - 9781713826514
  • Konferensbidrag (refereegranskat)abstract
    • We have exposed sixteen test subjects to particle and gas phase phthalates in the controlled chamber exposure study. Deuterium labelled phthalates were used to generate particle D4-DEHP (di(2-ethylhexyl) phthalate) and gas phase D4-DEP (diethyl phthalate) for exposures scenarios allowed studying the dermal only and combined inhalational and dermal uptake. Metabolites were measured in urine samples before and after three hours of exposure. The inhalation was the dominant route of uptake for both DEHP and DEP in this study design and exposure settings. Larger uptake of DEP compared to DEHP both via inhalation and dermal uptake was observed. Dermal uptake of DEHP was not observed in this study. Inhalational urinary excretion factors of the metabolites were found to be 0.73 for DEHP and 0.53 for DEP. This study also highlights the importance of taking into consideration the deposited dose of inhaled particles in studies of uptake of particles.
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2.
  • Eriksson, Axel C., et al. (författare)
  • The role of organic fraction of aerosol particles in uptake of indoor SVOC investigated with real time aerosol mass spectrometry
  • 2018
  • Ingår i: 15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018. - 9781713826514
  • Konferensbidrag (refereegranskat)abstract
    • We investigate the uptake of the Di(2-ethylhexyl) phthalate (DEHP) by laboratory generated and ambient aerosol particles passing through a 1.2 liter chamber covered with vinyl flooring on its internal surfaces. We found approximately five times more efficient DEHP uptake on a mass basis by organic particles (ambient particles) compared to laboratory generated salt particles. The increased uptake is likely due to increased adsorption by pre-existing organic aerosol, which is abundant in the ambient aerosol particles. This implies that compounds with adverse health outcomes are added to particles in indoor air after infiltration into buildings via gas-to-particle conversion of indoor generated SVOCs. We show that aerosol mass spectrometry is a suitable tool for highly time-resolved investigations of this process.
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3.
  • Larsson, Lennart, et al. (författare)
  • Use of a surface emissions trap for enhancing the indoor air quality
  • 2018
  • Ingår i: 15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018. - 9781713826514
  • Konferensbidrag (refereegranskat)abstract
    • Unsatisfactory indoor air quality (IAQ) can result from emissions of volatile organic compounds from the materials of the building. A surface emissions trap (cTrap) can be used to stop such emissions thus preventing them from reaching the indoor air. The present study concerned an apartment where the tenants experienced skin and mucous membrane irritation due to moisture-driven emissions from the glue used to attach the PVC flooring onto the concrete slab. The existing PVC flooring was removed and the flexible cTrap cloth was applied on the floor. On top of the cTrap was laid a laminate flooring. A clear improvement in the perceived IAQ was reported by the tenants already a few hours after the cTrap installation. Thus a cTrap installation may be an efficient means in restoring the IAQ in buildings e.g. following water damage.
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4.
  • Xiong, Jing, et al. (författare)
  • Discovery of environmental secrets for historical artefacts : how did micro-climate evolve in ancient tombs in initial phase
  • 2018
  • Ingår i: 15th Conference of the International Society of Indoor Air Quality and Climate (INDOOR AIR 2018). - : International Society of Indoor Air Quality and Climate. - 9781713826514
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Stable burial environments are vital for historical artefacts' conservations. However, it is still a mystery that how stable burial environments evolve and what the influences of environmental variations on historical artefacts are. In this study, based on field tests and CFD numerical simulations, the temperature and relative humidity evolution in M1 tomb chamber of mausoleum ZHANG An-Shi (~50 BC) were investigated. Whenever the tomb was buried in the coldest or hottest month, the temperature and relative humidity experienced rapid variations and achieved stability shortly after sealing. The changes of atmospheric components inside the ancient tomb relied mainly on the aerobic decomposition at the initial phase of burying. It suggests that historical artifacts are better to be excavated or conserved in the same microclimate as their final burial environment. The study paved the way for finding out environments of the ancient tomb chamber.
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  • Resultat 1-4 av 4

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