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Emissions from heated indoor dust
Ellen Katrine Pedersen1, Olav Bjørseth, Tore Syversen
1Department of Industrial Economics and Technology Management, Norwegian University of Science and Technology, Trondheim. ellen.k.pedersen@medisin.ntnu.no
Environment International
|March 1, 2002
Summary
Heating indoor dust above 150°C can cause oxidation and release harmful compounds like aldehydes and ketones. Keeping hot surfaces below this temperature minimizes indoor dust emissions and improves air quality.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Indoor Air Quality
Background:
- Indoor dust accumulates various adsorbed and intrinsic compounds.
- Heating indoor dust can lead to the release of volatile and semi-volatile organic compounds.
- Understanding thermal decomposition pathways is crucial for indoor air quality management.
Purpose of the Study:
- To investigate the thermal decomposition and oxidation of indoor dust.
- To identify compounds emitted from dust when heated under oxidative and inert atmospheres.
- To establish safe temperature limits for hot surfaces in indoor environments.
Main Methods:
- Collected settled indoor dust from a university building.
- Heated fine dust fractions from 50-250°C in air (oxidative) and helium (inert) atmospheres.
- Analyzed emitted compounds using thermal desorption coupled with gas chromatography-mass spectrometry (GC-MS).
Main Results:
- Oxidation of adsorbed compounds and decomposition of dust occurred upon heating.
- Significant emissions of aldehydes and ketones were observed in air between 150-200°C.
- Semi-volatile organic compounds (SVOCs) were emitted above 150°C in helium, but not detected in air, likely due to oxidation.
Conclusions:
- Indoor dust undergoes oxidation and decomposition when heated.
- Emissions of aldehydes, ketones, and SVOCs are temperature-dependent.
- Recommend keeping hot surface temperatures below 150°C to minimize indoor dust emissions and associated risks.