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Related Experiment Videos

Benzene emitted from glowing charcoal.

Maria Olsson1, Göran Petersson

  • 1Department of Chemical Environmental Science, Chalmers University of Technology, SE-412 96, Göteborg, Sweden. mariao@kmv.chalmers.se

The Science of the Total Environment
|February 28, 2003
PubMed
Summary

Benzene is a major emission from burning charcoal and firewood. High concentrations, especially during grilling, indicate benzene is a significant health hazard requiring exposure reduction measures.

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Area of Science:

  • Environmental Chemistry
  • Air Quality Monitoring
  • Combustion Science

Background:

  • Previous research on charcoal emissions primarily focused on carbon monoxide, polycyclic aromatic hydrocarbons (PAHs), and dioxins.
  • Aromatic compounds, particularly benzene, are significant but often overlooked byproducts of incomplete combustion from biomass and charcoal.
  • Understanding emission profiles is crucial for assessing public health risks associated with domestic and recreational burning.

Purpose of the Study:

  • To quantify and compare benzene emissions from various glowing embers, including commercial charcoal, firewood, and wood pellets.
  • To identify and measure other aromatic compounds emitted alongside benzene.
  • To evaluate the health implications of benzene as a predominant emission from burning solid fuels.

Main Methods:

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  • Utilized adsorbent sampling techniques to capture airborne compounds.
  • Employed Gas Chromatography-Mass Spectrometry (GC-MS) for the precise identification and quantification of aromatic compounds.
  • Measured emission concentrations under controlled conditions, including specific carbon dioxide levels.

Main Results:

  • Benzene was identified as the predominant aromatic compound emitted from glowing charcoal and firewood embers, with concentrations exceeding 10 mg m(-3) above grilling charcoal at 5% CO2.
  • Higher carbon content charcoal exhibited lower benzene emissions.
  • Wood pellets released less benzene than firewood embers; commercial charcoal and wood pellets had lower ethene and propene relative to benzene emissions compared to firewood.
  • Other aromatic compounds like methylbenzene, naphthalene, benzofuran, dibenzofuran, benzonitrile, and the PAH phenanthrene were emitted in significantly lower proportions relative to benzene.

Conclusions:

  • Benzene represents a more severe carcinogenic health hazard from burning charcoal and firewood than previously recognized, surpassing concerns over CO, PAHs, and dioxins.
  • Exposure-decreasing measures should prioritize reducing benzene emissions from these sources.
  • Further research into combustion byproducts and their health impacts is warranted, especially concerning volatile organic compounds (VOCs).