Transcription of Chapter 5.9 Polycyclic aromatic hydrocarbons (PAHs)
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Chapter 5.9 Polycyclic aromatic hydrocarbons (PAHs)
WHO Regional Office for Europe, Copenhagen, Denmark, 2000 1 Chapter Polycyclic aromatic hydrocarbons (PAHs) General description Polycyclic aromatic hydrocarbons (PAHs) are a large group of organic compounds with two or more fused aromatic rings. They have a relatively low solubility in water, but are highly lipophilic. Most of the PAHs with low vapour pressure in the air are adsorbed on particles. When dissolved in water or adsorbed on particulate matter, PAHs can undergo photodecomposition when exposed to ultraviolet light from solar radiation. In the atmosphere, PAHs can react with pollutants such as ozone, nitrogen oxides and sulfur dioxide, yielding diones, nitro- and dinitro-PAHs, and sulfonic acids, respectively.
Indeno[1,2,3-cd]pyrene 4.5 1.1 Methylphenanthrenes 7.0 1.4 Perylene 1.2 0.14 Phenanthrene 2.4 0.9 Picene 0.73 0.26 Pyrene 7.3 1.3 The average total BaP content in the mainstream smoke of 1 cigarette was 35 ng before 1960 and 18 ng in 1978-1979; modern "low tar" cigarettes deliver 10 ng BaP. The concentration of BaP in a room extremely polluted ...
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