Canadian Chemical News, August 1st, 1991
Polyclinic aromatic hydrocarbons (PAHs, or polynuclear aromatic hydrocarbons) are widespread in the environment. They are characterized by the presence of three or more fused five- or six-membered aromatic rings (see Figure 1), relatively high-molecular weights, and hydrophobicity. Their nomenclature is complex, and the terminology used here is that recommended by IUPAC (1979). The major environmental concer about PAHs focusses on their role in mutagenesis and carcinogenesis in various animal phyla. Oxygen, sulphur, or nitrogen may substitute for ring carbons to yield heterocyclic compounds....
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