K A

Relative retention time

FIGURE 10.35 GC-MS selected ion monitoring (SIM) of the molecular ions (m/z 247) of nitrofluoranthene (NF) and nitropyrene (NP) isomers in an extract of particles collected at night in Claremont, California, 1800 to 2400 hours on September 14, 1985 (adapted from Arey et al., 1988b).

For example, Fig. 10.37 shows a mutagram of an extract of ambient gas-phase POM collected on polyurethane foam plugs in Claremont, California, along with mutagrams of the extracts of PUF samples collected from environmental chamber studies of the OH radical initiated reactions of fluorene and naphthalene, respectively (Arey et al., 1992; Harger et al., 1992; Atkinson and Arey, 1994). Clearly, the mutagrams from the OH-initiated reactions are very similar to that of ambient air.

Thus, most of the activity of the products of the photooxidation of these two PAHs is in fraction 4. In the naphthalene reaction, key products in fraction 4 are f- and 2-nitronaphthalene (Arey et al., 1992), with

ONO?

FIGURE 10.36 Mechanism of oxidation of fluoranthene by the nitrate radical (adapted from Atkinson and Arey, 1997).

FIGURE 10.36 Mechanism of oxidation of fluoranthene by the nitrate radical (adapted from Atkinson and Arey, 1997).

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