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ter (POM) showsThe presence of PAH in exhaust gases, combustion emissions, and the atmosphere has been thoroughly investigated (27-30). However, several of the analytical techniques used for the fractionation and isolation of PAH in complex samples do not separate the PAH from the mononitro-PAH. Mononitro-PAH have been reported to be present in the PAH fraction in only a few cases, indicating that mononitro-PAH generally is not present in amounts comparable with those of the most common carcinogenic PAH in environmental samples.
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