Pyrogens sources

PAHs are released to the environment from a number of sources pyrogenic sources including fossil fuel combustion and pyrolytic processes of organic matter such as incineration and petrogenic sources such as oils spills. Direct oil spilled from stationary sources and accidents cause contamination of land. Oil spills at US Army bases in South Korea is reported as a source of soil and groundwater contamination to nearby area... 

Polycyclic aromatic compounds (PACs) are common environmental pollutants derived either from fossil fuels or as atmospheric contaminants as a result of incomplete combustion processes (pyrogenic sources Volkman et al., 1997 Kaplan et al., 1997). Quantitative results of the PACs investigated are presented as concentration profiles in Fig. 5A-C or are listed in Tab. 1. 

On the gross level PAH can comprise a much higher mass percentage in most pyrogenic source materials than in most petrogenic source materials. 

UV fluorimetry (UVF) is a sensitive method for the detection and quantification of aromatic hydrocarbons and it is not affected by aliphatic hydrocarbons. Thus it has proven to be a useful tool for measuring fossil hydrocarbon concentrations in seawater. UV fluorimetry does not distinguish between alkyl substituted and unsubstituted aromatic hydrocarbons and therefore is not suitable for discriminating between fossil and pyrogenic sources. Hydrocarbon degradation products with aromatic structure often present in oil contaminated waters will also fluoresce. 

Besides some of the technical complexities noted above, air Pb at toxic levels for human exposures is at microlevel and submicrolevel amounts. A brief reading of the levels of air Pb permissible in emissions to the human environment makes this apparent. This analytical reality meant that quantitative analysis of air Pb for purposes of health risk characterization and evaluation of dose—response relationships was not feasible. Second, the fact that lead entered ambient air where people live by either mobile (largely vehicular emissions) or point sources (e.g., smelters, incinerators, other pyrogenic sources) meant legislation and associated rales and regulations had to be crafted with these sources in mind. 

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