Source Characterization of Polycyclic Aromatic Hydrocarbons by Using Their Molecular Indices: An Overview of Possibilities - Reviews of Environmental Contamination and Toxicology - page 98

Fig. 17 The ratio of D2 / P2 . Evaporation leads to opposite degradation arrow direction
(i.e., decreases ratio). See Fig. 9 for the symbols and the text for explanation
Using the double ratio plot of D2/P2 versus D3/P3, Wang et al. ( 1999b ) suffi-
ciently resolved burn products and diesel fuel. Pyrogenic sources (coal tar, creosote
and fire tire wipe) have values below 0.4 for both ratios (Fig. 17 ; Neff et al. 1998 ;
Stout et al. 2001a ; Wang et al. 1999b , 2006 ). Together with other PAH markers (e.g.,
D1, FL0, PY0), the D n /P n ratios have been used to characterize pyrogenic products
mixed with petrogenic ones (Wang et al. 1999a , 2001 ).
The D n /P n ratios have been used to identify petrogenic sources (crudes, diesels,
etc.) of different origin; for example, in the studies of the Gulf War and of the 1989
Exxon Valdez oil spills and their weathering products (Hostettler et al. 2007 ; Kim