Environmental Engineering Reference
In-Depth Information
Fig. 21 The ratio of BaP / ghi for different sources. See Fig. 9 for the symbols and the text for
explanation
Together with the BeP/ ghi ratio, the Cor/BeP ratio (six over five rings) has been
used to distinguish or apportion traffic sources (1.8) and non-traffic sources (0.3)
(Daisey et al. 1986 ; Jensen et al. 1993 ; Larsen and Baker 2003 and references cited
by these authors). When doing so, there are two equations to be solved simultane-
ously (Larsen and Baker 2003 ). Applying this method at different locations revealed
significant differences for the Cor/BeP ratio (>20%). Thus, location-specific source
inventories are required prior to application. If only the Cor/BeP is available, then it
can be assumed that the excess BeP is unrelated to traffic (Larsen and Baker 2003 ).
Alternatively, the Cor/IP ratio may be used to distinguish gasoline from wood burn-
ings (Okuda et al. 2002 ).
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