Environmental Engineering Reference
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Fig. 22
The
L
/
H
ratio for different sources. See Fig.
9
for the symbols and the text for
explanation
For both ratios (L/H and LPAH/HPAH, Figs.
22
and
23
), values <1 indicate pyro-
genic pollution and values >1 indicate petrogenic contamination (De Luca et al.
2004
; Karlsson and Viklander
2008
; Magi et al.
2002
). Nevertheless, several
pyrogenics (coals, coal tars, diesel combustion etc.) show L/H >1 (Fig.
22
).
Similarly, LPAH/HPAH lies in the range of 0.6-2.3 for pyrogenics, whereas petro-
genics usually have LPAH/HPAH >2 (Fig.
23
).
The sum of concentrations of ten major non-alkylated PAHs (FL0, PY0, BaA,
C0, B(b + k)F, BaP, BeP, IP, and
ghi
) is usually referred to as ʣCOMB, and serves as
a PAH indicator of combustion (Bucheli et al.
2004
; Gogou et al.
2000
; Hwang et al.
2003
; Mostafa et al.
2009
; Takada et al.
1990
). Sometimes, BeP is not included in
the ʣCOMB expression (Bucheli et al.
2004
; Ou et al.
2004
). If BeP is added to the
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