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distinguish pyrogenic (≈0.3) from petrogenic (≈4) sources (Bucheli et al.
2004
). If
multiple sources influence the P1/P0 ratio, then the FP1/FL0 ratio can be used to
detect anthropogenic inputs (Gustafsson
1997
; Pereira et al.
1999
and references
therein); in such cases, an FP1/FL0 > 1 indicates petroleum contamination. However,
such ratios (e.g., FP1/FL0) may be influenced by weathering (Neff et al.
2005
).
Ratios of FP1/FP0 < 1 (Fig.
13
) are said to indicate combustion (Yunker et al.
2002
). Saha et al. (
2009
) used a more conservative upper FP1/FP0 value of 0.5 for
Fig. 13
The ratio of
FP1
/
FP0
for different sources.
Degradation arrow
drawn assuming that par-
ent PAHs are less stable than their alkylated homologues. See Fig.
9
for the symbols and the text
for explanation
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