Environmental Engineering Reference
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Fig. 10
The ratio of
methylalkylated PAHs of PA1 to their parents
. See Fig.
9
for the symbols and
to the text for explanation
for combustion samples, too (Fig.
10
; Yunker et al.
2002
). Accordingly, PA1/PA0 < 1
indicates the combustion of coal or wood, or weathered urban aerosols. The PA1/
PA0 ratio is lower (<0.2) in creosotes or coal tar than in any other pyrogenic or
petrogenic sources (Fig.
10
) and seems appropriate for differentiating creosotes or
coal tar from other sources (Fig.
10
).
According to Yan et al. (
2005
), further study is required to fully exploit the
potential of the PA1/PA0 ratio for pyrogenic PAH source apportionment. PA1/PA0
should preferably be used along with other ratios such as (see also Sect.
5.8
): alkyl/
ʣPAH, FP1/FP0, Ring456/TPAH (Yan et al.
2005
). For petroleum products, Yunker
et al. (
2002
) assumed that the PA1/PA0 ratio is more reliable than the P0/A0 ratio,
especially if the latter has a value close to 9.
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