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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