Assessment of reliability when using diagnostic binary ratios of Polycyclic Aromatic Hydrocarbons in Ambient Air PM10

Authors

ดร.ศิวัช พงษ์เพียจันทร์

Published

Asian Pacific Journal of cancer Prevention

Abstract

The reliability of using diagnostic binary ratios of particulate carcinogenic polycyclic aromatic
hydrocarbons(PAHs) as chemical tracers for source characterisation was assessed by collecting
PM10 samples from various air quality observatory sites in Thailand.

The major objectives of this research were to evaluate the effects of day and night on the
alterations of six different PAH diagnostic binary ratios: An (An + Phe), Fluo/(Fluo + Pyr),
B[a]A/(B[a]A + Chry), B[a]P/(B[a]P + B[e]P), Ind/(Ind + B[g,h,i]P), and B[k]F/Ind, and to
investigate the impacts of site-specific conditions on the alterations of PAH diagnostic
binary ratios by applying the concept of the coefficient of divergence (COD).
No significant differences between day and night were found for any of the
diagnostic binary ratios of PAHs, which indicates that the photodecomposition process
is of minor importance in terms of PAH reduction. Interestingly, comparatively high
values of COD for An (An + Phe) in PM10 collected from sites with heavy traffic and in
residential zones underline the influence of heterogeneous reactions triggered by
oxidising gaseous species from vehicular exhausts. Therefore, special attention must
be paid when interpreting the data of these diagnostic binary ratios, particularly for
cases of low-molecular weight PAHs.

(2015). Assessment of reliability when using diagnostic binary ratios of Polycyclic Aromatic Hydrocarbons in Ambient Air PM10 . Asian Pacific Journal of cancer Prevention, 16(16), 100-120.