Partitioning of dioxins (PCDDs/Fs) in ambient air at urban residential locations|
Rahman, Md. M.; Shon, Z.H.; Ma, C.J.; Brown, R.J.C.; Pandey, S.K.; Park, C.G.; Bae, I.S.; Sohn, J.R.; Yoon, H.O. & Kim, K.H.
In this work, 17-polychlorinated dibenzo-p-dioxin/
furan (PCDD/Fs) isomers were measured in ambient
air at four urban sites in Seoul, Korea (from February to
June 2009). The concentrations of their summed values
(ΣPCDD/Fs) across all four sites ranged from 1,947 (271
WHO05 TEQ) (Jong Ro) to 2,600 (349 WHO05 TEQ) fg/
m3 (Yang Jae) with a mean of 2,125 (± 317) fg/m3 (292
WHO05 TEQ fg/m3). The sum values for the two isomer
groups of ΣPCDD and ΣPCDF were 527 (30 WHO05 TEQ)
and 1,598 (263 WHO05 TEQ) fg/m3, respectively. The
concentration profile of individual species was dominated
by the 2,3,4,7,8-PeCDF isomer, which contributed
approximately 36 % of the ΣPCDD/Fs value. The observed
temporal trends in PCDD/F concentrations were characterized
by relative enhancement in the winter and spring.
The relative contribution of different sources, when
assessed by principal component analysis, is explained by
the dominance of vehicular emissions along with coal (or
gas) burning as the key source of ambient PCDD/Fs in the
residential areas studied.
PCDD/Fs; Gas/particle partitioning; Residential area; Seasonal variation