도로변 대기 중 Polychlorinated biphenyls(PCBs)의 profile과 가스-입자상 분배특성

Abstract

The profile patterns and characteristic of gaseous-particulate partitioning of polychlorinated biphenyls(PCBs) in ambient air from roadside were studied. The samples were collected for 2 weeks, September 19~26th, and December 9~16th in 2012.. High volume air samplers and bulk deposition sampler was used for sampling. The particulate were separately gathered with total suspended partile(TSP) and PM10 by particle size. The results of total PCBs showed the levels of 1.08∼13.73 pg/m3 of TSP and 12.6∼60.13 pg/m3 for PUF samples. The levels of PM10 were 0.38∼9.11 pg/m3 and deposition flux had calculated at 16,044.54 pg/m2/day. The comparative data about total PCBs at contrasting points showed that 0.44∼5.87 pg/m3 for TSP, 9.31∼46.45 pg/m3 for PUF and 0.242∼7.99 pg/m3 for PM10, respectively. Furthermore the deposition flux in was 1,764.49 pg/m2/day at contrasting points. The concentrations of dioxin-like PCBs applying WHO-TEF value were 0.006∼6.43 fg/m3 for TSP, 0.004∼2.74 fg/m3 for PUF and 0.31∼5.69 fg/m3 for PM10, respectively, at the roadside. The results at the contrasting site ranged 0.547∼10.204 fg/m3 for TSP, 0.005∼1.794 fg/m3 for PUF and 0.001∼3.764 fg/m3 for PM10, respectively. The profile patterns at the both case had similar patterns showing low chlorinate PCBs, from mono to were tetra-CBs, are dominant compounds. According to gaseous-particulate partitioning result, low chlorinated PCBs are distributed in gaseous phases, however high chlorinated PCBs are mainly in particulate phases. From these results, the temperature is considered a main factor which influences gaseous-particulate behaviors of PCBs. To figure out the behavior of pollutant in the environment, adsorptive partitioning model by Junge-Pankow and partitioning model using Octanol-air partitioning coefficient are mainly used. The result by Junge-Pankow model suggest that the research points near the road were primarily urban type. However the contrasting station is located in the middle of rural and urban type. All research points had contents of organic matter over 30% from the result of octanol-air partition coefficients(Koa) absorption model. The value from the roadside was over 30%, however the contents from the contrastiong points were relatively 10~20%. From this study, the gaseous-particulate behavior of PCBs is influenced by temperature. Futhermore, PCBs in ambient air in downtown area are mainly affected by the pollutant from roads and thoroughfares. keywords : PCBs , Roadside, Profile, Distribution, Partitioning