황사에 의한 대기중 PCDD/DFs의 기여에 관한 연구

Abstract

This study was carried out to investigate the variation and distributive characteristics of Polychlorinated Dibenzo-p-dioxins and Polychlorinated Dibenzofurans in the ambient air during Asian dust period. The ambient air samples which were collected at Pukyong national university (PKNU) in Busan from March 2006 to April 2006 have three types ; total suspended particles (TSP), fine particles which the diameter is less than 10㎛ (PM10), and gaseous phases (PUF). Total PCDD/Fs concentrations of particles and gaseous phase were ranged 3.47-13.14 pg/m³ and 0.56-2.23 pg/m³, respectively. In addition, WHO-TEQ concentration of TSP were 0.04-0.16 WHO-TEQ pg/m³. The contamination level of PCDDs/DFs in ambient air in Busan was sligtly lower than datas of other domestic area and countries. The PCDDs/DFs levels in the ambient air which were sampled from Asian dust period showed higher values than non-Asian dust periods. Asian dust changed profile patterns of PCDD/DFs. Firstly, It changed concentration ratio of PCDD/DFs between gaseous phase and particle phase and also caused variation of isomer ratio as follows. Levels of PCDD were increased. On the other hand, level of PCDF were decreased. Secondly, It changed homologue patterns of PCDD/DFs TCDFs was the largest contributor at the rate of 25-30% of total concentration of PCDD/DFs homologue during non-Asian dust period. On the other hand, OCDD having the rate of 20-50% was higher than TCDFs