7.9 Temporal Trends of PCDDs/Fs in Ambient Air in Seoul, Korea

摘要

The aim of this study was to determine dioxin levels and to assess temporal trends of the atmospheric content of these pollutants in Seoul. Moreover, patterns of PCDDs/Fs isomers have been investigated and the relationship between the level of dioxin in ambient air and seasonal fluctuation was investigated. Ambient air monitoring for dioxin in Seoul has been conducted continuously over the 7 years: January 2002 through December 2008. An estimated 450 samples in ambient air were collected by PUF air sampler and analyzed for PCDDs/Fs using HRGC-HRMS. I-TEQ values of dioxin in ambient air ranged from 22 to 563 fg I-TEQ/m~3 with a mean 142 fg I-TEQ/m~3. Our findings show that contemporary PCDDs/Fs levels in ambient air have declined since the 2002s. Special characteristics were found according to the seasonal changes. The PCDDs/Fs levels in this study were higher in the winter compared to the summer.