서울시 초미세먼지(PM2.5) 중 중금속 특성 연구

임윤석·조석주·박창호·이용민·조성호·노승근·김정연·어수미

Study on characteristics of heavy metals in PM2.5 of Seoul, Korea.

Atmospheric Measurement and Management Team

Yun-seok Im, Seog-ju Cho, Chang-ho Park, Yong-min Lee, Sung-ho Cho, Seung-geun Rho, Jung-yeon Kim and Soo-mi Eo

Abstract

Ambient concentrations of trace metals in PM2.5 in spring(2016. 5. 12.~2016. 6. 16.) in Seoul area have been measured using a near-real time trace metal analyzer and characteristics of their concentrations in a haze episode have been investigated. The mean concentration of total 23 types of trace metals was 1.23 ug/m3, which is about 4% of PM2.5 mass concentration(30.80 ug/m3). Among trace metals, sum of Si, K, Fe concentrations attributes to 83% of total trace metal concentration. To investigate the characteristics of heavy metal concentrations in haze episode, the concentrations of trace metals in haze episode were compared with those in days where, PM2.5 concentrations were lower than mean PM2.5 concentration(30.80 ug/m3) and it showed the concentrations of Se, As, Cr, Pb, Zn, Mn in haze increased  5.1~2.78 times, which were higher than the increase ratio of PM2.5 mass concentration(2.63times). These trace metals are related to anthropogenic sources such as coal combustions or steel mill process. From the Conditional Probability Function(CPF) analysis with wind direction, high concentrations of these trace metals in haze episode are associated with industrial complexes in southeast and northeast directions.

Key words : PM2.5, Trace metals,