(주)에이피엠엔지니어링

A Study on the Characteristics of PM1.0 and source of organic components 

during summertime at Seoul and Baengnyeong Island

abstract

This study aims to identify the characteristics and origin of chemical composition of PM1.0 in the atmosphere, which

is particle smaller than the fine particle (PM2.5). Baengnyeong Island on the west sea and Seoul that represents inland

city areas were selected and the characteristics of the two points in summer, June, 2014, were compared. The mean

concentration of PM1.0 in Baengnyeong Island was average 14.3 μg/m3 and that is Seoul in the same period was 22.4 μg/

m3, which was about 1.6 times higher than Baengnyeong Island. The chemical components in PM1.0, sulfate was

predominant with 48% in Baengnyeong Island while organic component was highest with 39% in Seoul. Diurnal patterns

of PM1.0 chemical components at Seoul site, the highest nitrate concentration are observed in the early morning hours

before sunrise and then decrease during the daytime. Typically, organic and sulfate concentrations are increased in the

afternoon as a form of secondary organic and secondary sulfate at the urban area. H/C, O/C, N/C, and OM/OC ratios

of Baengnyeong Island were found to be 1.46, 0.70, 0.012, and 2.08, respectively while Seoul showed 1.54, 0.39, 0.007,

and 1.67, respectively. The oxidation level of organic component was high at Baengnyeong, but the volatility level was

high at Seoul site. The PMF analysis resolved two organic sources including POA (primary organic aerosol) and SOA

(Secondary oragnic aerosol). POA and SOA ratios of Baengnyeong Island were found to be 20% and 80% while Seoul

showed 25% and 75% respectively.

Sources: Journal of the Korean Society of Urban Environment 2017 Vol. 17