Author(s)

K. Thumanu, S. Pongpiachan, K. F. Ho, S. C. Lee & P. Sompongchaiyakul

Abstract

PM10 samples were collected at nine sampling stations using a high volume (hivol) air sampler during the period of June–November 2007. Using the ATRFTIR technique, the chemical compositions of organic and water-soluble ionic species (WSIS) PM10 aerosols from each emission source were identified. WSIS such as SO4 2-, NO3 -, CO3 2- , NH4 + were mainly found in PM10 aerosols. The highest concentrations of NO3 -, NH4 + and CO3 2- were detected in aerosols collected from sampling sites adjacent to traffic roads. This can be explained by the heterogeneous reaction of SO2/NO2 mixtures with carbon soot that lead to the highest contribution of WSIS in combustion particles from vehicle exhausts. In addition, the ratios of organic carbon/elemental carbon (OC/EC) collected at heavy traffic road, bus terminal and traffic demonstrated the lowest values of

Keywords

PM₁₀, ATR-FTIR, organic carbon, elemental carbon, water-soluble ionic species, organic functional group, secondary organic carbon, XANES