| 摘要: | In this study, the chemical characteristics and sources of aerosol at Doi Ang Khang, Chiang Mai, Northern Thailand during 23 February to 7 April 2013, corresponding to the monsoonal dry season and a maximum in agricultural and forest fire activity, were determined. The aerosol samples were collected on 47 mm quartz filters by using MOUDI and Nano MOUDI, and then carried out the chemical properties of the carboxylic acids, inorganic components (NO3-, NO2-, Cl-, SO42-, Mg2+, Na+ , K+, Ca2+ and NH4+) and carbonaceous matters (OC and EC) in aerosols. Acetic acid was the most abundant carboxylic acid, followed by oxalic acid during an intensive observation period (IOP), indicating that carboxylic acid are formed by photochemical reaction and/or emitted directly from fossil fuel and biomass burning. Sulfate and ammonium were the most dominant species of anion and cation, respectively. Potassium was found to be useful marker for biomass burning. In this study, oxalate and potassium were highly correlated (relationship coefficient, r value> 0.947), suggesting source of aerosol from biomass burning. |
