Hygroscopic Properties of Fine Particulate Matter on Sub-Urban Upper Northern Thailand

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Thitima Rungratanaubon
Vichaya Sutum
Surat Bualert


This study investigated the hygroscopic properties of fine particulate matter. The samples analyzed byusing H-TDMA (HygroscopicTandem Differential Mobility Analyzer).Thehygroscopic growth rate of particles are recorded in the form of size under dry and humid condition. Six particle sizes are examined including 30, 50, 100, 150, 200, and 250 nm under dry condition with 29% relative humidity and under vapor-humid condition in Water Chamber with 87% relative humidity. The studied area is a locationof BanSunKong School, Mae Chan District, in ChiangRai Province. Study inthe summer during the24-26 March2559. Sampling collectionarea isopenspaceof thestudents' activities.Thesurrounding area is the commercial and heavy traffic. This study, hygroscopic growth factor distributionsof particles dispersed in the atmosphere's Gf found that particles dispersion separated into two groups: Less hygroscopic and More hygroscopic. The Gf valueof Less hygroscopic group is less than 1.01, while Gf valueof More hygroscopic is more than 1.01. The study found that the hygroscopic growth rate of fine particulate matter are in the groups of Less hygroscopic properties and water absorption rate was less because of the fine particulate matter that generated from the burning fuel.


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