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Articles by Siwatt Pongpiachan
Total Records ( 3 ) for Siwatt Pongpiachan
  Siwatt Pongpiachan , Shinji Kudo and Kazuhiko Sekiguchi
  Four Organic Carbon (OC) compositions and three Elemental Carbon (EC) fractions in PM10 collected monthly from February to December 2007 at eight PCD air quality observatory sites were analysed by using a DRI Model 2001. Since both OC and EC play a major role in governing the gas-particle partitioning of carcinogenic Polycyclic Aromatic Hydrocarbons (PAHs), it is therefore, important to investigate the spatial and temporal distributions of carbonaceous fractions in Bangkok. The sum of OC (ΣOC) and EC (ΣEC) collected at eight PCD sites were 71.4±19.3 μg m-3 and 74.9±32.7 μg m-3, correspondingly. The relatively low OC/EC ratios observed in Bangkok highlight the influence of transportation sector in governing carbonaceous aerosols, particularly in heavy traffic congestion area. Three-dimensional plots of Principal Components (PCs) successfully discriminate “traffic emission” group from those of “urban residential background” group. In addition, the estimated Incremental Lifetime Particulate Exposure (ILPE) of carbonaceous compositions were constantly highest at heavy traffic congestion area in both genders with the average values of 1,130±457 and 622±252 mg for TC accumulated in male and female, respectively.
  Siwatt Pongpiachan , Kin Fai Ho and Junji Cao
  Carbonaceous compositions, water-soluble ionic species and trace gaseous species were identified and quantified in Hat-Yai city, Thailand. All samples were collected every 3 h consecutively from 21 h December 17th to 21 h December 20th at Site 1 (30 m agl), Site 2 (60 m agl) and Site 3 (125 m agl). The averaged concentration of OC was significantly higher at the Site 1 than those detected at Site 2 and 3 suggesting that anthropogenic activities at ground level might play a major role in governing air quality at ground level. The morning peak of carbonaceous compositions observed during the sampling period of 6-9 emphasized the main contribution of traffic emissions on OC/EC contents in Hat-Yai city. In this study, it was found that aged maritime aerosols from long-range transportation and/or biomass burning particles overwhelmed carbonaceous aerosols at the top of building. Whilst hierarchical cluster analysis and Pearson correlation analysis show some considerable influences of night-time tourism activities on carbonaceous contents at ground level, principal component analysis highlights the impacts of maritime aerosols, biomass burning and possibly agricultural waster burning particles at higher atmospheric layer.
  Siwatt Pongpiachan
  Organic functional groups of alcohol, alkane, alkene, alkyl halide, alkyne, amine, aromatic, ether, nitrile and nitro in PM2.5 were qualitatively identified by using FTIR techniques with the assistances of IRAffinity-1 Shimadzu. The PM2.5 were collected at the city center, sub-urban and rural area of Chiang-Mai city, Thailand during the haze episode in March 2012. The measured concentrations of PM2.5 at three air quality observatory sites were relatively high in comparison with those of other cities around the world during the agricultural waste-burning period. The predicted probabilistic Incremental Lifetime Cancer Risk (ILCR) of PM2.5 were consistently highest at the city center in both genders with the average values of 418±180 and 228±98 year-1 for PM2.5 accumulated in male and female outdoor workers over exposure duration of 25 years, respectively. This indicates the influences of vehicular exhausts on the enhanced contents of PM2.5 irrespective of the “Haze Episode”. The results are in good agreement with those obtained from FTIR technique.
 
 
 
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