Bara Scientific Co.

Bang Rak, Thailand

Bara Scientific Co.

Bang Rak, Thailand

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Pongpiachan S.,National Institute of Development Administration | Pongpiachan S.,CAS Institute of Earth Environment | Hattayanone M.,Prince of Songkla University | Suttinun O.,Prince of Songkla University | And 4 more authors.
Atmospheric Pollution Research | Year: 2017

The ". Loy Krathong" festival is a major annual Thai event that includes firework displays. It takes place on the evening of the full moon in the 12th month of the traditional Thai lunar calendar. Since fireworks are widely considered a major source of PAHs, it is considered reasonable to expect a significant increase in PAH levels during this event. The overall PAH profile at the six air quality observatories operated by the Pollution Control Department (PCD), Ministry of Natural Resources and Environment (MNRE), showed that the Kingdom of Thailand's atmosphere was dominated by 5-6-ring PAHs during the firework display period. A significant increase in ΣPAHs (153%) was observed during firework displays. A statistical analysis coupled with the application of diagnostic binary PAH ratios was conducted to determine whether the detected increase in PAH congeners during the festival period was due to firework combustion or whether it was a coincidental effect caused by vehicular exhausts, long-range atmospheric transportation, photolysis and chemical degradation. The average incremental lifetime cancer risk (ILCR) values of adults and children living in Bangkok as estimated by three different TEQs for ingestion, dermal contact, and inhalation exposure pathways were greatly lesser than the US EPA baseline, further highlighting that the cancer risk of bonfire night falls into the ''acceptable level'' range. © 2017 Turkish National Committee for Air Pollution Research and Control.


Pongpiachan S.,National Institute of Development Administration | Pongpiachan S.,CAS Institute of Earth Environment | Thumanu K.,111 University Avenue | Na Pattalung W.,111 University Avenue | And 4 more authors.
Journal of Analytical Methods in Chemistry | Year: 2012

This paper focuses on providing new results relating to the impacts of Diurnal variation, Vertical distribution, and Emission source on sulfur K-edge XANES spectrum of aerosol samples. All aerosol samples used in the diurnal variation experiment were preserved using anoxic preservation stainless cylinders (APSCs) and pressure-controlled glove boxes (PCGBs), which were specially designed to prevent oxidation of the sulfur states in PM Further investigation of sulfur K-edge XANES spectra revealed that PMsamples were dominated by S(VI), even when preserved in anoxic conditions. The Emission source effect on the sulfur oxidation state of PMwas examined by comparing sulfur K-edge XANES spectra collected from various emission sources in southern Thailand, while Vertical distribution effects on the sulfur oxidation state of PMwere made with samples collected from three different altitudes from rooftops of the highest buildings in three major cities in Thailand. The analytical results have demonstrated that neither Emission source nor Vertical distribution appreciably contribute to the characteristic fingerprint of sulfur K-edge XANES spectrum in PM © 2012 Siwatt Pongpiachan et al.


Pongpiachan S.,National Institute of Development Administration | Choochuay C.,National Institute of Development Administration | Chonchalar J.,National Institute of Development Administration | Kanchai P.,National Institute of Development Administration | And 7 more authors.
Asian Pacific Journal of Cancer Prevention | Year: 2013

Along with rapid economic growth and enhanced agricultural productivity, particulate matter emissions in the northern cities of Thailand have been increasing for the past two decades. This trend is expected to continue in the coming decade. Emissions of particulate matter have brought about a series of public health concerns, particularly chronic respiratory diseases. It is well known that lung cancer incidence among northern Thai women is one of the highest in Asia (an annual age-adjusted incidence rate of 37.4 per 100,000). This fact has aroused serious concern among the public and the government and has drawn much attention and interest from the scientific community. To investigate the potential causes of this relatively high lung cancer incidence, this study employed Fourier transform infrared spectroscopy (FTIR) transmission spectroscopy to identify the chemical composition of the PM2.5 collected using Quartz Fibre Filters (QFFs) coupled with MiniVolTM portable air samplers (Airmetrics). PM2.5 samples collected in nine administrative provinces in northern Thailand before and after the "Haze Episode" in 2013 were categorised based on three-dimensional plots of a principal component analysis (PCA) with Varimax rotation. In addition, the incremental lifetime exposure to PM2.5 of both genders was calculated, and the first derivative of the FTIR spectrum of individual samples is here discussed.


Pongpiachan S.,National Institute of Development Administration | Tipmanee D.,Chulalongkorn University | Khumsup C.,Bara Scientific Co. | Kittikoon I.,Bara Scientific Co. | Hirunyatrakul P.,Bara Scientific Co.
Science of the Total Environment | Year: 2015

To investigate the potential cancer risk resulting from biomass burning, polycyclic aromatic hydrocarbons (PAHs) bound to fine particles (PM2.5) were assessed in nine administrative northern provinces (NNP) of Thailand, before (N-I) and after (N-II) a haze episode. The average values of σ3,4-ring PAHs and B[a]PEquivalent concentrations in world urban cities were significantly (p<0.05) much higher than those in samples collected from northern provinces during both sampling periods. Application of diagnostic binary ratios of PAHs underlined the predominant contribution of vehicular exhaust to PM2.5-bound PAH levels in NNP areas, even in the middle of the agricultural waste burning period. The proximity of N-I and N-II values in three-dimensional (3D) principal component analysis (PCA) plots also supports this conclusion. Although the excess cancer risk in NNP areas is much lower than those of other urban area and industrialized cities, there are nevertheless some concerns relating to adverse health impacts on preschool children due to non-dietary exposure to PAHs in home environments. © 2014 Elsevier B.V.


Pongpiachan S.,National Institute of Development Administration | Settacharnwit T.,National Institute of Development Administration | Chalangsut P.,National Institute of Development Administration | Hirunyatrakul P.,Bara Scientific Co. | Kittikoon I.,Bara Scientific Co.
WIT Transactions on Ecology and the Environment | Year: 2012

The purpose of this paper is to describe the natural disasters of flooding and coastal erosion in Thailand, which have resulted in many deaths and large-scale property damage. The magnitude and frequency of Thailand's flooding in the past and the present are also examined. The MIKE 11 and URSB hydrological models are shown to be the most suitable models for forecasting floods in Thailand, as well as for planning short and long term protection and mitigation measures. With its long length of coastline on both the Gulf of Thailand and the Andaman Sea, Thailand faces the increasing occurrence of coastal erosion. The major causes of coastal erosion originate from both natural processes and human activities. A simulation of a rise in sea level by incremental degrees and their potential impact on some major cities in Southeast Asia is described and measures to mitigate and limit the negative impact of coastal erosion are presented in order to preserve the environment for future generations. © 2012 WIT Press.


Pongpiachan S.,National Institute of Development Administration | Supadit T.,National Institute of Development Administration | Hirunyatrakul P.,Bara Scientific Co. | Kittikoon I.,Bara Scientific Co. | Whangthamrongwit S.,Bara Scientific Co.
WIT Transactions on Ecology and the Environment | Year: 2012

One of the most controversial issues on air pollution field is how to quantitatively identify the emission source of gaseous species in atmospheric environment. Air Compass Software was carefully designed for this special purpose by using C# program. Given that wind direction is measured as an angle (α) relative to true north (0), mean direction was determined by using trigonometric relations to determine the direction of the resultant of individual wind vectors. The emission source strength - wind direction relationship can be represented graphically by plotting R-value of (natural logarithm of partial pressure) vs. against downwind angle (α) during the monitoring period. To apply this relationship, measured atmospheric concentrations must be expressed as partial pressures (P), which can be converted through the use of the ideal gas law with a temperature correction. The aims of this study are to statistically quantify the relationships between emission source strengths and downwind angles of Semi-Volatile Organic Compounds (SVOCs) measured at Whitbourne monitoring stations adjacent to Worcester city, UK from 20/11/2003 to 22/12/2003 (cold-period) and from 5/5/2004 to 26/5/2004 (warm-period). Air compass software proves that emission source strengths of each gaseous species can be significantly influenced by seasons. © 2012 WIT Press.


Pongpiachan S.,National Institute of Development Administration | Thumanu K.,111 University Avenue | Kositanont C.,Chulalongkorn University | Schwarzer K.,Institute of Geosciences Sedimentology | And 3 more authors.
Journal of Analytical Methods in Chemistry | Year: 2012

This paper aims to enhance the credibility of applying the sulfur K-edge XANES spectroscopy as an innovative fingerprint for characterizing environmental samples. The sensitivities of sulfur K-edge XANES spectra of ten sulfur compound standards detected by two different detectors, namely, Lytle detector (LyD) and Germanium detector (GeD), were studied and compared. Further investigation on self-absorption effect revealed that the maximum sensitivities of sulfur K-edge XANES spectra were achieved when diluting sulfur compound standards with boron nitride (BN) at the mixing ratio of 0.1. The particle-size effect on sulfur K-edge XANES spectrum sensitivities was examined by comparing signal-to-noise ratios of total suspended particles (TSP) and particulate matter of less than 10 millionths of a meter (PM 10) collected at three major cities of Thailand. The analytical results have demonstrated that the signal-to-noise ratios of sulfur K-edge XANES spectra were positively correlated with sulfate content in aerosols and negatively connected with particle sizes. The combination of hierarchical cluster analysis (HCA) and principal component analysis (PCA) has proved that sulfur K-edge XANES spectrum can be used to characterize German terrestrial soils and Andaman coastal sediments. In addition, this study highlighted the capability of sulfur K-edge XANES spectra as an innovative fingerprint to distinguish tsunami backwash deposits (TBD) from typical marine sediments (TMS). © 2012 Siwatt Pongpiachan et al.


PubMed | Bara Scientific Co., National Institute of Development Administration and Chulalongkorn University
Type: | Journal: The Science of the total environment | Year: 2015

To investigate the potential cancer risk resulting from biomass burning, polycyclic aromatic hydrocarbons (PAHs) bound to fine particles (PM2.5) were assessed in nine administrative northern provinces (NNP) of Thailand, before (N-I) and after (N-II) a haze episode. The average values of 3,4-ring PAHs and B[a] P Equivalent concentrations in world urban cities were significantly (p<0.05) much higher than those in samples collected from northern provinces during both sampling periods. Application of diagnostic binary ratios of PAHs underlined the predominant contribution of vehicular exhaust to PM2.5-bound PAH levels in NNP areas, even in the middle of the agricultural waste burning period. The proximity of N-I and N-II values in three-dimensional (3D) principal component analysis (PCA) plots also supports this conclusion. Although the excess cancer risk in NNP areas is much lower than those of other urban area and industrialized cities, there are nevertheless some concerns relating to adverse health impacts on preschool children due to non-dietary exposure to PAHs in home environments.

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