Papers by Siwatt Pongpiachan
Marine Pollution Bulletin, 2013
Aerosol and Air Quality Research, 2009
Aerosol and Air Quality Research
ABSTRACT Shipping activities significantly contribute to global atmospheric pollutant emissions. ... more ABSTRACT Shipping activities significantly contribute to global atmospheric pollutant emissions. Numerous studies have used synchrotron X-ray fluorescence spectroscopy (SRXRF) to identify elemental species in atmospheric particles, yet few studies have applied this technique for assessing PM10-bound chemical species from shipping emissions. In this study, we conducted simultaneous sampling of PM10 at three air quality observation sites located close to Laem Chabang Sea Port (LCSP) from 24 May to 27 June 2020. The PM10 samples were then chemically characterised using SRXRF at the Beam Line 5.1 Wiggler (BL5.1W) in the Siam Photon Source, Synchrotron Light Research Institute (Nakhon Ratchasima, Thailand). We identified unique features in the SRXRF spectra of PM10 samples collected from the site adjacent to LCSP. The average percentage contributions of selected metals at LCSP occurred in the order of Fe > Cu > Te > As > Br > Kr > Mn > Cr > Ni > V > Ti > P > Se > S > Cl, which is in good agreement with the results of previous studies conducted in Bangkok. Although some previous studies highlight the importance of V/Fe as the diagnostic binary ratio that can be used as a chemical proxy for categorizing shipping related particles, this application can be problematic-particularly in the atmospheric environment with high contents of iron-rich dust aerosols. In stead of employing V/Fe, the diagnostic binary ratios of As/V and Se/V can be considered as alternative geochemical tracers for classifying shipping emissions associated aerosols. By applying the concept of enrichment factor (EF), Se is exceedingly enriched in all observatory sites indicating that industrial emissions were the dominant contributor of Se at the ambient air of Lam Chabang. Hierarchical cluster analysis (HCA) successfully classify a group of V, Ti, Ga, and Ni at all sampling sites, which may be caused by shipping activities coupled with industrial emissions.
Biomass Burning in South and Southeast Asia
Atmospheric Pollution Research
Arabian Journal of Geosciences
Organic carbon (OC) is the amount of carbon found in an organic compound. Once entered, the envir... more Organic carbon (OC) is the amount of carbon found in an organic compound. Once entered, the environment OC may cause climate change and effects on public health. The objective of the study was to assess the spatio-temporal trends of OC, climatology, and to develop inventories. The three satellite datasets (MACCity, ACCMIP, RCP 8.5) showed significant different trends in OC levels. Results indicated significantly higher trends in OC distribution during anthropogenic activities and the industrial era as compared with natural sources and the pre-industrial era. The residential and industrial sectors showed higher emission of OC 1.0 × 10−5to 2.5 × 102 Tg/year, respectively as compared with other sectors. Spatial distribution of OC revealed higher levels in bigger cities (Islamabad, Lahore, Karachi, Multan, Punch, and Mardan districts) of Pakistan. The temporal analysis shows irregular increasing trends in OC distribution with the passage of time. Principal component analysis (PCA) revealed that residential OC showed a positive correlation with surface temperature, wind and heat and OC transport, sum, residential, and energy sector with relative humidity in MACCity and RCP 8.5 datasets, respectively. The study indicated that savanna burning and residential sectors were a major contributor to the level of OC. The results will be helpful for the government to devise policies regarding OC management.
Aerosol and Air Quality Research
Arabian Journal of Geosciences
Polycyclic Aromatic Compounds
Atmospheric Pollution Research
Atmospheric Environment
Abstract A lack of information on the radiative effects of refractory black carbon (rBC) emitted ... more Abstract A lack of information on the radiative effects of refractory black carbon (rBC) emitted from biomass burning is a significant gap in our understanding of climate change. A custom-made combustion chamber was used to simulate the open burning of crop residues and investigate the impacts of rBC size and mixing state on the particles' optical properties. Average rBC mass median diameters ranged from 141 to 162 nm for the rBC produced from different types of crop residues. The number fraction of thickly-coated rBC varied from 53 to 64%, suggesting that a majority of the freshly emitted rBC were internally mixed. By comparing the result of observed mass absorption cross-section to that calculated with Mie theory, large light absorption enhancement factors (1.7–1.9) were found for coated particles relative to uncoated cores. These effects were strongly positively correlated with the percentage of coated particles but independent of rBC core size. We suggest that rBC from open biomass burning may have strong impact on air pollution and radiative forcing immediately after their production.
Data in Brief
The focus of this research was to present a data article associated with organic carbon (OC) and ... more The focus of this research was to present a data article associated with organic carbon (OC) and elemental carbon (EC) preserved in lake sediments. Descriptive statistics were applied in this dataset. Sediment cores were sliced immediately at the following layers: 0–20; 20–40; 40–60; 60–80; 80–100; 100–120; 120–140; 140–160; 160–180; 180–200; 200–220; 220–240; 240–260; 260–280; 280–300; 300–320; 320–340; 340–360; 360–380; 380–400; 440–460; 460–480; 480–500; 500–520; 520–540; 540–560 and 560–580 mm of depth. Chemical analysis of OC (i.e. OC1, OC2, OC3, OC4), EC (i.e. EC1, EC2, EC3), and the pyrolyzed organic carbon (OP) (i.e. OP1, OP2, OP3, OP4, OP5, OP6, Char, Soot) contents was conducted by using a DRI Model 2001 Thermal/Optical Carbon Analyzer. The chemical characterization coupled with statistical analysis reveal that vehicle exhausts are the most prominent factor governing OC/EC data detected in core sediments. These data underline some noticeable concerns associated with ecotoxicology and environmental safety of residents surrounding the Songkhla Lake.
Journal of Human Behavior in the Social Environment
The project output will assist with the strategic planning and determination of communication tac... more The project output will assist with the strategic planning and determination of communication tactics, coupled with public relations, to establish a good corporate image under fluctuating global circumstances. Questionnaires and non-experimental, in-depth interviews were used for both quantitative and qualitative research, respectively. The main objective of this study is to explore stakeholder attitudes and satisfaction with the creation of corporate images by Thailand's National Housing Authority (NHA). The investigation of NHA stakeholders' attitudes and comments toward the building of this government entity's corporate image strategy led to sustainable developments within the NHA by determining concepts and research methods, crafting a research plan, and identifying the characteristics of the target group. This study includes other sections related to measuring the attitude index, data collection and analysis, comparisons and interpretations of the target group and stakeholder perspectives. The target population is comprised of: Residents in 68 communities under the governance of NHA and Thai citizens, executive directors of the Ministry of Social Development and Human Security (MSDHS), board committee, executive directors, and general staff, companies, the private sector, entrepreneurs, and building contractors, public relations staff. Overall, 30 categories of stakeholders were interviewed. Secondary information, such as project documents, was collected and utilized for action planning, which reflects stakeholder opinions towards the NHA. The survey sample size of stakeholders was limited to 400 people from 12 districts, comprising 31,844 households under the 68 NHA projects in Bangkok. KEYWORDS National Housing Authority (NHA) of Thailand; corporate social responsibility (CSR); analysis of variance (ANOVA); Pearson analysis (PA); hierarchical cluster analysis (HCA); multiple linear regression analysis (MLRA); principal component analysis (PCA)
Asian Pacific Journal of Cancer Prevention, 2016
The reliability of using diagnostic binary ratios of particulate carcinogenic polycyclic aromatic... more The reliability of using diagnostic binary ratios of particulate carcinogenic polycyclic aromatic hydrocarbons (PAHs) as chemical tracers for source characterisation was assessed by collecting PM10 samples from various air quality observatory sites in Thailand. The major objectives of this research were to evaluate the effects of day and night on the alterations of six different PAH diagnostic binary ratios: An/(An + Phe), Fluo/(Fluo + Pyr), B[a]A/(B[a]A + Chry), B[a]P/(B[a]P + B[e]P), Ind/(Ind + B[g,h,i]P), and B[k]F/Ind, and to investigate the impacts of site-specific conditions on the alterations of PAH diagnostic binary ratios by applying the concept of the coefficient of divergence (COD). No significant differences between day and night were found for any of the diagnostic binary ratios of PAHs, which indicates that the photodecomposition process is of minor importance in terms of PAH reduction. Interestingly, comparatively high values of COD for An/(An + Phe) in PM10 collected from sites with heavy traffic and in residential zones underline the influence of heterogeneous reactions triggered by oxidising gaseous species from vehicular exhausts. Therefore, special attention must be paid when interpreting the data of these diagnostic binary ratios, particularly for cases of low-molecular-weight PAHs.
The Southeast Asian Journal of Tropical Medicine and Public Health, Mar 1, 2009
Triton X-114 (Triton X-114) surfactant separates into two isotropic phases at room temperature an... more Triton X-114 (Triton X-114) surfactant separates into two isotropic phases at room temperature and can be successfully used in cloud point extraction for the analysis of polycyclic aromatic hydrocarbons (PAHs). We studied which type of container is the most suitable for PAHs extraction with this method and how the water affects PAH recovery. We used a generator and mini-centrifuge with a cloud point method to determine pyrene levels in water in the field. An on-site thermostat can be used along with pouring hot water from a canteen into a plastic bucket to keep the temperature stable. Significant losses of pyrene due to adsorption onto the container wall can be minimized by storing water samples in glass containers. Variation in critical micelle concentration (cmc) can be avoided by bringing the water temperature to 40ºC for 5 minutes. These methods allowed pyrene to be determined in a remote tropical peat swamp area in Central Kalimantan, Indonesia.
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Papers by Siwatt Pongpiachan