Danai Tipmanee - Academia.edu (original) (raw)

Papers by Danai Tipmanee

PloS one, Mar 20, 2024

Based on the data of the State of Global Air (2020), air quality deterioration in Thailand has ca... more Based on the data of the State of Global Air (2020), air quality deterioration in Thailand has caused ~32,000 premature deaths, while the World Health Organization evaluated that air pollutants can decrease the life expectancy in the country by two years. PM 2.5 was collected at three air quality observatory sites in

Heliyon, Oct 1, 2022

The aim of this study is to determine potential sources and concentrations of polycyclic aromatic... more The aim of this study is to determine potential sources and concentrations of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) in surface soils devoted to different land uses in northwest Algeria. Microwaveassisted extraction (MAE) and gas chromatography/mass spectrometry (GC-MS) methods were applied to quantify 16 PAHs and 7 PCB congeners in surface soils. The sum of the 16 US-EPA priority PAHs and the 7 European indicator PCBs ranged from 133.7 to 2068.0 ng g −1 and from n.d. to 19.34 ng g −1 , respectively. PAHs with four to six fused rings were predominant in soils, and their concentrations ranged from 110.1 to 1768.0 ng g −1. Principal component analysis (PCA) and isomeric ratios showed that pyrogenic processes and petrogenic contributions were the main sources of PAHs, while commercial mixtures of PCBs (Aroclor 1254 and 1260) were sources of PCBs in urban/residential and industrial sites. This is a first screening of data about PAHs and PCBs in soils around a Mediterranean city (Oran, North Africa), and a first step toward a better understanding of the impact of anthropogenic activities on land uses.

Applied Environmental Research, Aug 1, 2022

Heavy metals in coastal sediments can adversely affect human health and the environment. The dist... more Heavy metals in coastal sediments can adversely affect human health and the environment. The distribution and metal bioavailability of Pb and Zn in 21 sediment samples collected from Phuket Bay, Phuket, Thailand using the first-two steps of sequential extraction proposed by the Standards, Measurements and Testing programme (known as BCR) was determined. The results showed that Pb formed weak complexes contributing up to 11.2% to 33% of its total concentration (1.7 to 7.5 mg kg-1) in the first fraction (BCR1), while Zn in the BCR1 fraction ranged from 4.9% to 9.9%. The results suggest that Pb could easily enter the food chain and the main cause of heavy metal contamination is related to local anthropogenic activities and effects of urbanization in the region, such as the ferry terminal, boatyards, and other maritime activities. Meanwhile, the enrichment factors of the metals showed minor to moderately severe enrichment. The metal concentration-depth relationship along the sediment profile showed metal concentration in each layer of the sediment core ranging from 45.4 to 88 mg Zn kg-1 and from 12.7 to 44.5 mg Pb kg-1. Based on the changes in heavy metal accumulation in the sediment core, and the calculated the enrichment factor versus depth, these allowed us to understand the historical variability in pollutant linked to past activities in Phuket Bay.

Molecules, Oct 26, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Source apportionment of polycyclic aromatic hydrocarbons in the terrestrial soils of King George Island, Antarctica

Journal of South American Earth Sciences, Dec 1, 2020

This study employed chemical characterisation to determine the source of polycyclic aromatic hydr... more This study employed chemical characterisation to determine the source of polycyclic aromatic hydrocarbons (PAHs) in the terrestrial soils of King George Island, Antarctica. The total concentrations of 12 PAHs in the samples of terrestrial soils collected at 44 sites ranged from 1.83 to 32.9 ng g−1 with an average value of 10.8 ± 8.22 ng g−1. The concentrations of these PAHs were relatively lower compared with those found in other studies in other locations. The spatial distributions of PAHs showed the highest concentrations to be in areas adjacent to the Great Wall Station and the road network, and light molecular weight PAHs were predominant. Three- and four-ring PAHs were the most abundant, representing 48.3% and 27.1% of the total, respectively. Although the binary diagnostic ratios indicated petrogenic sources as the main PAH-emission sources, principal components analysis and hierarchical cluster analysis suggested that electricity generators (22.84%) and light-duty gasoline (1...

Temporal Variation and Source Apportionment of PM2.5 Constituents in Phuket, Thailand

CRC Press eBooks, May 19, 2021

Science of The Total Environment, Mar 1, 2015

Biomass burning impacts on PM 2.5-bound PAHs were investigated in Northern Thailand. • Diagnostic... more Biomass burning impacts on PM 2.5-bound PAHs were investigated in Northern Thailand. • Diagnostic ratios/PCA plots show that biomass combustion is NOT a major PAH source. • Northern Thailand residents have a lower cancer risk than residents of world cities. • Direct ingestion is the major exposure pathway of PM 2.5-bound PAHs.

Aerosol and Air Quality Research, 2009

The presence of particle-associated polycyclic aromatic hydrocarbons (PAHs) was investigated in m... more The presence of particle-associated polycyclic aromatic hydrocarbons (PAHs) was investigated in mixed residential/light industrial, industrial and commercial zones in summer 2000 and winter 2001 in Tangshan, China. Thirteen PAHs were measured with the total average concentrations (ng/m 3) of PAHs ranged from 26.5 to 313.6 in summer and from 142.4 to 672.4 in winter. The average concentrations of ∑PAHs were 161.97 in summer and 326.80 in winter. PAH concentrations in mixed residential/light industrial zones were the lowest. Mixed residential/light industrial is a major land-use pattern in many cities in China. This study paid more attention to the source category in the mixed residential/light industrial zone. Particle PAH emissions may be contributed from industrial or domestic activities. Diagnostic ratio analysis, principal component analysis (PCA) and hierarchical clustering analysis (HCA) show major sources to be crude oil (by industrial activities mainly) in summer; and coal combustion (by domestic activities mainly) in winter. In addition, coal combustion was a principal source in the industrial zone. Traffic (combustion engine) was an important source in commercial zones. Finally, analysis by coefficient of divergence got similar results.

Social Science Research Network, 2022

The aim of this study is to determine potential sources and concentrations of polycyclic aromatic... more The aim of this study is to determine potential sources and concentrations of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) in surface soils devoted to different land uses in northwest Algeria. Microwaveassisted extraction (MAE) and gas chromatography/mass spectrometry (GC-MS) methods were applied to quantify 16 PAHs and 7 PCB congeners in surface soils. The sum of the 16 US-EPA priority PAHs and the 7 European indicator PCBs ranged from 133.7 to 2068.0 ng g −1 and from n.d. to 19.34 ng g −1 , respectively. PAHs with four to six fused rings were predominant in soils, and their concentrations ranged from 110.1 to 1768.0 ng g −1. Principal component analysis (PCA) and isomeric ratios showed that pyrogenic processes and petrogenic contributions were the main sources of PAHs, while commercial mixtures of PCBs (Aroclor 1254 and 1260) were sources of PCBs in urban/residential and industrial sites. This is a first screening of data about PAHs and PCBs in soils around a Mediterranean city (Oran, North Africa), and a first step toward a better understanding of the impact of anthropogenic activities on land uses.

Modification and validation of an analytical method for the simple determination of nitrate in seawater by reduction to nitrite with zinc powder

Marine Chemistry

Applied Environmental Research

Heavy metals in coastal sediments can adversely affect human health and the environment. The dist... more Heavy metals in coastal sediments can adversely affect human health and the environment. The distribution and metal bioavailability of Pb and Zn in 21 sediment samples collected from Phuket Bay, Phuket, Thailand using the first-two steps of sequential extraction proposed by the Standards, Measurements and Testing programme (known as BCR) was determined. The results showed that Pb formed weak complexes contributing up to 11.2% to 33% of its total concentration (1.7 to 7.5 mg kg-1) in the first fraction (BCR1), while Zn in the BCR1 fraction ranged from 4.9% to 9.9%. The results suggest that Pb could easily enter the food chain and the main cause of heavy metal contamination is related to local anthropogenic activities and effects of urbanization in the region, such as the ferry terminal, boatyards, and other maritime activities. Meanwhile, the enrichment factors of the metals showed minor to moderately severe enrichment. The metal concentration-depth relationship along the sediment pr...

Atmosphere

Previous studies have determined biomass burning as a major source of air pollutants in the ambie... more Previous studies have determined biomass burning as a major source of air pollutants in the ambient air in Thailand. To analyse the impacts of meteorological parameters on the variation of carbonaceous aerosols and water-soluble ionic species (WSIS), numerous statistical models, including a source apportionment analysis with the assistance of principal component analysis (PCA), hierarchical cluster analysis (HCA), and artificial neural networks (ANNs), were employed in this study. A total of 191 sets of PM2.5 samples were collected from the three monitoring stations in Chiang-Mai, Bangkok, and Phuket from July 2020 to June 2021. Hotspot numbers and other meteorological parameters were obtained using NOAA-20 weather satellites coupled with the Global Land Data Assimilation System. Although PCA revealed that crop residue burning and wildfires are the two main sources of PM2.5, ANNs highlighted the importance of wet deposition as the main depletion mechanism of particulate WSIS and car...

Atmospheric Environment, 2018

A lack of information on the radiative effects of refractory black carbon (rBC) emitted from biom... more 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.

Polycyclic Aromatic Compounds, 2015

Polycyclic Aromatic Hydrocarbons (PAHs) which their carcinogenic and mutative effects have been p... more Polycyclic Aromatic Hydrocarbons (PAHs) which their carcinogenic and mutative effects have been proved are one of the major categories of pollutants entering the marine environment. Due to their hydrophobic, lipophilic characteristics, they accumulate in the sediments of coastal areas. Khowre-Musa System as a semi enclosed ecosystem receives high levels of contamination due to its location in the vicinity of industrial sites. This study was performed to determine concentrations of PAHs in the sediments of three creeks (Khowre-Jafari, Khowre-Ahmadi and Khowre-Ghannam) from the Khowre-Musa System. A total of 27 samples (3creeks x 3sites per each creek x 3 composited samples per site) were collected. 10 PAHs (acenaphylene, acenaphthene, fluorene, anthracene, fluorathene, pyrene, chrysene, benzo(b) fluoranthene and benzo(a)pyrene) were detected in the sediment samples using HPLC. Total concentrations of PAHs values were highest at Khowre-Jafari site. Most of 10 selected PAHs concentrations were higher than standards. The results of the study suggest the petrochemical industry play most important role in the contamination of the study area.

Molecules, Oct 26, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

On the basis of the vulnerability-led approach, the Prevalent Community-level Vulnerability Index... more On the basis of the vulnerability-led approach, the Prevalent Community-level Vulnerability Index (PCVI) was developed as a simple composite index used to represent community-level vulnerability to climate change in the socioeconomic and hazard contexts. The PCVI consists of three major components which are Exposure & hazard, Socioeconomic-ecological fragility and Coping capacity. All of these components are further comprised of different indicators, representing different aspects of biophysical and social vulnerability of grass-root communities. Based on the results analyzed in the provincial pilot sites, the PCVI could represent both spatial patterns and magnitudes of vulnerability of each community in consistence with the local economic-social-environmental contexts. It generally reflects the differences in the local contexts and factors that determine overall vulnerability of each community. For the ease in calculating the PCVI especially for the provincial operating staffs and general public, the PREvalent Community Climate Change Vulnerability Tool (RECCC) was further developed as a user-friendly, Excel-based program. In conclusions, the outputs of this study that include the PCVI and its database as well as the RECCC program are useful not only for analyzing vulnerability and assessing risks of community to climate change, but also for supporting decision-making process in developing and implementing adaptation activities at provincial level. These outputs were also designed for further integrating as a supplementary part of Provincial's Decision Supporting System (DSS), with the purpose of promoting the participation of local organizations and stakeholders in coping with the adverse impacts of climate change. However, additional development of ERCCC program, together with dissemination of the vulnerability framework as well as the use of ERCCC program to local organizations needs to be continued.

Understanding the tsunami cycle requires a simple method for identification of tsunami backwash d... more Understanding the tsunami cycle requires a simple method for identification of tsunami backwash deposits. This study investigates Fourier transform infrared (FTIR) spectroscopy followed by careful analysis of variance (ANOVA), Gaussian distribution, hierarchical cluster analysis (HCA) and principal component analysis (PCA) for the discrimination of typical marine sediments and tsunami backwash deposits. In order to test the suitability of FTIR spectra as innovative methods for classifications of tsunami deposits, typical marine sediments and terrestrial soils were classified into three zones, namely zone-1 (i.e. typical marine sediments), zone-2 (i.e. including tsunami backwash deposits) and zone-3 (i.e. coastal terrestrial soils). HCA was performed to group the spectra according to their spectral similarity in a dendrogram and successfully separate FTIR spectra of all three sampling zones into two main clusters with five sub-clusters. The simplicifolious (i.e. single-leafed) type o...

Occupational exposure to hazards and volatile organic compounds in small-scale plastic recycling plants in Thailand by integrating risk and life cycle assessment concepts

Journal of Cleaner Production

Seasonal microplastic variations in estuarine sediments from urban canal on the west coast of Thailand: A case study in Phuket province

Marine Pollution Bulletin

To improve knowledge of the relationships of human activities with microplastic pollution in the ... more To improve knowledge of the relationships of human activities with microplastic pollution in the urban estuary in Phuket province, which has a densely populated city on the western coast of Thailand, a total of 463 plastic-like items from 24 sediment samples in the dry and the rainy seasons were identified by micro-Fourier transform infrared spectroscopy. The microplastic abundance ranged in 300-900 and 33-400 items/kg dry weight in the dry and the rainy seasons, respectively, indicating that the estuary is moderately contaminated with microplastics. The most abundant polymer types were rayon and polyester with colored fibers, suggesting that the microplastics deposited in this area originate mainly from washing effluents. Additionally, our findings show that the microplastic distribution is significantly governed by hydrodynamic energy in the estuary. This provides basic information for a better understanding of the fate of microplastics within estuary, and for management actions to address microplastics in urban estuary.

Ecotoxicological risk and health risk characterization of polycyclic aromatic hydrocarbons (PAHs) in terrestrial soils of King George Island, Antarctica

Polar Science

Abstract We studied the concentrations, characteristics, ecological risk, and health risk of 12 p... more Abstract We studied the concentrations, characteristics, ecological risk, and health risk of 12 probably carcinogenic polycyclic aromatic hydrocarbons (PAHs) in KGI soils of Antarctica. Measured concentrations of 12 PAHs ranged from 1.83 to 32.9 ng g−1 with an average of 11.9 ± 8.13 ng g−1. The assessment of ecological risks used methods that were based on total toxicity equivalency concentrations (TEQs) and a risk quotient (RQ), which can be used to sensitively and accurately assess ΣPAHs. The results indicated that PAHs in the soils of KGI presented a low risk level to living organisms in the soil and to plants. The low molecular weight PAHs presented a much greater ecological risk than high molecular weight PAHs in KGI soils, and the levels of these ecological risks were classified as low compared to those of previous studies in other areas. The total values of incremental lifetime cancer risk (ILCR) for children and adults were 2.34 × 10−8 and 1.73 × 10−8, respectively. Soil samples from KGI that were contaminated with PAHs still exhibited risks that were much lower than that of the baseline value. The results of this investigation provide a database for contamination evaluation, risk assessment of ecological and human health in PAH-contaminated sites.

PloS one, Mar 20, 2024

Based on the data of the State of Global Air (2020), air quality deterioration in Thailand has ca... more Based on the data of the State of Global Air (2020), air quality deterioration in Thailand has caused ~32,000 premature deaths, while the World Health Organization evaluated that air pollutants can decrease the life expectancy in the country by two years. PM 2.5 was collected at three air quality observatory sites in

Heliyon, Oct 1, 2022

The aim of this study is to determine potential sources and concentrations of polycyclic aromatic... more The aim of this study is to determine potential sources and concentrations of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) in surface soils devoted to different land uses in northwest Algeria. Microwaveassisted extraction (MAE) and gas chromatography/mass spectrometry (GC-MS) methods were applied to quantify 16 PAHs and 7 PCB congeners in surface soils. The sum of the 16 US-EPA priority PAHs and the 7 European indicator PCBs ranged from 133.7 to 2068.0 ng g −1 and from n.d. to 19.34 ng g −1 , respectively. PAHs with four to six fused rings were predominant in soils, and their concentrations ranged from 110.1 to 1768.0 ng g −1. Principal component analysis (PCA) and isomeric ratios showed that pyrogenic processes and petrogenic contributions were the main sources of PAHs, while commercial mixtures of PCBs (Aroclor 1254 and 1260) were sources of PCBs in urban/residential and industrial sites. This is a first screening of data about PAHs and PCBs in soils around a Mediterranean city (Oran, North Africa), and a first step toward a better understanding of the impact of anthropogenic activities on land uses.

Applied Environmental Research, Aug 1, 2022

Heavy metals in coastal sediments can adversely affect human health and the environment. The dist... more Heavy metals in coastal sediments can adversely affect human health and the environment. The distribution and metal bioavailability of Pb and Zn in 21 sediment samples collected from Phuket Bay, Phuket, Thailand using the first-two steps of sequential extraction proposed by the Standards, Measurements and Testing programme (known as BCR) was determined. The results showed that Pb formed weak complexes contributing up to 11.2% to 33% of its total concentration (1.7 to 7.5 mg kg-1) in the first fraction (BCR1), while Zn in the BCR1 fraction ranged from 4.9% to 9.9%. The results suggest that Pb could easily enter the food chain and the main cause of heavy metal contamination is related to local anthropogenic activities and effects of urbanization in the region, such as the ferry terminal, boatyards, and other maritime activities. Meanwhile, the enrichment factors of the metals showed minor to moderately severe enrichment. The metal concentration-depth relationship along the sediment profile showed metal concentration in each layer of the sediment core ranging from 45.4 to 88 mg Zn kg-1 and from 12.7 to 44.5 mg Pb kg-1. Based on the changes in heavy metal accumulation in the sediment core, and the calculated the enrichment factor versus depth, these allowed us to understand the historical variability in pollutant linked to past activities in Phuket Bay.

Molecules, Oct 26, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Source apportionment of polycyclic aromatic hydrocarbons in the terrestrial soils of King George Island, Antarctica

Journal of South American Earth Sciences, Dec 1, 2020

This study employed chemical characterisation to determine the source of polycyclic aromatic hydr... more This study employed chemical characterisation to determine the source of polycyclic aromatic hydrocarbons (PAHs) in the terrestrial soils of King George Island, Antarctica. The total concentrations of 12 PAHs in the samples of terrestrial soils collected at 44 sites ranged from 1.83 to 32.9 ng g−1 with an average value of 10.8 ± 8.22 ng g−1. The concentrations of these PAHs were relatively lower compared with those found in other studies in other locations. The spatial distributions of PAHs showed the highest concentrations to be in areas adjacent to the Great Wall Station and the road network, and light molecular weight PAHs were predominant. Three- and four-ring PAHs were the most abundant, representing 48.3% and 27.1% of the total, respectively. Although the binary diagnostic ratios indicated petrogenic sources as the main PAH-emission sources, principal components analysis and hierarchical cluster analysis suggested that electricity generators (22.84%) and light-duty gasoline (1...

Temporal Variation and Source Apportionment of PM2.5 Constituents in Phuket, Thailand

CRC Press eBooks, May 19, 2021

Science of The Total Environment, Mar 1, 2015

Biomass burning impacts on PM 2.5-bound PAHs were investigated in Northern Thailand. • Diagnostic... more Biomass burning impacts on PM 2.5-bound PAHs were investigated in Northern Thailand. • Diagnostic ratios/PCA plots show that biomass combustion is NOT a major PAH source. • Northern Thailand residents have a lower cancer risk than residents of world cities. • Direct ingestion is the major exposure pathway of PM 2.5-bound PAHs.

Aerosol and Air Quality Research, 2009

The presence of particle-associated polycyclic aromatic hydrocarbons (PAHs) was investigated in m... more The presence of particle-associated polycyclic aromatic hydrocarbons (PAHs) was investigated in mixed residential/light industrial, industrial and commercial zones in summer 2000 and winter 2001 in Tangshan, China. Thirteen PAHs were measured with the total average concentrations (ng/m 3) of PAHs ranged from 26.5 to 313.6 in summer and from 142.4 to 672.4 in winter. The average concentrations of ∑PAHs were 161.97 in summer and 326.80 in winter. PAH concentrations in mixed residential/light industrial zones were the lowest. Mixed residential/light industrial is a major land-use pattern in many cities in China. This study paid more attention to the source category in the mixed residential/light industrial zone. Particle PAH emissions may be contributed from industrial or domestic activities. Diagnostic ratio analysis, principal component analysis (PCA) and hierarchical clustering analysis (HCA) show major sources to be crude oil (by industrial activities mainly) in summer; and coal combustion (by domestic activities mainly) in winter. In addition, coal combustion was a principal source in the industrial zone. Traffic (combustion engine) was an important source in commercial zones. Finally, analysis by coefficient of divergence got similar results.

Social Science Research Network, 2022

The aim of this study is to determine potential sources and concentrations of polycyclic aromatic... more The aim of this study is to determine potential sources and concentrations of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) in surface soils devoted to different land uses in northwest Algeria. Microwaveassisted extraction (MAE) and gas chromatography/mass spectrometry (GC-MS) methods were applied to quantify 16 PAHs and 7 PCB congeners in surface soils. The sum of the 16 US-EPA priority PAHs and the 7 European indicator PCBs ranged from 133.7 to 2068.0 ng g −1 and from n.d. to 19.34 ng g −1 , respectively. PAHs with four to six fused rings were predominant in soils, and their concentrations ranged from 110.1 to 1768.0 ng g −1. Principal component analysis (PCA) and isomeric ratios showed that pyrogenic processes and petrogenic contributions were the main sources of PAHs, while commercial mixtures of PCBs (Aroclor 1254 and 1260) were sources of PCBs in urban/residential and industrial sites. This is a first screening of data about PAHs and PCBs in soils around a Mediterranean city (Oran, North Africa), and a first step toward a better understanding of the impact of anthropogenic activities on land uses.

Modification and validation of an analytical method for the simple determination of nitrate in seawater by reduction to nitrite with zinc powder

Marine Chemistry

Applied Environmental Research

Heavy metals in coastal sediments can adversely affect human health and the environment. The dist... more Heavy metals in coastal sediments can adversely affect human health and the environment. The distribution and metal bioavailability of Pb and Zn in 21 sediment samples collected from Phuket Bay, Phuket, Thailand using the first-two steps of sequential extraction proposed by the Standards, Measurements and Testing programme (known as BCR) was determined. The results showed that Pb formed weak complexes contributing up to 11.2% to 33% of its total concentration (1.7 to 7.5 mg kg-1) in the first fraction (BCR1), while Zn in the BCR1 fraction ranged from 4.9% to 9.9%. The results suggest that Pb could easily enter the food chain and the main cause of heavy metal contamination is related to local anthropogenic activities and effects of urbanization in the region, such as the ferry terminal, boatyards, and other maritime activities. Meanwhile, the enrichment factors of the metals showed minor to moderately severe enrichment. The metal concentration-depth relationship along the sediment pr...

Atmosphere

Previous studies have determined biomass burning as a major source of air pollutants in the ambie... more Previous studies have determined biomass burning as a major source of air pollutants in the ambient air in Thailand. To analyse the impacts of meteorological parameters on the variation of carbonaceous aerosols and water-soluble ionic species (WSIS), numerous statistical models, including a source apportionment analysis with the assistance of principal component analysis (PCA), hierarchical cluster analysis (HCA), and artificial neural networks (ANNs), were employed in this study. A total of 191 sets of PM2.5 samples were collected from the three monitoring stations in Chiang-Mai, Bangkok, and Phuket from July 2020 to June 2021. Hotspot numbers and other meteorological parameters were obtained using NOAA-20 weather satellites coupled with the Global Land Data Assimilation System. Although PCA revealed that crop residue burning and wildfires are the two main sources of PM2.5, ANNs highlighted the importance of wet deposition as the main depletion mechanism of particulate WSIS and car...

Atmospheric Environment, 2018

A lack of information on the radiative effects of refractory black carbon (rBC) emitted from biom... more 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.

Polycyclic Aromatic Compounds, 2015

Polycyclic Aromatic Hydrocarbons (PAHs) which their carcinogenic and mutative effects have been p... more Polycyclic Aromatic Hydrocarbons (PAHs) which their carcinogenic and mutative effects have been proved are one of the major categories of pollutants entering the marine environment. Due to their hydrophobic, lipophilic characteristics, they accumulate in the sediments of coastal areas. Khowre-Musa System as a semi enclosed ecosystem receives high levels of contamination due to its location in the vicinity of industrial sites. This study was performed to determine concentrations of PAHs in the sediments of three creeks (Khowre-Jafari, Khowre-Ahmadi and Khowre-Ghannam) from the Khowre-Musa System. A total of 27 samples (3creeks x 3sites per each creek x 3 composited samples per site) were collected. 10 PAHs (acenaphylene, acenaphthene, fluorene, anthracene, fluorathene, pyrene, chrysene, benzo(b) fluoranthene and benzo(a)pyrene) were detected in the sediment samples using HPLC. Total concentrations of PAHs values were highest at Khowre-Jafari site. Most of 10 selected PAHs concentrations were higher than standards. The results of the study suggest the petrochemical industry play most important role in the contamination of the study area.

Molecules, Oct 26, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

On the basis of the vulnerability-led approach, the Prevalent Community-level Vulnerability Index... more On the basis of the vulnerability-led approach, the Prevalent Community-level Vulnerability Index (PCVI) was developed as a simple composite index used to represent community-level vulnerability to climate change in the socioeconomic and hazard contexts. The PCVI consists of three major components which are Exposure & hazard, Socioeconomic-ecological fragility and Coping capacity. All of these components are further comprised of different indicators, representing different aspects of biophysical and social vulnerability of grass-root communities. Based on the results analyzed in the provincial pilot sites, the PCVI could represent both spatial patterns and magnitudes of vulnerability of each community in consistence with the local economic-social-environmental contexts. It generally reflects the differences in the local contexts and factors that determine overall vulnerability of each community. For the ease in calculating the PCVI especially for the provincial operating staffs and general public, the PREvalent Community Climate Change Vulnerability Tool (RECCC) was further developed as a user-friendly, Excel-based program. In conclusions, the outputs of this study that include the PCVI and its database as well as the RECCC program are useful not only for analyzing vulnerability and assessing risks of community to climate change, but also for supporting decision-making process in developing and implementing adaptation activities at provincial level. These outputs were also designed for further integrating as a supplementary part of Provincial's Decision Supporting System (DSS), with the purpose of promoting the participation of local organizations and stakeholders in coping with the adverse impacts of climate change. However, additional development of ERCCC program, together with dissemination of the vulnerability framework as well as the use of ERCCC program to local organizations needs to be continued.

Understanding the tsunami cycle requires a simple method for identification of tsunami backwash d... more Understanding the tsunami cycle requires a simple method for identification of tsunami backwash deposits. This study investigates Fourier transform infrared (FTIR) spectroscopy followed by careful analysis of variance (ANOVA), Gaussian distribution, hierarchical cluster analysis (HCA) and principal component analysis (PCA) for the discrimination of typical marine sediments and tsunami backwash deposits. In order to test the suitability of FTIR spectra as innovative methods for classifications of tsunami deposits, typical marine sediments and terrestrial soils were classified into three zones, namely zone-1 (i.e. typical marine sediments), zone-2 (i.e. including tsunami backwash deposits) and zone-3 (i.e. coastal terrestrial soils). HCA was performed to group the spectra according to their spectral similarity in a dendrogram and successfully separate FTIR spectra of all three sampling zones into two main clusters with five sub-clusters. The simplicifolious (i.e. single-leafed) type o...

Occupational exposure to hazards and volatile organic compounds in small-scale plastic recycling plants in Thailand by integrating risk and life cycle assessment concepts

Journal of Cleaner Production

Seasonal microplastic variations in estuarine sediments from urban canal on the west coast of Thailand: A case study in Phuket province

Marine Pollution Bulletin

To improve knowledge of the relationships of human activities with microplastic pollution in the ... more To improve knowledge of the relationships of human activities with microplastic pollution in the urban estuary in Phuket province, which has a densely populated city on the western coast of Thailand, a total of 463 plastic-like items from 24 sediment samples in the dry and the rainy seasons were identified by micro-Fourier transform infrared spectroscopy. The microplastic abundance ranged in 300-900 and 33-400 items/kg dry weight in the dry and the rainy seasons, respectively, indicating that the estuary is moderately contaminated with microplastics. The most abundant polymer types were rayon and polyester with colored fibers, suggesting that the microplastics deposited in this area originate mainly from washing effluents. Additionally, our findings show that the microplastic distribution is significantly governed by hydrodynamic energy in the estuary. This provides basic information for a better understanding of the fate of microplastics within estuary, and for management actions to address microplastics in urban estuary.

Ecotoxicological risk and health risk characterization of polycyclic aromatic hydrocarbons (PAHs) in terrestrial soils of King George Island, Antarctica

Polar Science

Abstract We studied the concentrations, characteristics, ecological risk, and health risk of 12 p... more Abstract We studied the concentrations, characteristics, ecological risk, and health risk of 12 probably carcinogenic polycyclic aromatic hydrocarbons (PAHs) in KGI soils of Antarctica. Measured concentrations of 12 PAHs ranged from 1.83 to 32.9 ng g−1 with an average of 11.9 ± 8.13 ng g−1. The assessment of ecological risks used methods that were based on total toxicity equivalency concentrations (TEQs) and a risk quotient (RQ), which can be used to sensitively and accurately assess ΣPAHs. The results indicated that PAHs in the soils of KGI presented a low risk level to living organisms in the soil and to plants. The low molecular weight PAHs presented a much greater ecological risk than high molecular weight PAHs in KGI soils, and the levels of these ecological risks were classified as low compared to those of previous studies in other areas. The total values of incremental lifetime cancer risk (ILCR) for children and adults were 2.34 × 10−8 and 1.73 × 10−8, respectively. Soil samples from KGI that were contaminated with PAHs still exhibited risks that were much lower than that of the baseline value. The results of this investigation provide a database for contamination evaluation, risk assessment of ecological and human health in PAH-contaminated sites.