DSpace-CRIS

Now showing 1 - 2 of 2

Some of the metrics are blocked by your
consent settings
First evidence of microplastics in atmospheric deposition over the Gulf of Thailand: Distribution, characteristics, and ecological risk
(2026-09-15)
Chinfak, Narainrit
;
Gunasekaran, Kannan
;
Jandang, Suppakarn
;
Li, Qipei
;
Sricharoenvech, Piyaporn
Microplastics (MPs) have been extensively studied in aquatic environments; however, their occurrence in atmospheric deposition remains poorly understood. This study provides the first insights into the distribution of MPs in wet deposition across different locations and evaluates their potential environmental risks in the Gulf of Thailand (GoT). The ocean is likely a sink for MPs, with approximately 10% of the total MPs in atmospheric deposition detected in oceanic rainwater. MP abundances in terrestrial rainwater, including urban and agricultural rainwater (62.70 ± 15.89 items/m2 and 29.37 ± 12.29 items/m2, respectively) were significantly higher than those in the GoT rainwater (9.72 ± 3.70 items/m2) ( p = 0.001), with greater MPs abundance observed in the urban center. MPs exhibited similar morphological (shape and color) and compositional characteristics across all locations. Fibrous MPs (100–500 μm) dominated urban (42%) and agricultural (55%) rainwater, whereas smaller fibers (<100 μm) were predominant in the GoT (69%). White and black were the dominant colors found in both terrestrial and GoT rainwater. Low-density polymers (PE, PP and PS) were the most frequently detected polymers, comprising up to 80% of the total MPs. Among them, PE was predominant, accounting for 48%, 51%, and 62% of all MPs identified in urban, agriculture and the GoT rainwater, respectively. Ecological risk assessment indicated a minor potential ecological risk associated with MPs in wet deposition. Future studies investigating both wet and dry deposition, as well as factors influencing MP distribution and transport in the GoT, are needed to support transport modeling, identify potential sources, and assess the impact of climate forcing on MP distribution.
Some of the metrics are blocked by your
consent settings
Distribution and chemical composition of atmospheric aerosols over the Gulf of Thailand during the southwest monsoon
(2026-05-01)
Kayee, Jariya
;
Sompongchaiyakul, Penjai
;
Das, Reshmi
;
Wang, Xianfeng
;
Chinfak, Narainrit
Marine aerosols were collected over the Gulf of Thailand (GOT) during the 2018 southwest monsoon on board the M.V. SEAFDEC2 while sailing. Water-soluble inorganic ions (i.e., Na+, NH<inf>4</inf>+, K+, Mg2+, Ca2+, Cl−, NO<inf>3</inf>−, and SO<inf>4</inf>2−) and elemental concentrations (i.e., Al, As, Ba, Ca, Cd, Cu, Cr, Fe, Mg, Mn, Na, Ni, Pb, Sr, V, and Zn) were determined to investigate their distribution patterns in order to evaluate the influence of particle sources on the chemical properties of atmospheric aerosols. During the southwest monsoon, the wind predominantly blows over the Indian Ocean to the GOT. Correspondingly, our results indicated that coarse particles are dominated by sea salts. Cl− and Na+ are the major ions, accounting for ∼64.8% (range: 51.2–84.3%) of total ions in the coarse mode particles. The strong correlation between Cl− and Na+ ( r = 0.999) along with the Cl/Na ratio (1.5, range: 0.66–2.00) suggest sea salt origin. Enrichment factor (EF) values indicate that elements are originated from oceanic, crustal, and anthropogenic sources. The oceanic source (Sr, Ca, Mg and Na) explains 95% (range: 81–99%) of total elements in the aerosols. Elements such as Al, Fe, Mn and Ba explain 4.6% of the total elements. These elements associate with the crustal source. Only a minimal amount (0.63%, range: 0.02–4.5%) of the total elements is originated from anthropogenic activities over or nearby the GOT as shown by loading of As, Cd, Cu, Cr, Ni, Pb, V and Zn.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results