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Prevalence of Microplastics in Coastal Area of Samae San, Thailand and Its Possible Source
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Researchers examined microplastic abundance, morphology, and polymer composition across multiple environmental matrices in Samae San, Thailand, including soil near a dumping site, road dust, beach sand, and sediment, finding the highest concentration of 93,734.3 items per kilogram dry weight at the dumping site soil.
This research explored the abundance, morphology, and polymer composition of microplastics (MPs) in various environmental samples within the Samae San subdistrict involving surface soil nearby the dumping site, road dust soil, beach sand and sediment in the area with distinct land- based activities. Dumping site soil exhibited the highest concentration in items per kg of dry weight at 93,734.3, followed by road dust soil (573.0 ± 583.7), beach sand (99.8 ± 75.3), and sediment (83.1 ± 50.4). Morphological traits revealed similarities between transparent fiber-shaped particles in beach sands and sediment, and those in nearby road dust soil, while green sheet-shaped particles dominated in dumping site soil. Predominant polymer types included PE, PET, and PP, associated with daily plastics, fishing gear, and fishing nets. In beach sand and sediment samples, transparent polyamide (nylon) fibers shaped like microplastics (MPs) were notably observed, as it is a common material used in fishing nets. Cluster analysis indicated a resemblance between MPs in beach sand, sediment, and nearby road dust soil, implying that plastic debris, comprising single-use plastics and fishing equipment, could be a potential source of MPs in coastal areas.
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Microplastic pollution in surface seawater and beach sand from the shore of Rayong province, Thailand: Distribution, characterization, and ecological risk assessment
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Researchers surveyed microplastic pollution in beach sand and seawater along Rayong province, Thailand, finding average concentrations of 339 particles per kilogram in sand and 1,781 particles per cubic meter in seawater, with polyethylene as the most common polymer type.
Microplastics on beaches along the eastern Gulf of Thailand – A preliminary study
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Researchers quantified microplastics at the high-tide line of 21 beaches along the eastern Gulf of Thailand, finding highly variable contamination levels ranging from 420 to over 200,000 particles per kilogram of sand.
Contamination and characteristics of microplastics in recreation beach sediment of the western part of the inner Gulf of Thailand
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Researchers assessed microplastic contamination in beach sediments at a recreation site, finding plastic particles of varying shapes and colors that reflect inadequate waste management and runoff from multiple pollution sources.
Occurrence and distribution of microplastics in surface sediments from the Gulf of Thailand
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Researchers investigated the distribution and characteristics of microplastics in surface sediments across the Gulf of Thailand, finding an average abundance of 150.4 pieces/kg dry weight with fragment shapes dominating, and observed a correlation between sediment grain size and microplastic content. The results establish baseline contamination data for this Southeast Asian coastal region.
Land-use influence on soil microplastic pollution in Thailand: Implications for sustainable land management
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Soil microplastic concentrations across seven land-use types in Thailand ranged widely, with roadside soils averaging 7,467 particles per kilogram — roughly 75 times higher than cassava fields. The findings highlight how traffic-related wear and road runoff are among the most intense sources of microplastic soil contamination, with implications for food crops grown near roads.
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