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61,005 resultsShowing papers similar to Microplastic abundance in the semi-enclosed Osaka Bay, Japan
ClearMicroplastics Survey in Osaka Bay
Researchers measured microplastic density at two locations in Osaka Bay in September and December 2019, finding peak concentrations of 4.1 particles per cubic meter after heavy rainfall — far exceeding 2015 reference levels — with seasonal variation in particle types including artificial turf and fertilizer capsules.
Microplastic volumes in Tokyo Bay
Researchers quantified microplastic volumes across multiple sites in Tokyo Bay, Japan, finding spatial variation linked to urban runoff and river inputs, with surface waters and sediments showing distinct accumulation patterns.
A Field Investigate on Curent Status of Microplastic Pollution on Sandy Beaches of Osaka Bay, Japan
Researchers investigated microplastic pollution on sandy beaches across Osaka Bay, Japan, sampling 13 coastal sites and finding concentrations ranging from 50 to 9,500 particles per square meter with most accumulation above the maximum monthly high-tide line. The study found that the innermost areas of the bay had markedly higher contamination, averaging 253-313 particles per square meter compared to a bay-wide mean of 52 particles per square meter.
An integrated assessment of microplastic pollution in coastal surface water and sediment of Japan
Researchers conducted a comprehensive survey of microplastic pollution across 14 coastal locations around Japan from Hokkaido to Okinawa, measuring concentrations of 288.7 g/km2 in surface water and 1,185 kg/km2 in sediment and characterizing polymer types, shapes, and size distributions.
Comprehensive Understanding of Microplastics Inflow Off the Coast of Funabashi
Researchers conducted continuous monitoring of microplastic (MP) contamination in rivers, sewage, and coastal waters around Funabashi in Tokyo Bay, finding that MP number densities showed high temporal variability and a gradual decreasing trend, with upstream river sources driving contamination that diminished toward the sea as particles settled into bottom sediments, while sewage was also implicated as a contributor to marine MP pollution.
Contamination of sea surface water offshore the Tokai region and Tokyo Bay in Japan by small microplastics
Surface water off the Tokai region and within Tokyo Bay, Japan, was sampled with a nested net system distinguishing small microplastics (under 350 micrometers) from larger microplastics. Small microplastic concentrations were 20 to 60 times higher than larger ones, with concentrations up to 5,900 pieces per cubic meter in Tokyo Bay's inner waters.
Microplastics contamination in tidelands of the Osaka Bay area in western Japan
Researchers surveyed microplastic contamination in the mudflats of four Osaka Bay tidelands in Japan, finding that concentrations in sediment increased with proximity to urban areas, and detected microplastics in 10% of bivalves, 6.7% of crabs, and in the stomach of a tufted duck. The results suggest biomagnification potential in the food web, with higher-order predators potentially accumulating greater microplastic loads in tideland ecosystems near cities.
An Integrated Assessmentof Microplastic Pollutionin Coastal Surface Water and Sediment of Japan
Researchers conducted an integrated assessment of microplastic pollution in coastal surface water and sediment around Japan, providing a comprehensive dataset that clarifies the extent of contamination in Japanese coastal areas previously lacking systematic monitoring data.
Microplastics on the sea surface of the semi-closed Tokyo Bay
Researchers surveyed microplastic pollution in Tokyo Bay using neuston nets in May 2019 and January 2020, finding average abundances of 3.98 pieces per square metre with polyethylene fragments dominating, and identifying river inputs as the primary source based on matching seasonal abundance patterns between riverine and inner bay samples.
Microplastics Occurrence in Surface Waters and Sediments in Five River Mouths of Manila Bay
Researchers documented microplastic contamination in water and sediments at five river mouths of Manila Bay in the Philippines, finding fragments and fibers as the dominant types, with polyethylene and polypropylene the most common polymers.
Survey on Microplastics and Macroscopic Floating Garbage in River, Coasts, and Estuary in the Eastern Part of Takamatsu City, Japan
Researchers surveyed microplastics and macroscopic floating litter in rivers, coasts, and estuaries in eastern Takamatsu City, Japan, finding PE and PP dominated microplastics in both river and coastal environments, and that plastic fragments, bags, and cigarette butts were the most common macro-litter items with distribution influenced by wind and wave conditions.
High-Resolution Mapping of Japanese Microplastic and Macroplastic Emissions from the Land into the Sea
Researchers developed a high-resolution method to map microplastic and macroplastic emissions from Japanese river catchments into the sea, using correlations between observed river concentrations and basin characteristics such as urban area ratio and population density to generate nationwide plastic emission estimates.
Microplastics in the tropical Northwestern Pacific Ocean and the Indonesian seas
Researchers measured microplastic abundance in the tropical Northwestern Pacific and Indonesian seas, finding very low concentrations in open-ocean currents but an order of magnitude higher levels in the Indonesian straits due to river runoff and current convergence patterns.
Current Status and Issues of Microplastic Pollution Research
This Japanese review summarized microplastic research in river and ocean environments, including national estimates of plastic discharged from Japan's rivers to the sea and microplastic distribution in Tokyo Bay. The paper also reviewed current analytical methods and their limitations for measuring small microplastic particles.
Microplastics in the sediments of small-scale Japanese rivers: Abundance and distribution, characterization, sources-to-sink, and ecological risks
Researchers characterized microplastic pollution in sediments of four small-scale Japanese rivers, finding widespread contamination and identifying polymer types and potential sources, highlighting that even small river systems serve as microplastic transport pathways.
Occurrence, distribution, and possible sources of microplastics in the surface river water in the Arakawa River watershed
Researchers investigated the occurrence, distribution, and potential sources of microplastics in surface river water along the Arakawa River watershed running through the Tokyo Metropolitan area, contributing to data on microplastic contamination in populated urban freshwater systems.
Microplastics in urban wastewater and estuarine water: Importance of street runoff
Microplastics ranging from 10 micrometers to 5 mm were measured in untreated sewage, treated sewage, highway runoff, and estuarine water in Tokyo during dry and wet weather. Particles smaller than 200 micrometers made up more than 60% of total microplastic counts across all sample types, with highway runoff identified as a significant contributor.
Characteristics of Microplastics and Macro-sized Coastal Debris on the Beaches of the Eastern Takamatsu City, Japan
A beach survey in eastern Takamatsu, Japan found that the beach near a large urban river mouth had higher concentrations of both microplastics and macro-litter than a more remote beach, with polyethylene dominating at one site and polystyrene at the other. Most litter items were less than six months old, suggesting rapid accumulation from nearby sources rather than long-range ocean transport.
Occurrence and distribution of plastic particles (10–25,000 μm) and microfibers in the surface water of an urban river network in Japan
This study assessed the occurrence and distribution of plastic particles (10-25,000 micrometers) and microfibers in the surface water of an urban river network in Japan, finding that plastic abundance was closely tied to urban land use and proximity to discharge points.
Microplastic in three urban estuaries, China
Researchers surveyed three urban estuaries in China and found microplastics throughout, with concentrations and types reflecting the combined influence of surrounding city density, stormwater runoff, and tidal mixing.
Spatiotemporal variations of surface water microplastics near Kyushu, Japan: A quali-quantitative analysis
Researchers conducted six surveys over 14 months at nine stations near Kyushu, Japan, identifying 6,131 microplastic items with an average abundance of 0.49 items per square meter and average size of 1.71 mm. Spatiotemporal variability was high, with the greatest differences between sampling locations exceeding differences between seasons.
A Microplastic Pollution Hotspot: Elevated Levels in Sediments from the San Francisco Bay Area
Sediment samples from San Francisco Bay revealed elevated microplastic concentrations across sites, with polymer types and morphologies consistent with local urban runoff and atmospheric deposition sources.
Measurement, quantification, and potential risk of microplastics in the mainstream of the Pearl River (Xijiang River) and its estuary, Southern China
Microplastic distribution was surveyed across the mainstream and estuary of China's Pearl River, finding higher concentrations near urban centers and establishing a detailed inventory of microplastic abundance, polymer types, and potential sources in this major waterway.
Assessment of the sources and inflow processes of microplastics in the river environments of Japan
Researchers mapped microplastic concentrations across 29 Japanese rivers and found plastic particles present at 31 of 36 sampling sites. The concentrations were strongly linked to urbanization and population density, confirming that human activities in river basins are a major driver of freshwater microplastic pollution. The findings demonstrate that significant plastic fragmentation occurs before debris reaches the ocean, making rivers an important area for pollution monitoring.