Suspended microplastics during a tidal cycle in sea-surface waters around Chao Phraya River mouth, Thailand

Sukhsangchan, Roochira; Keawsang, Rangsiwut; Worachananant, Suchai; Thamrongnāwāsawat, Thō̜n; Phaksopa, Jitraporn

doi:10.2306/scienceasia1513-1874.2020.091

Cited by 19 publications

(9 citation statements)

References 35 publications

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“…Inconsistent results were identified in these studies concerning the impacts of spring/neap tide and flood/ebb tide on the MP concentration in the water or sediment phase. For instance, Sukhsangchan et al reported neap tide to have a greater abundance of MPs compared to spring tide in surface water near a river mouth, whereas Sadri and Thompson found that more MPs were observed in the surface water during spring tides. Wu et al found MPs to be more abundant in the surface sediment layer in the neap tide compared to in the spring tide, where the concentration of MPs exhibited a negative correlation with hydrological forces in an estuary.…”

Section: Introductionmentioning

confidence: 99%

Transport of Microplastics in Shore Substrates over Tidal Cycles: Roles of Polymer Characteristics and Environmental Factors

Feng

Chen

Greer

et al. 2022

Environ. Sci. Technol.

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Tidal zones providing habitats are particularly vulnerable to microplastic (MP) pollution. In this study, the effects of tidal cycles on the transport of MPs (4–6 μm polyethylene, PE1; 125 μm polyethylene, PE2; and 5–6 μm polytetrafluoroethylene, PFTE) in porous media combined with various environmental and MPs properties were systemically investigated. The results indicated that smaller substrate sizes exhibited higher retention percentages compared to those of larger substrate sizes under different tidal cycles. In terms of the size of MPs, a larger size (same density) was found to result in enhanced retention of MPs in the column. As the number of tidal cycles increased, although the transport of MPs from the substrate to the water phase was enhanced, PE1 was washed out more with the change in water level, compared to PTFE. Additionally, more MPs were retained in the column with the increase of salinity and the decrease of flow velocity under the same tidal cycles. Ultraviolet and seawater aged PE1 showed enhanced transport, while aged PTFE showed enhanced retention under the same tidal cycles. These results can help understand the MP behaviors in the shoreline environment and provide support for future cleanup and sampling in tidal zones.

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Section: Introductionmentioning

confidence: 99%

Transport of Microplastics in Shore Substrates over Tidal Cycles: Roles of Polymer Characteristics and Environmental Factors

Feng

Chen

Greer

et al. 2022

Environ. Sci. Technol.

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“…During the past few years, several studies on microplastics in marine ecosystem have been conducted in Thailand, with the focus on marine organisms [34,35], estuarine environments [36,37], and ocean sediment [38]. Despite this, the accumulation of ingested microplastics in fish has been less emphasized [39].…”

Section: Introductionmentioning

confidence: 99%

Presence and Characterization of Microplastics in Coastal Fish around the Eastern Coast of Thailand

et al. 2021

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Marine microplastic has been in the limelight recently. This study aimed to describe microplastic types ingested by 274 fish from Thailand’s eastern coast in 2020 and to compare the microplastic content among different feeding traits. The microplastics in the gastrointestinal tracts and gills were extracted, analyzed, and identified using FT-IR spectroscopy. Approximately 13.14% of the total specimen ingested microplastics, with an average of 0.14 items per individual. The detection frequency of microplastics was relatively high compared with other regions in Thailand but relatively low compared to global standards. Of the microplastic contaminated specimens, 56.41% had at least one piece of microplastic in their gastrointestinal tract. Pelagic (14.47%) species were found to have ingested more microplastics than the demersal (12.63%) group. Dominant aspects found included PET (as in polymers), fiber (as in shape), and black (as in color). However, microplastic numbers fluctuated with the size, weight, and feeding behavior of fish. This result suggested that the pelagic has a higher exposure risk and microplastic ingestion in relatively small quantities in a range of fish species. Our results indicated that the occurrence of microplastics in fish is not influenced by organism habitat or trophic level, although the characteristics of pelagic fish might significantly increase the chance of exposure to microplastics in pelagic species.

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“…Tidal current velocity was found to vary greatly for different sites and changes between neap and spring tides. For instance, some previous studies reported that tidal velocities ranged between 0.01 to approximately 1 m/s. − This can be expected to lead to different rates of change to the water table. Figure d–f demonstrates the effects of water table fluctuation velocity on MP movement in the substrate.…”

Section: Resultsmentioning

confidence: 99%

New Perspective on the Mobilization of Microplastics through Capillary Fringe Fluctuation in a Tidal Aquifer Environment

Feng

Chen

et al. 2023

Environ. Sci. Technol.

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The presence of plastic fragments in the environment is a growing global concern. In this study, we explored the effects of dynamic fluctuations of capillary fringe on the transport of microplastics (MPs) in the substrate combining various environmental and MP properties. Both experimental and Hydrus-2D modeling results confirmed that increasing cycles of water table fluctuation led to the rise of capillary fringe. An increase in the cycles of water table fluctuations did not significantly change the overall MP retention percentages in 0.5 mm substrate but altered the MP distribution along the column. In 1 and 2 mm substrate, the increase in cycle numbers enhanced the MP transport from substrate to the water below. In terms of the size of the MPs, more 20−25 μm polyethylene (PE2) were retained in the substrate compared to 4−6 μm polyethylene (PE1) under the same number of fluctuation cycles. High-density polytetrafluoroethylene (PTFE, 5−6 μm) exhibited higher retention percentages compared to PE1 particles. Ultraviolet aging for 60 days enhanced PE1 transport along the column, while 60 days of seawater aging did not affect PE1 transport greatly. For PTFE, ultraviolet and seawater aging enhanced its retention in the substrate. The retention percentages of both PE1 and PTFE in the column increased with the elevated ionic strength and the decrease of fluctuation velocity. This work highlights that capillary fringe fluctuation can serve as a pathway to relocate MPs to the tidal aquifer.

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Suspended microplastics during a tidal cycle in sea-surface waters around Chao Phraya River mouth, Thailand

Cited by 19 publications

References 35 publications

Transport of Microplastics in Shore Substrates over Tidal Cycles: Roles of Polymer Characteristics and Environmental Factors

Transport of Microplastics in Shore Substrates over Tidal Cycles: Roles of Polymer Characteristics and Environmental Factors

Presence and Characterization of Microplastics in Coastal Fish around the Eastern Coast of Thailand

New Perspective on the Mobilization of Microplastics through Capillary Fringe Fluctuation in a Tidal Aquifer Environment

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