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Dynamics of microplastic abundance under tidal fluctuation in Musi estuary, Indonesia
Summary
This first study of microplastic dynamics under tidal influence in the Musi River Estuary, Indonesia, found that particle abundance fluctuated with flood and ebb tides, with tidal forcing shaping microplastic transport across estuarine zones.
Tidal dynamics contribute to fluctuations in microplastic abundance (MPs). This is the first study to characterize MPs under the influence of tidal fluctuations in the Musi River Estuary. MPs samples were collected during flood and ebb tides at 10 research stations representing the inner, middle and outer parts of the Musi River Estuary. MPs were extracted to identify the shape, color and size. MP abundances were 467.67 ± 127.84 particles/m during flood tide and 723.67 ± 112.05 particles/m during ebb tide. The concentration of MPs in the outer zone of the estuary (ocean) was detected to be higher than in the inner zone of the estuary (river). The MPs found were dominated by black color, film shape and size 101-250 μm. A greater abundance of MPs at ebb tide than at flood tide implies that the Musi Estuary's largest source of emissions is discharge from the river.