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Little evidence that dams in the Orange–Vaal River system trap floating microplastics or microfibres
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Fish in a major South African river are full of microplastics
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The Vaal River in South Africa, which supplies drinking water and supports livelihoods for over 11 million people, was found to be heavily contaminated with microplastics throughout its fish populations. This finding underscores the threat microplastic pollution poses to freshwater food sources and drinking water security in densely populated river basins.
Limited long-distance transport of plastic pollution by the Orange-Vaal River system, South Africa
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Researchers sampled water from 33 bridges along South Africa's Orange-Vaal River system at wet and dry seasons and found microfibres at every site (>99% of items), but found that larger plastic fragments were largely confined to urban upstream reaches, suggesting the river transports fibres widely but limits long-distance transport of larger debris.
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This review pulled together 41 studies to show that Africa's rivers and lakes are widely contaminated with microplastics, tiny plastic fragments and fibers, with even higher levels showing up in sediment (the mud and sand at the bottom) than in the water itself, especially during rainy seasons. Since these freshwater sources are often used for drinking water and fishing, this contamination matters because we still don't fully know how ingesting these particles over time affects human health, making this an area that urgently needs more research and better plastic waste management.
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