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Longitudinal distribution of floating microplastics in rural rivers and potential (temporal) sinks
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A study of microplastic distribution along rural rivers found that concentrations varied greatly along river length, with temporary accumulation zones — such as gravel bars and vegetation — acting as storage sites before plastics are remobilized during flood events. This longitudinal variability means that sampling at a single location may not accurately represent total river plastic loads. Understanding where plastics accumulate in river systems is essential for estimating how much eventually reaches the ocean.
It is assumed that 80% of the marine plastic originates from land and major parts may be transported via rivers. In each river studied so far for plastic contamination, plastic was found. However, the longitudinal distribution of plastic in rivers is largely unknown. We investigated the microplastic distribution along a 70 km long stretch of a German river, starting at the source. We sampled floating microplastic every seventh kilometer and upstream and downstream of major inflows, towns and waste water treatment plants. Results showed that the amount of suspended plastic does not correlate with the kilometers flew. Some sampling points downstream other contain less plastic than sites located more upstream. Weirs and reservoirs may act as sinks for microplastics as decreasing flow velocities lead to higher sedimentation rates. This may enhance the uptake of plastic by benthic organisms and (temporally) excludes plastic from the water column. This may result in unexpected patterns of plastic distribution in freshwaters. Also see: https://micro2022.sciencesconf.org/426748/document
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This study measured microplastic concentration depth profiles in river flow and found that particles are not uniformly distributed in the water column, with implications for sampling strategy and the accuracy of estimates of total microplastic transport.
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This study demonstrated that microplastic loads in streams show significant spatial and temporal variability driven by storm events and seasonal patterns, and that these dynamics can strongly influence the total plastic export from river systems to downstream waters.
Dynamics of microplastics in urban rivers under varying hydrological regimes
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Monitoring of urban rivers showed that microplastic concentrations fluctuate significantly with varying hydrological conditions such as storm events and seasonal flow changes. Understanding these dynamics is essential for accurately characterizing the river microplastic load and its variability over time.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.