We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Sediment and microplastic particles settling process in freshwater: experimental settling tubes
AI summary Read the abstract
Laboratory experiments studied how microplastic particles of varying density and size settle through freshwater when mixed with natural sediment, finding that particle interactions significantly affected settling behavior. Neutral and negatively buoyant microplastics settled along with sediment, while buoyant particles behaved differently. The findings improve understanding of how microplastics are distributed through the water column and accumulate in riverbed and lake sediments.
Microplastic pollution is an environmental problem facing rivers, oceans, and coastlines. Estimations suggest that around 1.15 to 12.7 million tonnes of plastic waste enter to oceans every year from the global riverine system. Plastic pollution measurements in rivers and coast have shown that a significant volume of microplastics are formed buoyant, non-buoyant and neutral microplastics. These plastic particles have been found deposited and stored in the sediments, causing lethal effects to animals. Vertical distribution of microplastic particles in sedimentary deposits shows that the amount of plastic deposit decreases in deeper layers, with any specific pattern related to the plastic density. This means that all the types of plastics are found on similar percentages all over the layers without any physics explanation. For this reason, this research aims to understand what are the physical parameters that control the stratigraphy of the vertical distribution of microplastic pollution in sedimentary deposits. Therefore, a set of 52 experimental settling tubes were designed using different volumes of microplastic particles and sediment. The experimental results highlight the relative importance of microplastic-sediment concentrations controlling the distribution of plastic material within the deposits, which have a range of implications for concentrations in the fields as well as the spatial distribution of microplastic deposits in natural environments. Also see: https://micro2022.sciencesconf.org/426197/document
More Papers Like This
Evaluating settling velocities of microplastics-sediment mixtures under laboratory conditions
AI summary Read the abstract
This laboratory study investigated how microplastics behave when mixed with natural sediment particles and allowed to settle in water, finding that the combined aggregates settle at different rates than either material alone. Smaller microplastics were particularly prone to forming flocs with sediment, which can accelerate their sinking and burial in riverbeds and lake bottoms. Understanding these settling dynamics is important for predicting where microplastics accumulate in aquatic environments and how they interact with the food chain.
Rapid flocculation and settling of positively buoyant microplastic and fine-grained sediment in natural seawater
AI summary Read the abstract
Laboratory experiments showed that positively buoyant microplastics rapidly flocculated with fine-grained sediment in natural seawater, causing particles that would otherwise float to sink quickly. The finding has important implications for predicting microplastic fate in estuaries, where plastic-sediment aggregates may settle to the seafloor rather than dispersing.
Experimenting on Settling Velocities of Negatively Buoyant Microplastics
AI summary Read the abstract
Researchers experimentally measured the settling velocities of negatively buoyant microplastics in water, filling a critical gap in understanding how dense plastic particles sink and distribute through the water column — essential for modeling where microplastics accumulate in marine and freshwater environments.
Sedimentation behavior of aggregated microplastics: Influence of particle size and water constituents in environmental waters
AI summary Read the abstract
Laboratory experiments investigated how aggregation of microplastics with sediments and organic matter affects their sinking rates in water, finding that aggregate composition strongly influences settling velocity. These findings improve models predicting whether microplastics sink to the seafloor or remain suspended in the water column.
Experimenting on Settling Velocities of Negatively Buoyant Microplastics
AI summary Read the abstract
Researchers conducted laboratory experiments to measure the settling velocities of negatively buoyant microplastics in water, providing fundamental physical data on how denser-than-water plastic particles sink through the water column. This data is critical for modeling where microplastics accumulate in coastal and ocean environments.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.