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Determination of microplastic content in freshwater lakes in western Tennessee
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This American master's thesis determined microplastic content in freshwater lakes in western Tennessee using sampling and analytical methods. The study quantified and characterized microplastic particles from these inland water bodies.
Fused pyridines are widely applicable in various fields of medicinal chemistry. Last years different biological activities as antidepressants, antiallergics, antidiabetics, antihistaminics and so on are shown for them. Most of hits contained heterocycles annelated to the pyridineu2019s core. The problematic of the functionalization of such type of compounds very often solved on the heterocyclization stage. The methodology for producing of heteroannelated 3-cyanopyridines based on the cyclization reaction of diverse aminoheterocycles with sodium 2-cyano-2-(dimethoxymethyl)eth-1-en-1-olate 1 were elaborated and adapted for multigram scale.In this report, the synthesis of starting reagent sodium 2-cyano-2-(dimethoxymethyl)eth-1-en-1-olate in kilo scale is elaborated. The synthetic methodology for the cyclization is validated and optimized. The advantages and scope and limitation of the procedure are determined and will be discussed.
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*WINNER* Determination of microplastic content in western Tennessee lakes
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Microplastics were detected in two Tennessee lakes with differing levels of human activity, with higher concentrations in the more heavily used lake. The study highlights that even inland freshwater bodies are contaminated with microplastics and that human activity intensifies contamination levels.
Microplastics in freshwater ecosystems and effects on biota
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This Croatian thesis reviews the occurrence of microplastics in freshwater ecosystems worldwide and examines their effects on aquatic organisms. The author summarizes research on microplastic concentrations in rivers and lakes and discusses ecological impacts on freshwater biota.
Spatiotemporal variability of microplastics in Muskoka-Haliburton headwater lakes, Ontario, Canada
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A survey of 14 headwater lakes in rural Ontario found average microplastic concentrations of 1.78 particles per liter, with atmospheric deposition identified as the dominant input source rather than local human activity or watershed size. Seasonal variability was pronounced, with summer concentrations roughly half those of spring, while sediment burial accounted for only 14% of annual removal, suggesting these pollutants persist in the water column.
Spatial Distribution and Characterization of Microplastics in the State Parks’ Water Bodies within A Large-scale Watershed in the U.S.A.
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A study of seven Virginia State Parks within the James River Watershed found microplastic concentrations ranging from 0 to 26.5 particles per liter, with higher concentrations in mainstream water bodies and a significant positive correlation with overnight tourist activity. The findings show that even protected natural areas are not shielded from microplastic pollution, and human visitation is a meaningful driver of contamination in freshwater ecosystems.
Towards a greater understanding of the presence, fate and ecological effects of microplastics in the freshwater environment
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This thesis combined field surveys and laboratory experiments to investigate microplastic presence, abundance, and ecological effects in freshwater environments, contributing important data to fill knowledge gaps about how plastic pollution behaves in rivers and lakes.
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