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Refined analysis of microplastics in endemic fish species from Lake Victoria using µ-FTIR and pyrolysis GC-MS
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Scientists found tiny plastic bits, like nylon and polypropylene (common in clothing, packaging, and fishing gear), inside fish from Lake Victoria, an important food source for millions of people in East Africa. Using advanced detection methods, they confirmed these plastics were present at measurable levels in the fish's digestive tracts, though not every fish species tested showed contamination. This matters because eating fish that haven't had their guts removed could mean consuming these plastic particles, and better detection methods like the one used here help scientists more accurately track how much plastic pollution is making its way into our food.
Pyrolysis-gas chromatography-mass spectrometry (Pyr-GC-MS) has evolved into one of the most powerful methods for microplastics (MPs) analysis. However, analytical challenges are still encountered whenever Pyr-GC-MS is applied to matrices with high organic matter, protein and lipid contents. In this study, a workflow integrating stereomicroscopy, micro-Fourier transform infrared (µ-FTIR) spectroscopy and Pyr-GC-MS was extended to analyse MPs in three endemic fish species (Protopterus aethiopicus, Rastrineobola argentea and Synodontis victoriae) from Lake Victoria. Stereomicroscopic analysis only detected MPs in the gastrointestinal tracts of P. aethiopicus and S. victoriae, with the highest mean particle numbers being 16.0 ± 7.8 and 14.7 ± 6.7 items/fish taxon, respectively. No MPs were found in whole samples of R. argentea. The microparticles were mostly blue and brown 0.3-1.9-mm fragments and filaments, which µ-FTIR analysis confirmed to be composed of nylon 66, nylon 6/66, nylon 6/10, nylon 11, polyethylene and polypropylene. Retention time locking and post-column backflush considerably reduced the cycle time and increased stability of the Pyr-GC-MS method. Nylon 66 (243 µg/g in S. victoriae), nylon 6 (0.24-96 µg/g), polypropylene (6.4 µg/g in P. aethiopicus), poly(ethylene terephthalate) (1.2-107 µg/g) and styrene-butadiene rubber (8.5-34.8 µg/g) were quantified. Polyethylene and poly(methyl methacrylate) were detected below their limits of quantification. To prevent false positive detection of polyethylene in the lipid-rich tissues, the evaluation focussed on C21-α,ω-alkene as a marker. Polypropylene was not detected in some samples, as it formed several discrete propylene oligomers during pyrolysis, which suppressed the yield of its target quantification marker (2,4-dimethyl-1-heptene).
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Levels and Classification of Microplastics and Their Impact on the Wellbeing of Selected Commercially Important Fish Species in Kisumu Bay, Lake Victoria
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A study in Kenya's Lake Victoria found microplastics in the digestive tracts of 65% of fish sampled across four commercially important species, including Nile perch and tilapia. Given that these species are important sources of dietary protein for millions of people in East Africa, the findings raise direct human health concerns about plastic ingestion through fish consumption and call for stronger environmental protections in African freshwater systems.
Occurrence of microplastics in surface water, superficial sediments and Nile tilapia (Oreochromis niloticus) from fish breeding areas of Lake Victoria
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Microplastics were detected in 100% of water samples, 83% of sediment samples, and 56% of Nile tilapia from four breeding sites in Lake Victoria, with urban sites showing higher contamination. Filaments were the dominant microplastic form, and microplastics found in fish gills raise concerns about direct human exposure through consumption.
Microplastics (MPs) and Nanoplastics (NPs) in Lake Victoria: A Systematic Review of Contamination Pathways, Trophic Transfer, and Health Implications in the Context of Emerging Contaminants.
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Scientists reviewed existing studies on tiny plastic particles polluting Lake Victoria, a major freshwater source in East Africa, tracing how they move from water into fish and other wildlife. While this review doesn't test new samples, it highlights growing concern that these plastics could work their way up the food chain to people who eat fish or drink the water, though more research is needed to confirm actual health risks.
Microplastics (MPs) and Nanoplastics (NPs) in Lake Victoria: A Systematic Review of Contamination Pathways, Trophic Transfer, and Health Implications in the Context of Emerging Contaminants.
AI summary Read the abstract
This review pulls together existing research on tiny plastic particles found in Lake Victoria, a major freshwater source in East Africa, tracing how they move from water into fish and other wildlife. It matters because these particles could eventually make their way into people's food and water, though the review focuses on organizing what's already known rather than proving new health effects.
Evaluating the interaction of plant communities with microplastics found in water and soil sediments of Lake Victoria
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Researchers surveyed Lake Victoria to assess how microplastic contamination in water and soil sediments interacts with aquatic plant communities. Using ATR-FTIR spectroscopy, they identified various polymer types in the samples and documented plant species growing at the contaminated sites. The study highlights the ecological implications of microplastic accumulation in East African freshwater systems and the need for further research on how these pollutants affect aquatic vegetation.
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