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Food chain bioaccumulation: Pesticides and microplastics
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The Role of Microplastics in Bioaccumulation of Pollutants
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Microplastics act as vectors for environmental pollutants including heavy metals and persistent organic compounds, concentrating these toxins on their surfaces and transferring them through food webs via bioaccumulation. This vector effect amplifies the health risks of microplastic ingestion beyond the particles themselves, compounding toxic exposure in humans and wildlife.
The Role of Microplastics in Bioaccumulation of Pollutants
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Microplastics act as environmental sponges, sorbing organic compounds, heavy metals, and other emerging contaminants from surrounding ecosystems and concentrating them as they move up the food chain through bioaccumulation. This vector effect means that ingesting microplastics carries a compounded toxicological risk beyond the plastic particles themselves, amplifying exposure to multiple co-contaminants simultaneously.
Microplastics as Vectors of Pesticides
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Researchers reviewed how microplastics act as secondary vectors for pesticides in agricultural soils, altering the sorption, desorption, transport, persistence, and bioavailability of agrochemicals in ways that complicate conventional risk assessments.
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This chapter documented the multiple routes by which microplastics enter the food chain — including ingestion by marine invertebrates, fish, and livestock, as well as contamination of crops via irrigation and soil amendments — and traced their biomagnification potential up the food web to human consumers. Because humans sit at the top of multiple food chains simultaneously, this multi-pathway exposure makes dietary microplastic intake a significant and difficult-to-avoid health concern.
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Researchers reviewed the sources, occurrence, and health implications of microplastic contamination across diverse food categories, tracing pathways from agricultural soils and processing facilities to the human dinner plate. The pervasiveness of microplastics in the food supply means dietary ingestion is a primary and daily human exposure route, underscoring the urgency of setting regulatory limits and improving food safety standards.
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