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The Marine Biomonitor Mytilus galloprovincialis: A Study on Microplastics as a Vector for Heavy Metals Pollution in Sardinia (Italy)
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Scientists studying mussels from Italy found tiny plastic fibers in every sample, but most were natural materials like cellulose and cotton, not synthetic plastic. Good news: the heavy metals attached to these plastic bits were much lower than metal levels already in the mussel meat itself, meaning plastic isn't a major way toxic metals reach your dinner plate.
The main objective of the present study was to assess the contamination level and nature of microplastics and their role as vectors of trace elements in Mediterranean mussels (Mytilus galloprovincialis). A total of 39 samples were collected from four farming areas (1–4) located in Sardinia (Italy) and selected according to the principles of the risk assessment. The concentrations of 22 trace elements (Be, Tl, Sb, Ag, Hg, Th, U, Sn, Co, Cd, Li, Mo, Cr, Ba, V, Ni, Pb, Se, Mn, Cu, As, Zn) in mussels and plastic particles extracted from mussels was determined by inductively coupled plasma mass spectrometry (ICP-MS/MS). The isolated plastic particles were characterized by Fourier Transform Infrared Spectroscopy (µ-FTIR). All samples were compliant with the European Union official limits set for Hg, Cd and Pb (Reg. UE 915/2023). Plastic particles were identified in all the samples with a total of 1007 isolated microfibers. Qualitative characterization of microplastics showed that natural polymers predominated, accounting for over 85% of the isolated microfibers. Cellulose was the most abundant polymer (55.29%), followed by cotton (30.59%). Synthetic polymers were present only as a minor fraction (~15%). These results support the use of Mytilus galloprovincialis as a reliable bioindicator of microplastics pollution. Heavy metal concentrations associated with microplastics ingested by Mytilus galloprovincialis were markedly lower than those measured directly in the edible tissues of the mussels, highlighting that microplastics likely contribute minimally as vectors of metals to human consumers. The results of the present study allowed for a comprehensive evaluation of both microplastics contamination and the distribution of heavy metals in mussels reared in Sardinia, providing a robust framework for subsequent risk assessment studies.
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A nationwide study across Italy found microplastics in 7-13% of common mussels sampled from Italian seas, mainly polypropylene and polystyrene fragments and fibers. Since mussels are eaten whole without removing their digestive system, any microplastics inside them are directly consumed by people. The findings underscore the need for standardized detection methods and better waste management to protect both marine ecosystems and the seafood supply.
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Scientists analyzed commercially sold mussels from markets in southern Italy and found microplastics in every sample tested. On average, each mussel contained about 1.6 plastic particles, with fibers being the most common type, followed by fragments. Since mussels are eaten whole by consumers, the findings highlight a direct pathway for human exposure to microplastics through seafood.
Bioaccumulation of emerging contaminants in mussel (Mytilus galloprovincialis): Influence of microplastics
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Researchers investigated whether microplastics influence the bioaccumulation of emerging contaminants in Mediterranean mussels. The study found that the presence of microplastics altered how certain chemical pollutants accumulated in mussel tissue, suggesting that microplastics can act as carriers that change the uptake and distribution of other contaminants in marine organisms.
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Scientists tested how mussels—a popular seafood—absorb and get rid of tiny polyester fibers (like those shed from synthetic clothing) at different exposure levels, and found that higher exposure didn't necessarily mean more fibers stayed trapped in the mussels' bodies. Even more notably, the "clean" mussels used as a comparison group already had microplastic fibers in them before the experiment even started, showing just how widespread this contamination already is. This matters because it suggests eating mussels and other shellfish is a likely route for microplastics to enter our diets, even from seafood we assume is uncontaminated.
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Researchers conducted surveys of microplastic contamination in mussels from coastal sites across Morocco and Tunisia, finding plastics in 79 to 100 percent of all samples. The most common types were polyethylene and polypropylene fibers and fragments, with chemical analysis revealing the presence of associated toxic additives. The study estimates that regular mussel consumers in these regions face meaningful microplastic intake, highlighting a potential human health concern.
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