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Expanded Polystyrene Exposure and Nitrite-Related Absorbance in Eisenia fetida
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Researchers studied earthworms (Eisenia fetida) during composting, comparing those exposed to expanded polystyrene microplastics with unexposed worms. Waste material from exposed worms showed higher readings linked to nitrite in a chemical test, but without a calibration step, exact nitrite levels could not be determined and the cause of the difference remains unclear.
Microplastic contamination can affect soil properties, microbial communities, and nutrient cycling. This study evaluated whether expanded polystyrene (EPS) microplastic exposure during vermicomposting affected nitrite-related absorbance in vermicast produced by Eisenia fetida. Fifty independent experimental units were divided into a control treatment without EPS (n = 25) and an EPS treatment (n = 25). After a 12-day exposure period, vermicast samples were extracted with calcium chloride and analyzed using a modified Griess-type colorimetric reaction. Griess-reactive absorbance was measured at 540.1 nm with a visible-light spectrophotometer. Mean absorbance was 1.25 absorbance units (AU) in the EPS treatment and 0.766 AU in the control, a 63% difference between group means. A Mann-Whitney U test indicated a significant difference between treatments (U = 75, z = -4.6, p < 0.01). Under these experimental conditions, EPS exposure was associated with greater Griess-reactive absorbance in vermicast. Because no nitrite calibration curve was generated, the results cannot be interpreted as absolute nitrite concentrations, and the mechanism underlying the observed difference remains unresolved.
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This study assessed the effects of agricultural plastic waste, including LDPE, LLDPE, and expanded polystyrene, on vermicomposting with the earthworm Eisenia fetida. Plastic debris in the compost at 1.25% fresh weight did not significantly affect earthworm survival but altered compost maturation, microbial activity, and resulting compost quality.
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Researchers studied how polystyrene microplastics affect the uptake of cadmium and arsenic by earthworms in paddy soil. They found that microplastics altered the soil chemistry in ways that changed how much of these metals the earthworms absorbed, with effects varying by metal type and concentration. The study suggests that microplastics in contaminated agricultural soils can influence how toxic metals move through the food chain.
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Researchers found microplastics in animal manure compost from both cow and sheep farms, confirming that using manure as fertilizer introduces plastic particles into agricultural soil. When earthworms were exposed to these contaminated composts, they showed signs of oxidative stress and cellular damage. Since manure composting is a widespread farming practice, this represents a significant pathway for microplastics to enter the soil where food crops are grown.
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