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Accumulation of Pd-doped Polystyrene Nanoplastics in the Digestive Tract of Sebastes Schlegelii
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Researchers tracked the accumulation of palladium-doped polystyrene nanoplastics in the digestive tract of black rockfish (Sebastes schlegelii) using ICP-MS, finding that nanoplastics accumulated in gut tissue and feces in a concentration-dependent manner after only three days of exposure.
Nanoplastics (NPs) are widely concerned because of their potential adverse effects on marine organisms. However, the detection and quantification of NPs are challenging due to their small size and weak signals. In this study, the ac-cumulation of Pd-doped polystyrene (PS) NPs in the digestive tract of Sebastes schlegelii was investigated by an inductively coupled plasma mass spectrometer (ICP-MS). Results showed that NPs could be accumulated in the digestive tract and faeces after 3-day exposure with concentrations of 0.5, 5, and 10 mg/L. The highest accumulation of NPs was in the digestive tract, up to 0.23 ± 0.02 mg/g wet wt after 2 days. However, the highest accumulation of NPs was found in faeces (29.59 ± 0.54 mg/g wet wt) after 3-day exposure. Moreover, the digestive tract and faeces showed a concentration-dependent of NPs, which may lead to the transfer of NPs to higher trophic levels. The present study provides evidence for the bioaccumulation of NPs in organisms and the potential impact of NPs on ecological risk.
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Researchers exposed juvenile black rockfish (Sebastes schlegelii) to polystyrene microplastics for 24 days, finding that concentrations of 0.1 mg/L and above caused significant antioxidant enzyme disruption, immune suppression with rising inflammatory cytokines, and reduced survival at 1 mg/L.
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