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<p>Substantial amounts of microplastics are ingested by living organisms, in particular by&#xa0;humans; yet, the fate of&#xa0;microplastics through digestion is poorly known. Here, we administrated 1–2&#xa0;mm polystyrene microplastics to quails to monitor their dynamics of fecal excretion. We quantified small-sized polystyrene microplastics, lower than 500&#xa0;µm, by pyrolysis-assisted thermal desorption gas chromatography-mass spectrometry. The surface morphology of parent microplastics was also characterized. Results show that 90&#xa0;wt% of parent particles were excreted within 10&#xa0;days, mostly in the first 24&#xa0;h, whereas fragmented microplastics persisted for up to 20-day post-ingestion. Aged polystyrene and sand co-administered particles exhibited greater fragmentation than those in other groups. Parent microplastics were significantly oxidized after digestion.</p>

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Rapid excretion of raw microplastics and longer persistence of fragmented microplastics in the quail digestive system

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Ziye Zhang,
  • Ying Yang,
  • Wenzhuo Shi,
  • Wei Pan,
  • Xiaoli Zhao,
  • Song Cui,
  • Lihui An

摘要

Substantial amounts of microplastics are ingested by living organisms, in particular by humans; yet, the fate of microplastics through digestion is poorly known. Here, we administrated 1–2 mm polystyrene microplastics to quails to monitor their dynamics of fecal excretion. We quantified small-sized polystyrene microplastics, lower than 500 µm, by pyrolysis-assisted thermal desorption gas chromatography-mass spectrometry. The surface morphology of parent microplastics was also characterized. Results show that 90 wt% of parent particles were excreted within 10 days, mostly in the first 24 h, whereas fragmented microplastics persisted for up to 20-day post-ingestion. Aged polystyrene and sand co-administered particles exhibited greater fragmentation than those in other groups. Parent microplastics were significantly oxidized after digestion.