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<p>Nanoecotoxicology is essential for understanding the environmental impact of nanomaterials. This study evaluated the impact of Bi<sub>2</sub>S<sub>3</sub>-PVP nanorods on two model aquatic organisms with contrasting biology: <i>Daphnia magna</i> and <i>Pomacea</i> sp. The physicochemical properties of the nanorods were characterized. Nanorods presented a uniform hydrodynamic size (217.9 + / − 25.8&#xa0;nm), Z-potential of − 5.24 + / − 0.76&#xa0;mV, and thermal stability up to 500&#xa0;°C. <i>Daphnia</i> incorporated Bi<sub>2</sub>S<sub>3</sub>-PVP nanorods in the digestive tract, but no evidence of immobilization/mortality (in presence or absence of xanthan gum as stabilizer) was observed up to 100&#xa0;mg L<sup>−1</sup>. Snail’s growth rate and ingestion rate were not affected by Bi<sub>2</sub>S<sub>3</sub>-PVP at concentrations of T1 = 1 and T10 = 10&#xa0;mg L<sup>−1</sup> in the evaluated timeframe. Oxygen consumption increased significantly in both treatments T1 and T10, with respect to the control after 18 and 28&#xa0;days of exposure. Bismuth concentrations were detected and quantified in snail muscle in both treatments (T1 = 13.66 ± 20&#xa0;mg&#xa0;kg<sup>−1</sup> and T10 = 94.74 ± 144&#xa0;mg&#xa0;kg<sup>−1</sup>), and the bioaccumulation factor (BAF) was positive (BAF = 13.96 ± 20.99) and equal for both treatments. Bi<sub>2</sub>S<sub>3</sub>-PVP nanorods interact with both aquatic organisms and were ingested by both organisms, highlighting their bioavailability across different trophic levels. We report for the first time the bioaccumulation of these NPs in the tissues of a freshwater snail and in the gut content of <i>Daphnia</i>. These results contribute to the knowledge of nanomaterials’ ecological risks, requiring the understanding of their dynamics and the development of regulatory frameworks for assessing emerging technologies.</p>

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Ecotoxicological impact of the semiconductor nanomaterial Bi2S3 on the water flea (Daphnia magna) and the apple snail (Pomacea sp.)

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • Florencia Feola,
  • Angel Segura,
  • Isabel Galain,
  • Ivana Aguiar,
  • Ignacio Machado,
  • Mariela Pistón,
  • María Eugenia Pérez Barthaburu

摘要

Nanoecotoxicology is essential for understanding the environmental impact of nanomaterials. This study evaluated the impact of Bi2S3-PVP nanorods on two model aquatic organisms with contrasting biology: Daphnia magna and Pomacea sp. The physicochemical properties of the nanorods were characterized. Nanorods presented a uniform hydrodynamic size (217.9 + / − 25.8 nm), Z-potential of − 5.24 + / − 0.76 mV, and thermal stability up to 500 °C. Daphnia incorporated Bi2S3-PVP nanorods in the digestive tract, but no evidence of immobilization/mortality (in presence or absence of xanthan gum as stabilizer) was observed up to 100 mg L−1. Snail’s growth rate and ingestion rate were not affected by Bi2S3-PVP at concentrations of T1 = 1 and T10 = 10 mg L−1 in the evaluated timeframe. Oxygen consumption increased significantly in both treatments T1 and T10, with respect to the control after 18 and 28 days of exposure. Bismuth concentrations were detected and quantified in snail muscle in both treatments (T1 = 13.66 ± 20 mg kg−1 and T10 = 94.74 ± 144 mg kg−1), and the bioaccumulation factor (BAF) was positive (BAF = 13.96 ± 20.99) and equal for both treatments. Bi2S3-PVP nanorods interact with both aquatic organisms and were ingested by both organisms, highlighting their bioavailability across different trophic levels. We report for the first time the bioaccumulation of these NPs in the tissues of a freshwater snail and in the gut content of Daphnia. These results contribute to the knowledge of nanomaterials’ ecological risks, requiring the understanding of their dynamics and the development of regulatory frameworks for assessing emerging technologies.