Nanomaterials (Apr 2024)

Pyroclastic Dust from Arequipa-Peru Decorated with Iron Oxide Nanoparticles and Their Ecotoxicological Properties in Water Flea <i>D. magna</i>

  • Juan A. Ramos-Guivar,
  • Yacu V. Alca-Ramos,
  • Erich V. Manrique-Castillo,
  • F. Mendoza-Villa,
  • Noemi-Raquel Checca-Huaman,
  • Renzo Rueda-Vellasmin,
  • Edson C. Passamani

DOI
https://doi.org/10.3390/nano14090785
Journal volume & issue
Vol. 14, no. 9
p. 785

Abstract

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A novel magnetic composite made of Peruvian pyroclastic dust material decorated with maghemite nanoparticles was synthesized and characterized using a variety of analytic techniques. The 13 nm maghemite nanoparticles were grown on the pyroclastic dust using the conventional coprecipitation chemical route. A short-term acute assay was developed to study the ecotoxicological behavior of the water flea, Daphnia magna. A 24 h-lethal concentration (LC50) value equal to 123.6 mg L−1 was determined only for the magnetic composite. While the pyroclastic dust material did not exhibit a lethal concentration, it caused morphologically significant changes (p LC50 revealed less tolerance and significant changes in the body, heart, antenna, and eye. Hence, it affects biomarker growth and swimming. The reproduction rate was not affected by the raw pyroclastic dust material. However, the number of individuals showed a decrease with increasing composite concentrations. The present study indicates the LC50 value, which can be used as a reference concentration for in-situ water cleaning with this material without damaging or changing the Daphnia magna ecosystem.

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