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Updated: Mar 14, 2026

Assessing Disaster Resilience of Concrete with Titanium Dioxide Nanoparticles
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Titanium dioxide nanoparticles strongly impact soil microbial function by affecting archaeal nitrifiers.

Marie Simonin1,2, Agnès Richaume1, Julien P Guyonnet1

  • 1Univ Lyon, Université Claude Bernard Lyon 1, UMR CNRS 5557, Laboratoire d'Ecologie Microbienne, UMR INRA 1418, bât G. Mendel, 43 boulevard du 11 novembre 1918, F-69622 Villeurbanne Cedex, France.

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Titanium dioxide nanoparticles (TiO2-NPs) harm agricultural soil microbes and nitrogen cycling. Even low concentrations disrupt soil health and function, necessitating further research on these emerging pollutants.

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Area of Science:

  • Environmental Science
  • Soil Science
  • Microbiology

Background:

  • Soils face emerging environmental stressors like titanium dioxide nanoparticles (TiO2-NPs).
  • The impact of TiO2-NPs on soil function and microbial communities is largely unknown.
  • Agricultural soils are increasingly exposed to these emerging pollutants.

Purpose of the Study:

  • To investigate the effects of TiO2-NPs on agricultural soil microbial communities.
  • To assess the impact of TiO2-NPs on nitrogen cycle processes (nitrification and denitrification).
  • To examine shifts in bacterial, archaeal, and ammonia-oxidizing microbial diversity.

Main Methods:

  • Exposure of agricultural soil to TiO2-NPs (1 and 500 mg kg-1 dry soil) for 90 days.
  • Measurement of nitrification and denitrification enzyme activities.
  • Quantification of key functional genes (amoA, nirK, nirS) and microbial community diversity analysis.

Main Results:

  • TiO2-NPs significantly inhibited nitrification enzyme activities.
  • Abundances of ammonia-oxidizing microorganisms decreased.
  • Cascading negative effects observed on denitrification enzyme activity and bacterial community structure, even at low NP concentrations.

Conclusions:

  • TiO2-NPs pose a significant threat to soil microbial communities and nitrogen cycling in agricultural soils.
  • Exposure to realistic concentrations of TiO2-NPs can lead to profound soil function modification within 90 days.
  • Further research is crucial to understand the long-term implications of TiO2-NPs on soil health and ecosystem function.