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Related Concept Videos

Masking and Demasking Agents01:19

Masking and Demasking Agents

EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...
Administering Oxygen by Mask01:30

Administering Oxygen by Mask

Administering Oxygen by Mask
Administering oxygen by mask is a common nursing intervention that provides supplemental oxygen to patients with respiratory distress or chronic lung conditions. This procedure involves delivering oxygen at a specified rate through a face mask connected to an oxygen source.
Equipment
The equipment necessary for this procedure includes:

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Related Experiment Video

Updated: Jun 12, 2026

Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis
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Do We Need Titanium Dioxide (TiO2) Nanoparticles in Face Masks?

Stijn Everaert1, Lode Godderis2,3, Jean-Marie Raquez4

  • 1Chemical Environmental Factors Group, Superior Health Council, 1210 Brussels, Belgium.

Toxics
|April 25, 2025
PubMed
Summary
This summary is machine-generated.

Titanium dioxide nanoparticles (TiO2 NPs) in face masks may pose health risks like inflammation and genotoxicity. Prolonged use of some masks with TiO2 NPs is not recommended due to potential nanosafety concerns.

Keywords:
TiO2face maskshuman healthinhalation exposurenanoparticles

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Public Health

Background:

  • Face masks are crucial for pandemic prevention.
  • Antimicrobial face masks often contain metal nanoparticles.
  • Titanium dioxide nanoparticles (TiO2 NPs) are a key concern due to potential carcinogenicity.

Purpose of the Study:

  • To review the risks of TiO2 NPs in face masks.
  • To assess the nanosafety of TiO2 NP-containing face masks for human health.
  • To evaluate the precautionary principle regarding TiO2 NP use in face masks.

Main Methods:

  • Literature review on face mask composition, filtration, and antimicrobial agents.
  • Analysis of TiO2 NP antimicrobial mechanisms and health hazards.
  • Risk assessment using worst-case exposure scenarios from leaching data.

Main Results:

  • Inhalation of TiO2 NPs can cause oxidative stress, inflammation, and genotoxicity.
  • Most face masks are safe for limited use; some may be unsafe for prolonged, intensive use.
  • Uncertainties exist regarding combined exposures and direct measurement of TiO2 NP exposure.

Conclusions:

  • The use of TiO2 NPs in face masks presents potential health risks.
  • Prolonged and intensive use of certain TiO2 NP face masks may be inadequate for nanosafety.
  • A ban on TiO2 in face masks is recommended based on the precautionary principle due to safety concerns and limited added benefit.