Changes in CO2 Concentration in the Breath of Laboratory Animals during Inhalation of Metal-Oxide Nanoparticles

Fine and nanosize particles of both natural and anthropogenic origin can be present in the atmospheric air and affect the environment and human health. The effect of cobalt ferrite (CoFe 2 O 4 ), magnetite (Fe 3 O 4 ), and tin dioxide (SnO 2 ) nanopowder inhalation of laboratory animals on the carbon dioxide content in air samples taken from the noses of these animals is studied. The CO 2 concentration is determined from the absorption spectra of air samples recorded with a laser photoacoustic (PA) gas analyzer. It is ascertained that inhalation of magnetite nanoparticles leads to a decrease in the concentration of carbon dioxide in the samples of exhaled air of laboratory animals, which can indicate a negative effect of this exposure.