Chemistry of Combustion-generated Nanoparticles and their Transformation in Particle Filters

Area of Science:

• Environmental Science
• Toxicology
• Nanotechnology

Background:

• Combustion-generated nanoparticles (10-200 nm) can transport adsorbed compounds into the human body via the Trojan Horse effect.
• Nanoparticle toxicology depends on the chemical nature of adsorbed substances.
• Engine exhausts contain potential carcinogens and mutagens like polycyclic aromatic hydrocarbons (PAHs) and dioxins.

Purpose of the Study:

• To determine the genotoxic potential of combustion nanoparticles.
• To quantify levels of carcinogens and mutagens (PAHs, nitro-PAHs, PCDDs, PCDFs) in diesel, gasoline, and jet engine exhausts.
• To investigate the impact of catalytic particle filters on these toxic compounds.

Main Methods:

• Analysis of nanoparticle adsorbates for genotoxic potential.
• Quantification of PAHs, nitro-PAHs, PCDDs, and PCDFs in various engine exhausts.
• Assessment of catalytic particle filter efficacy in reducing these harmful compounds.

Main Results:

• Genotoxic potential of combustion nanoparticles was determined.
• Significant levels of carcinogens and mutagens were found in diesel, gasoline, and jet engine exhausts.
• Catalytic particle filters showed an impact on the levels of these adsorbed compounds.

Conclusions:

• Combustion nanoparticles pose a genotoxic risk due to adsorbed carcinogens and mutagens.
• Engine exhaust composition influences nanoparticle toxicity.
• Catalytic particle filters may mitigate the risks associated with these nanoparticles.