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  • Exposure, health and ecological effects review of engineered nanoscale cerium and cerium oxide associated with its use as a fuel additive.

Exposure, health and ecological effects review of engineered nanoscale cerium and cerium oxide associated with its use as a fuel additive.

Critical reviews in toxicology (2011-01-20)
Flemming R Cassee, Erna C van Balen, Charanjeet Singh, David Green, Hans Muijser, Jason Weinstein, Kevin Dreher
RESUMEN

Advances of nanoscale science have produced nanomaterials with unique physical and chemical properties at commercial levels which are now incorporated into over 1000 products. Nanoscale cerium (di) oxide (CeO(2)) has recently gained a wide range of applications which includes coatings, electronics, biomedical, energy and fuel additives. Many applications of engineered CeO(2) nanoparticles are dispersive in nature increasing the risk of exposure and interactions with a variety of environmental media with unknown health, safety and environmental implications. As evident from a risk assessment perspective, the health effects of CeO(2) nanoparticles are not only dependent on their intrinsic toxicity but also on the level of exposure to these novel materials. Although this may seem logical, numerous studies have assessed the health effects of nanoparticles without this simple but critical risk assessment perspective. This review extends previous exposure and toxicological assessments for CeO(2) particles by summarizing the current state of micro and nano-scale cerium exposure and health risks derived from epidemiology, air quality monitoring, fuel combustion and toxicological studies to serve as a contemporary comprehensive and integrated toxicological assessment. Based on the new information presented in this review there is an ongoing exposure to a large population to new diesel emissions generated using fuel additives containing CeO2 nanoparticles for which the environmental (air quality and climate change) and public health impacts of this new technology are not known. Therefore, there is an absolute critical need for integrated exposure and toxicological studies in order to accurately assess the environmental, ecological and health implications of nanotechnology enabled diesel fuel additives with existing as well as new engine designs and fuel formulations.

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Sigma-Aldrich
Cerium, ingot, under oil, 99.9% trace rare earth metals basis
Sigma-Aldrich
Cerium, chips
Cerium, foil, 25x25mm, thickness 0.1mm, as rolled, 99.9%
Cerium, rod, 50mm, diameter 6.35mm, cast, 99.9%
Cerium, foil, 50x50mm, thickness 0.1mm, as rolled, 99.9%
Cerium, rod, 100mm, diameter 12.7mm, cast, 99.9%
Cerium, foil, not light tested, 50x50mm, thickness 0.025mm, as rolled, 99.9%
Cerium, rod, 50mm, diameter 12.7mm, cast, 99.9%
Cerium, wire reel, 50mm, diameter 1.0mm, hard, 99.9%
Cerium, rod, 100mm, diameter 6.35mm, cast, 99.9%
Cerium, wire reel, 100mm, diameter 1.0mm, hard, 99.9%
Cerium, wire reel, 25mm, diameter 1.0mm, hard, 99.9%
Cerium, foil, not light tested, 25x25mm, thickness 0.025mm, as rolled, 99.9%