Abstract
The number of products containing nanotechnology has been growing in the last few years. Nanotechnology offers the prospect of significant advances that can improve the quality of life and help preserve the environment. The purpose of this chapter is to present definitions and information on risk assessment and toxicity of nanomaterials. An important point to note is the difficulty in comparing the toxicity results of nanoscale materials available in the current literature, due not only to the wide variety of methods of synthesis and preparation of nanomaterials but also the lack of regular work reporting an adequate physical-chemical characterization of the sample used in the studies. Also, before starting any nanotoxicology study, it is imperative to know the characteristics of the nanoparticles to be used, and in particular their size and distribution.
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