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detailed Standard Operating Procedure for working with nanomaterials should be written to provide guidance on appropriate work practices, engineering controls, personal protective equipment , and waste disposal practices depending on the risk level of a particular nanomaterial or process involving a nanomaterial. Nanomaterials include any materials or particles that have an external dimension in the nanoscale (~1-100nm). Nanomaterials are both naturally occurring in the environment and intentionally produced. Intentionally produced nanomaterials are referred to as Engineered Nanomaterials . Materials whose properties do not differ significantly between their nanoscale and larger forms are generally excluded from ENMs. The most common types of ENMs are carbon based materials such as nanotubes, metals and metal oxides such as silver and zinc oxide, and quantum dots made of compounds such as zinc selenide (Table 3.1). Reproductive toxins can affect the reproductive health of both men

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