Abstract
The environmental and health effects of nanomaterials represent significant emerging risks. However, there is at present rather limited knowledge regarding the ways in which nanomaterials might be released from products and enter the environment or how they are transported and accumulate in ecosystems. Additional data is therefore needed to estimate the possible release of nanomaterials at various stages of the life- cycle to allow identification of potential pathways into the environment. Available tools for risk assessment of nanomaterials are reviewed with the aim of identifying unknowns and uncertainties and data requirements. To carry out risk assessment it is first necessary to determine where nanomaterials are likely to present hazards that are different from those of conventional chemicals and therefore where the challenges will be greatest. Some of the limitations of current risk assessment methodologies for nanomaterials are examined.
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