Citation:

Thorton, S., Todd P. Luxton, AND J. Clar. Variation in zinc release from surface coatings as a function of methodology. SCIENCE OF THE TOTAL ENVIRONMENT. Elsevier BV, AMSTERDAM, Netherlands, 788:147907, (2021). https://doi.org/10.1016/j.scitotenv.2021.147907

Impact/Purpose:

The manuscript compares surface wipe results from two different methods designed to quantify dermal exposure to chemicals and nanomaterials. In addition three different materials commonly used for the wipe method are compared using each technique. The results demonstrate how different exposure methods may lead to very different conclusions related to risk assessment. The manuscripts highlights the need to utilize standard methodologies for risk assessment and the issues that arise when comparing results from tests using different methods or materials.

Description:

Over the last decade the growth of “nano-enabled” products have exploded in both industrial and direct to consumer applications. One area of interest is surface coatings, including paints, stains and sealants. Large scale applications of the products raise questions about both short- and long-term effects to both human and environmental health. Release of nanoparticles (NPs) from surfaces as a function of dermal contact is recognized as a potential human exposure route. Several standardized methods to quantify nanomaterial release have been previously used. In the current study, two standardized method were used to quantify the total mass of NPs released during sampling. ZnO (NPs) were used as a case study as they are commonly added to surface coatings to increase UV resistance. Particles were dispersed in Milli-Q water or a deck stain and applied to sanded plywood surfaces. Total release of Zn due to simulated dermal contact was evaluated using the Consumer Product Safety Commission (CPSC) and National Institute for Occupational Safety and Health (NIOSH) wipe methods.

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