A major area of growth for “nano-enabled” products has been the addition of nanoparticles (NPs) to surface coatings including paints, stains and sealants. Zinc oxide (ZnO) NPs, long used in sunscreens and sunblocks, have found growing use in surface coatings to increase their UV resistance, although conditions under which these NPs may be removed from the coated surfaces is poorly understood. In this study, 20 nm ZnO NPs were dispersed in either Milli-Q water, or a commercial deck stain. Diluted ZnO NP solutions were painted on sanded pine plywood and estimates of dermal transfer generated using two methods, an apparatus-based method previously developed by the Consumer Product Safety Commission, and a hand wiping method previously developed by the National Institute for Occupational Safety and Health. Moreover, three different types of sample cloths (Texwipes, Ghostwipes, and lambskin condom) were tested using both methods to highlight variability in risk assessment based on method. The results showed that the NIOSH handwipe method released significantly less zinc than the CPSC apparatus method, demonstrating how slight variations in research methodology can drastically alter exposure estimates and thereby risk assessment.

Quantifying nanoparticle release from surface coatings via dermal transfer

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.