The increased use of engineered nanoparticles (NPs) in consumer products has raised questions concerning their potential to cause negative environmental and human health impacts upon release. Of interest are commercially available NP-based surface coatings including paints, stains, and sealants as they represent an area of direct contact between the product, the consumer, and the surrounding environment. In this study, pristine and aged (1-year outdoor) Micronized-Copper pressure treated lumber, were coated with ZnO NPs dispersed in Super-Q Water or commercially available wood stain. After coatings, subsections of material were placed coated side down in Synthetic Precipitation Leaching Solution for a period of 72 h. The resulting leachate was fractionated through sequential filtration (0.45um and 10 kda filters) to differentiate between ionic and particulate release while Zinc and Copper concentrations were determined through Atomic Spectroscopy. The initial results indicate the NP release is greatly affected by dispersion matrix (water vs. stain) and initial NP size. Additional experiments are ongoing to determine effect of surface aging on release characteristics.<br/>

Release of ZnO nanoparticles used in surface coatings: Effects of NP size on leaching characteristics

255th National Meeting (2018)

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