Dermal Transfer and Environmental Release of CeO Nanoparticles Used As UV Inhibitors on Outdoor Surfaces: Implications for Human and Environmental Health

Overview

Journal Sci Total Environ

Date 2017 Sep 23

PMID 28938214

Citations 10

Authors

Justin G Clar

William E Platten 3rd

Eric J Baumann Jr

Andrew Remsen

Steve M Harmon

Christina L Bennett-Stamper

Treye A Thomas

Todd P Luxton

Affiliations

Soon will be listed here.

Abstract

A major area of growth for "nano-enabled" consumer products have been surface coatings, including paints stains and sealants. Ceria (CeO) nanoparticles (NPs) are of interest as they have been used as additives in these these products to increase UV resistance. Currently, there is a lack of detailed information on the potential release, and speciation (i.e., ion vs. particle) of CeO NPs used in consumer-available surface coatings during intended use scenarios. In this study, both Micronized-Copper Azole pressure-treated lumber (MCA), and a commercially available composite decking were coated with CeO NPs dispersed in Milli-Q water or wood stain. Coated surfaces were divided into two groups. The first was placed outdoors to undergo environmental weathering, while the second was placed indoors to act as experimental controls. Both weathered surfaces and controls were sampled over a period of 6months via simulated dermal contact using methods developed by the Consumer Product Safety Commission (CPSC). The size and speciation of material released was determined through sequential filtration, total metals analysis, X-Ray Absorption Fine Structure Spectroscopy, and electron microscopy. The total ceria release from MCA coated surfaces was found to be dependent on dispersion matrix with aqueous applications releasing greater quantities of CeO than stain based applications, 66±12mg/m and 36±7mg/m, respectively. Additionally, a substantial quantity of CeO was reduced to Ce(III), present as Ce(III)-organic complexes, over the 6-month experimental period in aqueous based applications.

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