Assessing the release of copper from nanocopper-treated and conventional copper-treated lumber into marine waters II: Forms and bioavailability.

Autor: Parks AN; Southern California Coastal Water Research Project, Costa Mesa, California, USA., Cantwell MG; Office of Research and Development/National Health and Environmental Effects Research Laboratory, Atlantic Ecology Division, US Environmental Protection Agency, Narragansett, Rhode Island, USA., Katz DR; Office of Research and Development/National Health and Environmental Effects Research Laboratory, Atlantic Ecology Division, US Environmental Protection Agency, Narragansett, Rhode Island, USA., Cashman MA; Department of Geosciences, University of Rhode Island, Kingston, Rhode Island, USA., Luxton TP; Office of Research and Development/National Risk Management Research Laboratory, Land and Materials Management Division, US Environmental Protection Agency, Cincinnati, Ohio, USA., Clar JG; Elon University, Elon, North Carolina, USA., Perron MM; Office of Pesticide Programs, Office of Chemical Safety and Pollution Prevention, US Environmental Protection Agency, Washington, DC, USA., Portis L; Lifespan Ambulatory Care Center, East Greenwich, Rhode Island, USA., Ho KT; Office of Research and Development/National Health and Environmental Effects Research Laboratory, Atlantic Ecology Division, US Environmental Protection Agency, Narragansett, Rhode Island, USA., Burgess RM; Office of Research and Development/National Health and Environmental Effects Research Laboratory, Atlantic Ecology Division, US Environmental Protection Agency, Narragansett, Rhode Island, USA.
Jazyk: angličtina
Zdroj: Environmental toxicology and chemistry [Environ Toxicol Chem] 2018 Jul; Vol. 37 (7), pp. 1969-1979. Date of Electronic Publication: 2018 May 11.
DOI: 10.1002/etc.4140
Abstrakt: One application of nanocopper is as a wood-preserving pesticide in pressure-treated lumber. Recent research has shown that pressure-treated lumber amended with micronized copper azole (MCA), which contains nanosized copper, releases copper under estuarine and marine conditions. The form of copper released (i.e., ionic, nanocopper [1-100 nm in size]) is not fully understood but will affect the bioavailability and toxicity of the metal. In the present study, multiple lines of evidence, including size fractionation, ion-selective electrode electrochemistry, comparative toxicity, and copper speciation were used to determine the form of copper released from lumber blocks and sawdust. The results of all lines of evidence supported the hypothesis that ionic copper was released from MCA lumber and sawdust, with little evidence that nanocopper was released. For example, copper concentrations in size fractionations of lumber block aqueous leachates including unfiltered, 0.1 μm, and 3 kDa were not significantly different, suggesting that the form of copper released was in the size range operationally defined as dissolved. These results correlated with the ion-selective electrode data which detects only ionic copper. In addition, comparative toxicity testing resulted in a narrow range of median lethal concentrations (221-257 μg/L) for MCA lumber blocks and CuSO 4 . We conclude that ionic copper was released from the nanocopper pressure-treated lumber under estuarine and marine conditions. Environ Toxicol Chem 2018;37:1969-1979. Published 2018 Wiley Periodicals Inc. on behalf of SETAC. This article is a US government work and, as such, is in the public domain in the United States of America.
(Published 2018 Wiley Periodicals Inc. on behalf of SETAC. This article is a US government work and, as such, is in the public domain in the United States of America.)
Databáze: MEDLINE
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