biostudies-literatureJohnson MGIntramural EPAUS Environmental Protection Agency117189https://www.ebi.ac.uk/biostudies/studies/S-EPMC9299944biostudies-literatureUnknown287Micronized Cu (μ-Cu) is used as a wood preservative, replacing toxic chromated copper arsenate (CCA). Micronized Cu is malachite [Cu₂CO₃(OH)₂] that has been milled to micron/submicron particles, with many particle diameters less than 100 nm, mixed with biocides and then used to treat wood. In addition to concerns about the fate of the Cu from μ-Cu, there is interest in the fate of the nano-Cu (n-Cu) constituents. We examined movement of Cu from μ-Cu-treated wood after placing treated-wood stakes into model wetland ecosystems. Release of Cu into surface and subsurface water was monitored. Surface water Cu reached maximum levels 3 days after stake installation and remained elevated if the systems remained inundated. Subsurface water Cu levels were 10% of surfEnvironmental pollution (Barking, Essex : 1987)Transformation and release of micronized Cu used as a wood preservative in treated wood in wetland soil.PMC9299944EPA999999Storm MJAndersen CPBollman MAJohnson MGReichman JRRygiewicz PTKing GANash MSLuxton TPfalseTransformation and release of micronized Cu used as a wood preservative in treated wood in wetland soil.Micronized Cu (μ-Cu) is used as a wood preservative, replacing toxic chromated copper arsenate (CCA). Micronized Cu is malachite [Cu₂CO₃(OH)₂] that has been milled to micron/submicron particles, with many particle diameters less than 100 nm, mixed with biocides and then used to treat wood. In addition to concerns about the fate of the Cu from μ-Cu, there is interest in the fate of the nano-Cu (n-Cu) constituents. We examined movement of Cu from μ-Cu-treated wood after placing treated-wood stakes into model wetland ecosystems. Release of Cu into surface and subsurface water was monitored. Surface water Cu reached maximum levels 3 days after stake installation and remained elevated if the systems remained inundated. Subsurface water Cu levels were 10% of surf2021-01-01T00:00:00Z2021 Oct2025-04-22T01:57:45.253Z2025-04-05T20:10:34.665ZS-EPMC92999443402366010.1016/j.envpol.2021.117189