Skip to Main Content
Estimating preservative release from treated wood exposed to precipitationAuthor(s): Stan Lebow; Patricia Lebow; Daniel Foster
Source: Wood and fiber science. Vol. 40, no. 4 (Oct. 2008): Pages 562-571.
Publication Series: Miscellaneous Publication
PDF: Download Publication (228 KB)
DescriptionAccelerated leaching methods are needed to better estimate emissions from treated wood used above ground or above water. In this study, we evaluated leaching methods using continuous immersion, dip immersion, and simulated rainfall approaches. Copper and/or boron emissions were measured for specimens treated with either chromated copper arsenate Type C (CCA-C) or a borax-copper (BC) preservative. The results of these leaching tests were compared with the extent of wetting and drying within the specimens and with the published reports of leaching and MC under natural exposures. Release per unit surface area was generally greatest with the simulated rainfall or constant immersion methods, but the relationship between the methods was dependent on the leaching characteristics of the specific preservative formulation. The lowest emissions were found for small specimens exposed to dip immersions. Comparison of the simulated rainfall results to published values indicates that the rainfall method and dip immersion scenarios underestimate copper release from wood exposed outdoors, and that the methods evaluated do not adequately simulate the wetting and drying conditions encountered in natural exposures. Further research is needed to better characterize the wetting and drying of in-service treated wood and to adapt test methods to more closely simulate these conditions.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationLebow, Stan; Lebow, Patricia; Foster, Daniel. 2008. Estimating preservative release from treated wood exposed to precipitation. Wood and Fiber Science 40(4): 562-571.
KeywordsWood moisture, moisture, precipitation, borax, boron, water pollution, Leaching, methods, moisture content, treated wood, service life, preservative treated wood, wood preservatives, leaching, arsenic, copper, chromium, preservatives, boron compounds, preservative treatments, environmental aspects, southern pine, CCA, chromated copper arsenate
- Technical Note: Comparison of accelerated methods for evaluating leaching from preservative-treated wood
- The role of moisture content in above-ground leaching
- Laboratory immersion method for accelerated prediction of preservative leaching from pressure-treated wood exposed to precipitation
XML: View XML