Effects of CCA-C Preservative Retention and Wood Species on Fixation and Leaching of CR, CU, and AS
Keywords:
CCA, fixation and leaching, CCA retention, red maple, red pine, aspenAbstract
Fixation of chromated copper arsenate (CCA-C) preservative was investigated using ground sapwood of trembling aspen, red pine, and red maple at treatment retentions of 4.0, 6.4, 9.6, and 30 kg/m3 at 30°C. The fixation of (CCA) wood preservative differed considerably among the wood species and was affected by treatment retention, resulting in differences in subsequent leaching of the "fixed" components. For the wood species considered, the fixation times increased with increasing retention for the Cr and Cu components but decreased with increasing retention for As. Red pine and aspen had similar fixation patterns and similar leaching trends and levels of leaching losses. Red maple had significantly faster CCA fixation than red pine and aspen but had elevated Cr and As leaching. These fixation anomalies decreased with an increase in treatment retention, and after removal of hot-water-soluble extractives. It is postulated that extractives impair the quality of fixation owing to their high reducing capacity toward Cr(VI) and capability to complex Cu(II) and Cr(III). Irregular CCA fixation in red maple results in incomplete fixation of As due to reduced availability of Cr in a form that can complex As.References
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