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, aspen
AbstractFixation 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.
American Society for Testing and Materials (ASTM). 2001. Annual Book of ASTM Standards, Volume 04.10 (Wood). West Conshohocken, PA.nAmerican Wood Preservers' Association (AWPA). 1996. American Wood Preservers' Association Book of Standards, Birmingham, AL. 21163-0286.nBull, D. C. 2001. The chemistry of chromated copper arsenate II. Preservative—wood interactions. Wood Sci. Technol. 34:459-466.nCarpenter, M. W., and D. J. Gardner. 1993. Fixation/leaching of CCA in selected hardwood species at two temperatures. Pages 41-49 in Chromium Containing Waterborne Wood Preservatives: Fixation and Environmental Issues. Forest Products Society, Madison, WI.nCoggins, C., and P. Hiscocks. 1978. Chromium on the surface of CCA treated wood. Int. Res. Group Wood Preserv. Doc. No. IRG/WP 386. Stockholm, Sweden.nCooper, P. A. 1998. Diffusion of copper in wood cell walls following vacuum treatment. Wood Fiber Sci. 30(4): 382-395.nCooper, P. A. 2003. Leaching of CCA—Facts and Contradictions. Proc. Am. Wood-Preserv. Assoc. 99:73-97.nCooper, P. A., and T. Ung. 1992. Accelerated fixation of CCA-treated poles. Forest Prod. J. 42(9):27-32.nCooper, P. A., and D. P. Kamdem. 1997. Fixation and leaching of red maple (Acer rubrum L.) treated with CCA-C. Forest Prod. J. 47(2):70-74.nDahlgren, S. E., and W. H. Hartford. 1972a. Kinetics and mechanism of fixation of Cu-Cr-As wood preservatives. Pt. I. pH behaviour and general aspects on fixation. Holzforschung 26(2):62-69.nDahlgren, S. E., and W. H. Hartford. 1972B. Kinetics and mechanism of fixation of Cu-Cr-As wood preservatives. Pt. II. Fixation of Boliden K33. Holzforschung 26(3):105-113.nDawson-Andoh, B. E., J. J. Slahor, L. Osborn, and L. McDonald. 2000. Effect of pre-extraction by different solvent systems on leaching of CCA components from treated Appalachian hardwoods. Forest Prod. J. 52(10): 62-66.nEffland, M. J. 1977. Modified procedure to determine acidinsoluble lignin in wood and pulp. Tappi J. 60(10):143-144.nJin, L., and A. F. Preston. 1993. Depletion of preservatives from treated wood: Results from laboratory, fungus cellar and field tests. The Int. Res. Group on Wood Preserv. Doc. IRG/WP 93-50001:7. Stockholm, Sweden.nJorge, F. C., T. M. Santos, J. P. De Jesus, and W. B. Banks. 1999. Reactions between Cr(VI) and wood and its model compounds Part 2: Characterisation of the reaction products by elemental analysis, magnetic susceptibility and FTIR. Wood Sci. Technol. 33:501-517.nKamdem, D. P., E. Vlna, and P. A. Cooper. 1996. Fixation and leaching of CCA-C treated eastern hardwood species. Proc. Can. Wood Preserv. Assoc. 17:135-146.nKazi, F. K. M., and P. A. Cooper. 2000. Kinetic model of CCA fixation on wood. Part I. The initial reaction zone. Wood Fiber Sci. 32(3):354-361.nKennedy, M. J., and G. Palmer. 1994. Leaching of copper, chromium and arsenic from CCA-treated slash pine heartwood. The Int. Res. Group on Wood Preserv. Doc. IRG/WP 94-50020. Stockholm, SwedennLebow, S. 1996. Leaching of wood preservative components and their mobility in the environment—Summary of pertinent literature. USDA Gen. Tech. Rep. FPL-GTR-93. Forest Products Laboratory, Forest Service, Madison, WI. 36 pp.nLevitin, N. 1972. The coloring of mineral-stained maple. Wood Sci. 5(2):87-94.nMcNamara, W. S. 1989. CCA fixation experiments—Part I. The Int. Res. Group on Wood Preserv. Doc. IRG/WP 3504. Stockholm, Sweden.nNarayanan, V., and T. R. Seshadri. 1969. Chemical components of Acer rubrum wood and bark: Occurrence of procyanidin dimer and trimer. Indian J. Chem. 7:213-214.nPizzi, A. 1981. The chemistry and kinetic behavior of Cu-Cr-As/B wood preservatives. I. Fixation of chromium on wood. J. Polym. Sci. Pol. Chem. 19:3093-3121.nPizzi, A., 1982. The chemistry and kinetic behavior of Cu-Cr-As/B wood preservatives. IV. Fixation of CCA to wood. J. Polym. Sci. Pol. Chem. 20:739-764.nPizzi, A., W. E. Conradie, and A. Jansen. 1986. Polyflavonoid tannins—a main cause of soft-rot failure in CCA-treated timber. Wood Sci. Technol. 20:71-81.nRowe, J. W., and A. H. Conner. 1979. Extractives in eastern hardwoods—A review. USDA Gen. Tech. Rep. FPL 18. Forest Products Laboratory, Forest Service. Madison, WI. 67 pp.nSmith, D. N. R., and A. I. Williams. 1973. The effect of composition on the effectiveness and fixation of copper/chrome/arsenic and copper/chrome preservatives. Part I: Effectiveness. Wood Sci. Technol. 7:60-76.nStevanovic-Janezic T., P. Cooper, and T. Ung. 2000. Chromated copper arsenate preservative treatment of North American hardwoods. Part 1: CCA Fixation performance. Holzforschung 54:577-584.nStevanovic-Janezic T., P. Cooper, and T. Ung. 2001. Chromated copper arsenate preservative treatment of North American hardwoods. Part 2: Leaching performance. Holzforschung 55: 7-12.nTAPPI T204 os-76 Standard. Technical Association of the Pulp and Paper Industry, Atlanta, GA.nTattar, T. A., and A. E. Rich. 1973. Extractable phenols in clear, discolored, and decayed woody tissues and bark of sugar maple and red maple. Phytopathology 63:167-169.nTaylor, A., and P. Cooper. 2002. The effect of stem girdling on wood quality. Wood Fiber Sci. 34(2):212-220.nUng, Y. T., A. Taylor, and P. A. Cooper. 1998. The effect of felling time of year on CCA fixation rate and quality of selected hardwoods. The Int. Res. Group on Wood Preserv. Doc. IRG/WP 98-40116. Stockholm, Sweden.nWilson, A. 1971. The effects of temperature, solutions strength and timber species on the rate of fixation of a copper-chrome-arsenate wood preservative. J. Inst. Wood Sci. 5(6):36-40.nWise, L. E., M. Murphy, and A. A. D'Addieco. 1946. Chlorite holocellulose, its fractionation and bearing on summative wood analysis and studies on the hemicelluloses. Paper Trade J. 122(2):35-43.nZobel, B. J., and R. L. McElwee. 1966. Variation of Cellulose in loblolly pine. Tappi J. 49(9):383-387.nZule, J., and A. Moze. 2003. GC analysis of extractive compounds in beech wood. J. Sep. Sci. 26:1292-1294.n
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