Abstract
Most studies on preservative depletion from treated wood are performed with small samples on a laboratory scale. Although these studies provided repeatable and constant test parameters, the results have little applicability to real conditions. Therefore, a series of laboratory tests were carried out according to CEN/TS 15119 part 1 and part 2 by means of EN 252 and non-standard sized Scots pine sapwood as well as spruce stakes. The stakes were impregnated by vacuum pressure with chromium (Cr)-copper(Cu)-containing wood preservative. For comparison, a set of 18 stakes per test parameter was installed at a test site (in ground use), whereby, every 4 months, three stakes from each series were removed for analysis. Both the time depending losses of metal as well as the remaining element contents were determined for samples exposed under lab conditions, whereas distribution and remaining element contents were measured for samples exposed in the field. The obtained data were evaluated regarding factors influencing the metal leaching, such as exposure time, wood species, or dimension. The results showed that wood species had a significant effect on the Cu depletion, while it had less influence on the Cr loss. Cr and Cu distribution in the standard and non-standard sized pine sapwood significantly changed as compared to spruce. In addition, comparison of the laboratory and field test results indicated that metal depletion is greater in field exposure compared to both laboratory tests.
Acknowledgments
The first author thanks Mrs. Karin Brandt for experimental help.
References
Archer, K., Preston, A., Chittenden, M., Page, R. (1994) Depletion of wood preservatives after four years’ marine exposure in Mt. Maunganui Harbour, NZ. Int. Res. Group Wood Preserv., IRG/WP 94-50036.Search in Google Scholar
Augusta, U. Untersuchung der natürlichen Dauerhaftigkeit wirtschaftlich bedeutender Holzarten bei verschiedener Beanspruchung im Außenbereich. PhD Dissertation. Centre Wood Sci., University of Hamburg, Hamburg, 2007.Search in Google Scholar
Baines, E.F., Saur, J.M. (1985) Preservative treatment of spruce and other refractory species. Proc. Amer. Wood Preserv. Assoc. 81:136–147.Search in Google Scholar
Biocidal Products Directive, 98/8/EC. (1998) Official Journal of the European Communities, L 123:1–63.Search in Google Scholar
CEN/TS 15119-1. Durability of wood and wood-based products. Determination of emissions from preservative treated wood to the environment. Part 1: Wood held in the storage yard after treatment and wooden commodities in Use Class 3 (not covered, not in contact with the ground). Laboratory method. BSI, London, 2008.Search in Google Scholar
CEN/TS 15119-2. Durability of wood and wood-based products. Determination of emissions from preservative treated wood to the environment. Part 2. Wooden commodities in Use Class 4 or 5 (in contact with the ground, fresh water or sea water). Laboratory method. BSI, London, 2008.Search in Google Scholar
Choi, S., Ruddick, J.R., Morris, P. (2004) Chemical redistribution in CCA treated decking. For. Prod. J. 54:33–37.Search in Google Scholar
Cockroft, R., Laidlaw, R.A. (1978) Factors affecting leaching of preservatives in practice. Int. Res. Group Wood Preserv. IRG/WP 3113.Search in Google Scholar
Cooper, P.A. (1990) Leaching of CCA from treated wood. Proc. Canad. Wood Preserv. Assoc. 11:144–169.Search in Google Scholar
Cooper, P.A. (1991) Leaching of CCA from treated wood: pH effects. For. Prod. J. 41:30–32.Search in Google Scholar
Cooper, P.A. (1994) Leaching of CCA: is it a problem? In: Environmental Considerations in the Manufacture, use and Disposal of Pressure-treated Wood. For. Prod. Soc. Madison, WI, USA.Search in Google Scholar
Cooper, P.A., Ung, Y.T. (1997) Environmental impact of CCA poles in service. Int. Res. Group Wood Preserv. IRG/WP 97-50087.Search in Google Scholar
DIN 52161. Nachweis von Holzschutzmitteln im Holz. Bestimmung des Gehaltes von kupfer- und chromhaltigen Holzschutzmitteln, 1985.Search in Google Scholar
EN 252. Wood preservatives. Field test methods for determining the relative protective effectiveness in ground contact. European committee for standardization. European Commission, Brussels, Belgium, 1990.Search in Google Scholar
Evans, F.G., Edlund, M.L. (1993) Leaching from field test stakes: Results from two different methods of analysis. Int. Res. Group Wood Preserv., IRG/WP 93-50013.Search in Google Scholar
Evans, F.G., Nossen, B., Edlund, M.L. (1994) Leaching from field test stakes, Part 2: The distribution in and leaching from different parts of test stakes. Int. Res. Group Wood Preserv., IRG/WP 94-50026.Search in Google Scholar
Garcia-Valcarcel, A.I., Bravo, I., Jimenez, C., Tadeo, J.L. (2004) Influence of leaching medium and drying time between successive leaching periods on the emission of chromium, copper, and boron from treated wood. Environ. Toxicol. Chem. J. 23: 2682–2688.10.1897/03-685Search in Google Scholar PubMed
Habicht, J., Hantzschel, D., Wittenzellner, J. (2003) Influence of different fixation and ageing procedure on the leaching behavior of copper from selected wood preservatives in laboratory trials. Int. Res. Group Wood Preserv., IRG/WP 03-20264.Search in Google Scholar
Haloui, A., Vergnaud, J.M. (1997) Study of the release in water of chemicals used for wood preservation. Effect of wood dimensions. Wood Sci. Technol. 31:51–62.Search in Google Scholar
Hayes, C., Curran, P.M.T., Hynes, M.J. (1994) Preservative leaching from softwoods submerged in Irish Coastal waters as measured by atomic-absorption spectrophotometry. Holzforschung 48:463–473.10.1515/hfsg.1994.48.6.463Search in Google Scholar
Jacobs, K., Scheiding,W., Plaschkies, K., Weiß, B., Rangno, N., Flade, P. (2013) Molekulare Biotechnologie zur Analyse des Holzabbaus im Freiland. Abschlussbericht. Institut Holztechnologie Dresden. FKZ VF090010, 115 S.Search in Google Scholar
Jüngel, P., Melcher, E., Peek, R.D. (1998) The non-uniform uptake of chromium and copper during the impregnation of wood using the example of a CCB-salt. Int. Res. Group Wood Preserv., IRG/WP 98-20137.Search in Google Scholar
Lebow, S. (1996) Leaching of wood preservative components and their mobility in the environment. General Technical Report FPL-GTR-93, US Department of Agriculture, For. Pro. Lab., Madison, WI, USA.10.2737/FPL-GTR-93Search in Google Scholar
Lebow, P., Ziobro, R., Sites, L., Schultz, T., Pettry, D., Nicholas, D., Lebow, S., Kamdem, P., Fox, R., Crawford, D. (2006) Statistical analysis of influence of soil source on leaching of arsenic and copper from CCA-C treated wood. Wood Fiber Sci. 38:439–449.Search in Google Scholar
Lebow, S., Lebow, P., Woodward, B., Halverson, S., Abott, W., West, M. (2009) Efficacy of a borax-copper preservative in exposed applications. Research paper, FPL-RP-655, US Department of Agriculture, For. Prod. Lab, Madison, WI, USA.10.2737/FPL-RP-655Search in Google Scholar
Lee, M.J., Cooper, P. (2012) Copper precipitation of Cu-monoethanolamine preservative in wood. Holzforschung 66:1017–1024.10.1515/hf-2012-0014Search in Google Scholar
Lee, M.J., Pankras, S., Cooper, P. (2014) Appearance, corrosion properties, and leach resistance of spruce and pine wood treated with Mea modified micronized copper preservative (MCu). Holzforschung 68:477–486.10.1515/hf-2013-0088Search in Google Scholar
Mahr, M.S., Hübert, T., Stephan, I., Bücker, M., Militz, H. (2013) Reducing copper leaching from treated wood by sol-gel derived TiO2 and SiO2 depositions. Holzforschung 67:429–435.10.1515/hf-2012-0105Search in Google Scholar
Melcher, E. (1998) Leaching of components from CCF treated timber in ground contact. Int. Res. Group Wood Preserv., IRG/WP 98-50108.Search in Google Scholar
Melcher, E., Wegen, H.W. (2000) The remaining concentration of inorganic wood preservative components in EN 252 stakes after ground contact. Int. Res. Group Wood Preserv., IRG/WP 00-50159.Search in Google Scholar
Meyer, L., Brischke, C., Melcher, E., Brandt, K., Lenz, M.-T., Soetbeer, A. (2014) Durability of English oak (Quercus robur L.) – <softenter;Comparison of decay progress and resistance under various laboratory and field conditions. Int. Biodet. Biodegr. 68:79–85.Search in Google Scholar
Murphy, R., Dickinson, D. (1990) The effect of acid rain on CCA treated timber. Int. Res. Group Wood Preserv., IRG/WP 99-3579.Search in Google Scholar
Pankras, S., Cooper, P.A. (2012) Effect of ammonia addition to alkaline copper quaternary wood preservative solution on the distribution of copper complexes and leaching. Holzforschung 66:397–406.10.1515/hf.2011.155Search in Google Scholar
Pankras, S., Cooper, P.A., Wylie, S. (2012) Relationship between copper species in solution and leaching from alkaline copper quat (ACQ) treated wood. Holzforschung 66:505–514.10.1515/hf.2011.179Search in Google Scholar
Regulation (EU) No 528/2012 of the European Parliament and of the Council of 22 May 2012 concerning the making available on the market and use of biocidal products. Official Journal of the European Union L167/1.Search in Google Scholar
Schoknecht, U., Wegner, R., Melcher, E., Seidel, B., Kussatz, C., Maletzki, D. (2004) The influence of test parameters on the emission of biocides from preservative-treated wood in leaching tests. Umweltforschungsplan Bundesministeriums Umwelt, Naturschutz und Reaktorsicherheit. Förderkennzeichen (UFOPLAN) 20367441. Bundesanstalt für Materialprüfung und -forschung, Abschlussbericht, Berlin. pp. 161 S.Search in Google Scholar
Schultz, T.P., Militz, H., Freeman, M.H., Goodell, B., Nicholas, D. Eds. (2008) Development of Commercial Wood Preservatives. Efficacy, Environmental, and Health Issues. ACS Symposium Series 982, American Chemical Society, Washington, DC. pp. 655.10.1021/bk-2008-0982Search in Google Scholar
Smith, D.N.R., Williams, A.I. (1973a) The effect of composition on the effectiveness and fixation of copper-chrome-arsenic and copper-chrome preservatives. Part II: selective absorption and fixation. Wood Sci. Technol. 7:142–150.10.1007/BF00351156Search in Google Scholar
Smith, D.N.R., Williams, A.I. (1973b) The effect of composition on the effectiveness and fixation of copper-chrome-arsenic and copper-chrome preservatives: Part I: effectiveness. Wood Sci. Technol. 7:60–76.10.1007/BF00353379Search in Google Scholar
Taylor, J.L., Cooper, P.A. (2005) Effect of climatic variables on chromated copper arsenate (CCA) leaching during aboveground exposure. Holzforschung 59:467–472.10.1515/HF.2005.077Search in Google Scholar
Temiz, A., Yildiz, U.C., Nilsson, T. (2006) Comparison of copper emission rates from wood treated with different preservatives to the environment. Build. Environ. 41:910–914.Search in Google Scholar
Thaler, N., Humar, M. (2014) Copper leaching from copper-ethanolamine treated wood: comparison of field test studies and laboratory standard procedures. Bioresources 9:3038–3051.10.15376/biores.9.2.3038-3051Search in Google Scholar
Wilson, 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. 5:36–40.Search in Google Scholar
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