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Copper stabilization in ACQ-D treated wood: retention, temperature and species effects

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Abstract

The rates of stabilization or fixation of copper in ACQ-treated wood were compared for different post treatment conditioning temperatures (22°C and 50°C), solution concentrations (0.4–2.3%) and wood species. In some species, sapwood/heartwood differences were evaluated. The rate and extent of copper stabilization were estimated from changes in concentration of expressed solution at different times after treatment. The quality of the stabilization reaction was evaluated based on leaching performance of the wood after conditioning. Copper stabilized much faster at lower ACQ retentions and when conditioned at 50°C compared to high retentions and stabilization at 22°C. High retention treatments held without drying at 22°C could require five weeks or more for the copper to stabilize in the wood. Generally species effects were minor for the species evaluated, except for Douglas-fir in which copper reacted more quickly than in other species.

Zusammenfassung

Der Grad der Stabilisierung oder Fixierung von Kupfer in ACQ-behandeltem Holz wurde verglichen für Wärme-Nachbehandlungen bei 22°C und 50°C für Tränkkonzentrationen zwischen 0,4% und 2,3% und für verschiedene Holzarten. Rate und Ausmaß der Kupferstabilisierung wurden abgeschätzt aus der Konzentrationsänderung der zu verschiedenen Zeiten ausgepressten Tränklösung nach der Behandlung. Die Güte der Stabilisierungsreaktion wurde abgeschätzt anhand des Auslaugverhaltens nach der Konditionierung. Kupfer stabilisierte sich viel schneller bei geringeren ACQ-Konzentrationen und Konditionieren bei 50°C im Vergleich zu hohen Rückhaltekonzentrationen und Wärmebehandlung bei 22°C. Bei hohen Rückhaltekonzentrationen ohne Trocknung bei 22°C kann es bis zu fünf Wochen oder noch länger dauern, bis das Kupfer sich im Holz stabilisiert. Allgemein war der Einfluss der untersuchten Holzarten gering außer bei Douglasie; hier reagierte das Kupfer viel schneller als in anderen Holzarten.

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Authors and Affiliations

  1. Faculty of Forestry, University of Toronto, 33 Willcocks Street, Toronto, ON, Canada, M5S 3B3

    Y. Tony Ung & Paul A. Cooper

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  1. Y. Tony Ung
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  2. Paul A. Cooper
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Correspondence to Paul A. Cooper.

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Ung, Y.T., Cooper, P.A. Copper stabilization in ACQ-D treated wood: retention, temperature and species effects. Holz Roh Werkst 63, 186–191 (2005). https://doi.org/10.1007/s00107-004-0555-1

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  • DOI: https://doi.org/10.1007/s00107-004-0555-1

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