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Effect of hot air post-treatments on copper leaching resistance in ACQ-D treated Chinese fir

Einfluss einer nachträglichen Heißluftbehandlung auf die Auswaschbeständigkeit von Kupfer in ACQ-D behandelter Spießtanne

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Abstract

Chinese fir (Cunninghamia lanceolata Hook.) wood cubes (19 × 19 × 19 mm3) were treated with amine copper quat-type D (ACQ-D) solution and fixed with different hot air post-treatments. The effects of temperature, relative humidity, duration, air circulation of post-treatment as well as the copper retention in the treated wood on copper leaching were investigated. With the help of ultraviolet or visible spectroscopy (UV/VIS), the valence conversion of copper in treated wood post-treated with optimal post-treatment conditions was investigated, and its relation with copper leaching was also discussed. The results showed that besides temperature and relative humidity, air circulation during hot air post-treatments also had a significant effect on accelerating copper fixation in ACQ-D treated wood. 70 °C, 80% R.H. with good air circulation provided a suitable condition for complete fixation of copper in a short period. After the applied post-treatments, up to 11.3% cupric copper reduced to cuprous form. A higher copper conversion rate usually corresponds to lower copper leaching, which is consistent with the contribution of lower water solubility cuprous copper.

Zusammenfassung

Spießtannenholzproben (Cunninghamia lanceolata Hook.) (19 × 19 × 19 mm3) wurden mit einer Aminkupfer-Lösung (ACQ-D) behandelt und mittels verschiedener Heißluftbehandlungen nachträglich fixiert. Der Einfluss der Temperatur, der relativen Luftfeuchte, der Dauer, der Luftzirkulation bei der Nachbehandlung sowie der Einfluss der Menge des eingebrachten Kupfers auf die Kupferauswaschung wurden untersucht. Mittels ultravioletter und sichtbarer Spektroskopie (UV/VIS) wurden im Holz mit optimaler Heißluftbehandlung die Valenzumwandlung von Kupfer und ihr Zusammenhang mit der Kupferauswaschung untersucht. Die Ergebnisse zeigten, dass neben der Temperatur und der relativen Luftfeuchte auch die Luftzirkulation bei der Heißluftbehandlung einen signifikanten Einfluss auf die beschleunigte Kupferfixierung in ACQ-D behandeltem Holz hat. 70 °C und 80% rel. Lf. sowie gute Luftzirkulation erwiesen sich als gute Bedingungen für eine vollständige Kupferfixierung innerhalb kurzer Zeit. Nach Durchführung der Nachbehandlungen war Kupfer(II) bis zu 11.3% in Kupfer(I) umgewandelt. Eine höhere Kupferumwandlungsrate geht gewöhnlich mit geringerer Kupferauswaschung einher. Dies steht im Einklang mit der geringeren Wasserlöslichkeit von Kupfer(I).

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Authors and Affiliations

  1. Dept. Wood Science and Technology, Beijing Forestry University, Qinghua Eastroad 35, 100083, Haidian, Beijing, China

    Lili Yu & Jinzhen Cao

  2. Faculty of Forestry, University of Toronto, 33 Willcocks St., M5S 3B3, Toronto, Ontario, Canada

    Paul A. Cooper & Y. Tony Ung

Authors
  1. Lili Yu
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  2. Jinzhen Cao
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  3. Paul A. Cooper
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  4. Y. Tony Ung
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Correspondence to Jinzhen Cao.

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Yu, L., Cao, J., Cooper, P.A. et al. Effect of hot air post-treatments on copper leaching resistance in ACQ-D treated Chinese fir . Eur. J. Wood Prod. 67, 457–463 (2009). https://doi.org/10.1007/s00107-009-0340-2

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  • DOI: https://doi.org/10.1007/s00107-009-0340-2

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