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Efficacy of water-borne emulsion of copper naphthenate as preservative for northern red oak (Quercus rubra) and soft maple (Acer rubrum)

Wirksamkeit wässriger Emulsionen von Kupfernaphthenat zum Schutz von Eichen- und Ahornholz

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Abstract

Northern red oak (Quercus rubra) and red maple (Acer rubrum) cubes pressure treated with water brone formulation of copper naphthenate were evaluated for resistance to attack by brown fungiGloeophylleum trabeum (Pers. Ex Fr.) Murr. (Madison 617 ATCC 11539) andPoria placenta (Fr.) Cooke (Madison 698, ATCC 11538), white rot fungiTrametes versicolor (L. Ex FR.) Pilat (R-105 from Jeff Morrell),Irpex lacteus Fries (FP-105915 from Jeff Morrell) andPleurotus ostreatus (Jacq. Ex Fr.) Kummer (ATCC 32237), and soft rot fungiChaetomium globosum (ATCC 34152) andPhialophoria Sp. Wood samples measuring 19 by 19 by 19 mm were pressure treated to target copper retentions of 12.48 kg/m3 (0.78 pcf), 9.77 kg/m3 (0.61 pcf), 5.6 kg/m3 (0.35 pcf), 4.5 kg/m3 (0.30 pcf), 2.56 kg/m3 (0.16 pcf), 1.2 kg/m3 (0.075 pcf), 0.48 kg/m3 (0.03 pcf). Data from laboratory soil block tests indicate that at 2.0 ± 0.5 kg/m3 (0.13 pcf) copper retention from water borne copper naphthenate, the protection is similar to that from a 1.6 kg/m3 (0.10 pcf) elemental copper from oil borne copper nathenate or 7.2 kg/m3 (0.45 pcf) total oxide from CCA-C. Higher copper levels (3.0 ± 0.2 kg/m3) are needed to protect against copper tolerant brown rot fungusP. placenta. Results from an American Wood Preserver’s Association standard leaching test indicate that waterborne copper naphthenate treated samples retained 80 to 90% the copper initially absorbed. The amount of leached copper increases with the pH of the leaching solution.

Zusammenfassung

Eichen- und Ahornholz wurde unter Druck mit wässrigem Kupfernaphthenat imprägniert. Die Schutzwirkung gegenüber Braunfäule, Weißfäule und Moderfäule wurde mit folgenden Organismen geprüft:Gloephyllum trabeum, Poria placente, Trametes versicolor, Irpex lacteus, Pleurotus ostreatus, Chaetomium globosum undPhialophoria species. Holzproben der Abmessung 19 × 19 × 19 mm wurden unter Druck bis zu verschiedenen Kupferkonzentrationen zwischen 0,48 und 12,48 kg/m3 imprägniert. Mit der wässirgen Emulsion wurden bei einer Kupferkonzentration von 2 kg/m3 ähnliche Schutzwirkungen erzielt wie mit 1,6 kg/m3 auf Ölbasis oder 7,2 kg/m3 Gesamtoxid bei CCA-C-Schutzmitteln. Im Falle des BraunfäulepilzesP. placenta war eine höhere Kupferkonzentration (um 3 kg/m3) nötig. Nach Standard-Auswaschtests zeigte sich, daß die Proben 80 bis 90% der ursprünglich eingebrachten Kupfermenge zurückhielten. Die Menge des ausgelösten Kupfers steigt mit dem pH-Wert der Waschlösung.

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Authors and Affiliations

  1. Department of Forestry, Michigan State University, 48824-1222, East Lansing, Michigan

    D. P. Kamdem & R. Fair

  2. ISK Biosciences, 416 East Brooks Road, P.O. Box 9158, 38109, Memphis, Tennessee

    M. Freeman

Authors
  1. D. P. Kamdem
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  2. R. Fair
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  3. M. Freeman
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Additional information

This work was funded by USDA/CSRS grant no. 94-34158-0038, under the Michigan State University Eastern Hardwood Utilization program. A portion of this work was presented at The 26th meeting of IRG, June 1995, Helsingor, Denmark.

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Kamdem, D.P., Fair, R. & Freeman, M. Efficacy of water-borne emulsion of copper naphthenate as preservative for northern red oak (Quercus rubra) and soft maple (Acer rubrum). Holz als Roh-und Werkstoff 54, 183–187 (1996). https://doi.org/10.1007/s001070050163

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