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Title: Evaluation of wood treaed with copper-based preservatives for Cu loss during exposure to heat and copper-tolerant Bacillus licheniformis

Source: THE INTERNATIONAL RESEARCH GROUP ON WOOD PRESERVATION. IRG/WP 99-20155. 1999. pp. 1-8

Author(s)Crawford, Clausen

Publication Year: 1999  View PDF »

Category: Journal Articles

Abstract: Copper-based wood preservatives need to be effective against exposure to all types of microorganisms. Wood treated with six copper-based preservatives was exposed to 121C and 20 psi pressure for 15 minutes under standard autoclave conditions and the copper-tolerant bacterium, Bacillus licheniformis CC01, for 10 d at 28C and 150 rpm Sixteen to 37 percent of the copper was released from the wood during autoclaving, with copper citrate demonstrating the highest percent loss. Forty-four to 82 percent of the copper remaining in the samples following autoclaving was remove during exposure to the bacterium in liquid culture; copper naphthenate in oil and ACQ-D had losses of eighty percent or greater o the remaining copper. The bacterium removed as much or more total copper in 4 of 6 gas-sterilized samples (85-94%) than the cumulative effects of steam-sterilization and the bacterium on treated samples. Copper loss from in-service treated wood compromises the efficacy of copper-based wood preservatives.

Keywords: copper, preservatives, Bacillus licheniformis CC0l

File size: 155 kb(s)

Date posted: 05/20/2009
Current FPL Scientist associated with this product
Clausen, Carol A.
Supervisory Research Microbiologist
  

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