| When wood products are exposed to environmental conditions conducive to biodeterioration, wood preservation becomes a necessity, especially when long term utilization is desired. When wood is pressure treated with preservative chemicals, the results obtained can be variable due to wood characteristics, treating process or characteristics of the treating solution. Most waterborne preservatives in the world market commonly use the readily available and cost effective biocides with active copper, which acts as a fungicide by causing precipitation of proteins within the fungi and interference with enzyme reactions.; In this study, two different treatment methods were compared in combination with four different solution concentrations and three different copper sources, chromated copper arsenate (CCA), copper sulfate (CuSul), and copper monoethanolamine (CuMEA) to investigate the adsorption phenomena of copper from preservative solution onto wood being treated. Additionally, the effects of directional permeability on retention and penetration of these preservatives and their leaching resistance were also examined.; Overall, when copper sources are considered, acidic CCA and alkaline CuMEA gave higher and similar copper adsorption results than does copper sulfate. (Abstract shortened by UMI.)... |
