Determining the efficacy of low retentions of chromated copper arsenate preservatives for wood protection against basidiomycete decay fungi

Phang, Chia Lee. (2010) Determining the efficacy of low retentions of chromated copper arsenate preservatives for wood protection against basidiomycete decay fungi. [Final Year Project Report] (Unpublished)

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Abstract

Chromated copper arsenate (CCA) is an effective wood preservative that can protect wood from attacked by wood destroying agents such as decay fungi. However, there is worldwide concern on the withdrawal CCA from most residential applications. CCA has the potential for harming non-target organisms and cause acid environment, hence the need for applying low CCA retentions. This study determines the efficacy of low retention of CCA for wood protection against Basidiomycete decay fungi. Threshold CCA retention of the heanwood of Acacia mangium, undifferentiated heartwood or sapwood of Shorea macrophy/la and sapwood of Xylopia spp. were determined by exposure of treated wood to white decay fungi (Coriolus versicolor and Pycnoporus sanguineus) for 12 weeks by the soil jar decay test method. Overall, percentage mass losses of these wood species gradually reduced as the CCA retention applied increased, and determination of efficacy of low CCA retention is based on lowest percentage mass loss after decay test. Results showed that lower CCA retentions than permitted in the official Standards are able to protect wood against decay fungi, i.e. 0.2 kg/mJ for both Acacia mangium and Shorea macrophylla, and for Xylopia spp. at least Skg/m3 of CCA retention.

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