Leaching studies and fungal resistance of potential new wood preservatives

New inorganic wood preservatives based on chromated copper arsenate (CCA) have been formulated by replacing arsenic with molybdenum (Mo), tungsten (W), or zinc (Zn) phytate. The new preservatives are expected to exhibit lower human toxicity than CCA. CCMo and CCW have been examined by leaching tests and fungal exposure. The leaching of all elements of the CCW wood preservative is similar to that of CCA on a molar basis. CCW or CCMo treatment of wood blocks rendered them as resistant or more resistant to a brown-rot fungus than CCA at similar concentrations. The formulation containing zinc phytate was deemed unacceptable for this use due to poor solution stability and high component leaching.

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