Leaching resistance of copper amine-treated Scots pine

The depletion of copper and amine from copper amine- and amine-treated Scots pine blocks was investigated. For copper amine-treated blocks, the greatest leaching resistance was found for copper monoethanolamine and copper polyimine treatments, which retained more than 80 percent copper when leached in water and more than 50 percent when leached with a citrate buffer. This was explained by the loss of precipitated amine-copper compounds during buffer leaching. Leached amine-treated blocks also showed residual amine, suggesting the formation of compounds with wood derivatives, possibly amine acid salts with acidic functionality in hemicellulose. The amine to copper mole ratio in leached wood was 1, confirming that considerable amine is lost during leaching, and that the resulting complexes in wood contain copper bound to amine.

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