The results of an experiment showing the kinetics of the dissociation of CCA compo-nents in water within treated wood samples are presented. Dry red pine (Pinus resinosa Ait.) samples were simultaneously vacuum-treated with water, then expressed to re-move the water at successive time intervals. The expressate was then analyzed for Cr, Cu, and As concentration by inductively coupled plasma (ICP). Dissolved ion concen-trations increased for approximately 24 hours then reached relatively high equilibrium values which did not seem to depend on CCA loading in the wood. This detailed kinetic information is essential to understanding and predicting the leaching of fixed CCA.

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