Wood blocks from two softwoods and two tropical hardwoods species treated with different concentrations of CCA, CCB, and combinations of CrO3, CuS04, H3BO3 were subjected to the decay by brown rot fungus, Tyromyces palustris. CCA maintained good effect both in softwoods and hardwoods, while CCB and the other combinations lost their effectiveness after leaching. Chemicals leached from CCA treated wood were lower amount than the other preservatives. Chromium and arsenic leached more amount in hardwoods, and copper leached more amount in softwoods. Boron leached almost same amount both in softwood and hardwoods. Increase of ESCA O/C ratio in wood surface during treatments was more distinct in softwoods than in hardwoods. Chromium and copper reduction were different among wood species. Nitrogen redistribution to wood surface in treated wood during leaching was observed by ESCA. ESR spectra in treated wood were also examined to elucidate the changes of Cr and Cu through fixation.

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