Influence of water soluble extractives on CCA fixation and leaching performance of red maple and red oak

IRG/WP 97-30133

T Stevanovic-Janezic, P A Cooper, Y T Ung

We have observed several peculiarities in relation to CCA fixation in red maple and red oak woods such as high variability in fixation rates and leaching performance in maple and precipitate formation in solutions expressed from CCA treated red oak wood blocks at different stages of fixation. We have postulated that the extractives could be the factor of influence, as this has already been reported for CCA fixation in tannin containing softwoods. We therefore examined the influence of water soluble extractives on CCA fixation in red maple and in red oak. We performed a parallel study of CCA fixation in extracted (with water for red maple or with 5% ethanol solution in water for red oak) and unextracted wood blocks. We have determined an increase in CCA fixation rate for extracted red oak wood blocks, but a decreased CCA fixation rate in extracted red maple. The high leaching losses of all three elements observed for unextracted red oak blocks and of arsenic and copper from red maple were not observed for pre-extracted blocks. A particularly high decrease of leaching loss of chromium was observed for extracted wood blocks of both red maple and red oak.


Keywords: RED MAPLE; RED OAK; WATER (5% ETHANOL) EXTRACTED; CCA; FIXATION; LEACHING

Conference: 97-05-25/30 Whistler, British Columbia, Canada


Download document (578 kb)
free for the members of IRG. Available if purchased.

Purchase this document