Effect of Extractive on Fixation and Leaching of ACC in Alder wood (Alnus Subcordata)

Wood extractive is a nonconstructional material which its effects on physicalcharacteristics have been proved. So it is assumed that it has some effect on wood preservative fixation. In order to understand this phenomenon, the fixation of “acid copper chromate“(ACC) in Alder wood blocks (Alnus subcordata) have been investigated in three status: Control (with extractive), pre-extracted with hot water and pre-extracted with ethanol acetone in 6 different times (0, 192, 384, 576 and 768 hours). The fixation processes in wood blocks have been observed by analytical instruments (Atomic absorption and UV-Vis spectroscopy) and the results were compared with another leaching of woody blocks (vacuum desiccator). The results showed that the water soluble extractive of hardwoods which are predominately tannins, mono and di and oligo-saccharides have positive effect on ACC fixation and removing of extractives increases the fixation of ACC in woody blocks and leaching of ACC specially copper (Cu) in Alder woods. Meanwhile, the fixation occurs at early stages before 192 hours.