POPULUS NIGRA VAR. PYRAMIDALIS در چوب تبريزي ACC بررسي اثر دما بر فرآيند تثبيت محلول حفاظتي سكلور

Investigation on the influence of temperature on fixation process of ACC in poplar wood

In this study, the fixation speed of 2% Celcure (ACC) preservative in three different temperatures (10,20 and 30ʹC) in poplar (Populus nigra Var. Pyramidalis) wood was examined. The 2 by 2 by 2 cm wood blocks from sapwood and heartwood with 14% moisture content were impregnated with the celcure solution. The impregnated blocks then were exposed to different temperatures. In each temerature, the blocks were chosen periodically and squeezed to extract the solution. The extracted solutions were analyzed to determine the concentration of chromiumv1 using diphenyl carbazide method. The process was continued until 99.8% of chromium is fixed. The results showed that temperature plays an important role in the fixation process. In general, fixation in sapwood was faster than heartwood. The fastest fixation occurred in sapwood at 30ʹC in 460 hours (19 days) while with the same temperature in heartwood, fixation time was 1132 hours (47 days).