LEACHING AND DECAY RESISTANCE OF ALDER AND PINE WOOD TREATED WITH COPPER BASED WOOD PRESERVATIVES

Ali Temiz, Gry Alfredsen, Umit C. Yildiz, Engin D. Gezer, Gaye Kose, Selcuk Akbas, Sibel Yildiz

Abstract


The objective of this study was to determine the leaching and decay resistance of Alder (Alnus glutinosasubsp. barbata) and Scots pine (Pinus sylvestris) wood samples treated with copper based preservatives.Samples were treated with CCA, ACQ, Tanalith E and Wolmanit with different concentrations. Scotspine samples were exposed the mini-block test against brown rot fungi (Poria placenta) and Coniophoraputeana while alder wood samples were tested against brown rot fungi (Coniophora puteana) and whiterot fungi (Coriolus versicolor). Regarding to leaching test, treated samples were impregnated with 300ml of distilled water and after 6, 24, 48 and thereafter at 48-hour intervals, the leachate was removed andreplaced with fresh distilled water according to AWPA E11. Samples of each leachate were collected andretained for copper analysis. Amount of copper released from treated wood during the leaching test waschemically analyzed with Atomic Absorption spectroscopy. Perchloric acid procedure for the digestionof wood was used according to AWPA A7-97. The amount of copper component (Qd), the cumulativequantities leached (Qc) and the average daily fluxes (FLUX) were calculated. Results shows that CCAtreated samples release less copper compared to other copper based preservatives used in this study.Highest mass losses were obtained from the leached samples treated with 1% of ACQ-2200 againstdecay fungi.

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