20.500.12556/DiRROS-7632 Vpliv emulzije PVA na izpiranje bora in bakra iz lesa ter na učinkovitost delovanja proti glivam razkrojevalkam lesa Influence of PVA emulsion on leaching of boron and copper from wood and efficacy on wood decay fungi Borove spojine učinkovito delujejo proti glivam razkrojevalkam, a se na žalost v vlažnem okolju izpirajo iz lesa. Z namenom doseči čim boljšo vezavo v les, smo borovo kislino, boraks in bakrov(II) sulfat pentahidrat kombinirali s polivinil acetatno (PVA) emulzijo. Z izbranimi pripravki smo impregnirali vzorce smreke (Picea abies) in jih izpostavili trem različnim glivam razkrojevalkam lesa (Antrodia vaillantii, Gloeophyllum trabeum in Trametes versicolor) po postopku mini blok. Del impregniranih vzorcev smo izpirali v skladu s standardom SIST EN 1250-2. Ugotovili smo, da dodatek PVA-emulzije rahlo izboljša vezavo borovih in bakrovih ionov v les. Smrekovina, impregnirana s pripravki z najnižjo koncentracijo borovih učinkovin (cB = 0,1 %), je odporna na vse testne glive, medtem ko je les, zaščiten z raztopinami na osnovi bakra, dobro zaščiten pred glivama Gloeophyllum trabeum in Trametes versicolor in neustrezno zaščiten pred glivo Antrodia vaillantii. Dodatek emulzije PVA že sam po sebi nekoliko zavre delovanje gliv in izboljša delovanje bakrovih in borovih učinkovin. Boron compounds are very effective fungicides, but they leach from wood in wet environments, unfortunately. In order to improve boron fixation, boric acid, borax and copper(II) sulphate were combined with polyvinyl acetate emulsion (PVA). Selected preservative solutions were chosen for impregnation of Norway spruce wood specimens (Picea abies). Wood blocks were exposed to three wood decay fungi Antrodia vaillantii, Gloeophyllum trabeum and Trametes versicolor according to the mini block procedure. Part of impregnated specimens was leached according to the EN 1250-2 procedure. The results showed that addition of PVA emulsion slightly improves copper and boron fixation. Spruce wood impregnated with the lowest concentration of boron based solutions (cB = 0.1%) was found resistant against tested fungi. In contrast, wood blocks impregnated with copper were sufficiently protected against G. trabeum and T. versicolor but not against A. vaillantii. Furthermore, PVA itself has a negative impact on fungal growth, and it improves performance of boron and copper based aqueous solutions. zaščita lesa baker bor PVA emulzija smreka vezava wood preservation boron copper fixation Norway spruce PVA emulsion true false true Slovenski jezik Angleški jezik Neznano 2017-07-12 09:18:40 2017-07-12 09:18:40 2022-08-12 14:08:09 0000-00-00 00:00:00 2007 0 0 str. 27-32 Vol. 84 2007 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630 0351-3114 URN:NBN:SI:doc-4O3PKPF5 1609097 6206978 RAZ_Lesar_Bostjan_i2007.pdf RAZ_Lesar_Bostjan_i2007.pdf 1 E87870D597F4489F1E7D2AE54B606D84 9d985a9d7aa221f737efeca853c225e286e4437a439a3769547cd92ce3d0cdd9 1ecdfd8a-17b5-11ed-b6b8-001a4af901a5 20.500.12556/dirros/a0064c01-d58b-4b8a-9231-9eedad53a88e https://dirros.openscience.si/Dokument.php?lang=slv&id=9498 Gozdarski inštitut Slovenije Acta Silvae et Ligni 0 0 0