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Vpliv pufrov na odpornost z bakrovimi pripravki zaščitenega lesa pred trohnenjem : diplomsko delo - univerzitetni študij
Videmšek, Jerneja (Author), Humar, Miha (Mentor) More about this mentor... This link opens in a new window, Pohleven, Franc (Reviewer)

URLURL - Presentation file, Visit http://www.digitalna-knjiznica.bf.uni-lj.si/dn_videmsek_jerneja.pdf This link opens in a new window

Abstract
Trajnost lesa je odvisna od njegove naravne odpornosti, konstrukcijskih rešitev vgradnje in ne nazadnje uporabljene kemične zaščite. Za zaščito se še posebej pogosto uporabljajo bakrovi pripravki. V praksi se je izkazalo, da je učinkovitost teh pripravkov včasih nezadostna. Zato smo želeli ugotoviti ali lahko s spremembo vrednosti pH impregniranega lesa, upočasnimo trohnenje lesa, zaščitenega z bakrovimi pripravki. Poizkus smo izvedli na beljavi smrekovih vzorcev z nestandardno mini blok metodo. Uporabili smo glive: Antrodia vaillantii, Gloeophyllum trabeum, Hypoxylon fragiforme, Serpula lacrymans. Vzorce smo najprej vakuumsko impregnirali z 2 različnima raztopinama (CC in CuE) različnih koncentracij (cCu = 0,1 % in cCu = 0,25 %) ter jih nato prepojili s pufri: pH 5, pH 7, pH 9 in H2O. Rezultati so pokazali, da lahko učinkovito upočasnimo razkrojne procese, ki jih povzroča na baker tolerantna gliva Antrodia vaillantii, z višanjem vrednosti pH, saj je v bazičnem okolju bistveno manj razkraja kot v kislem. Tudi glivama Hypoxylon fragiforme in Serpula lacrymans ne ustrezajo bazične pH vrednosti lesa. Po drugi strani pa visoka pH vrednost lesa ustreza glivi Gloeophyllum trabeum, ki močno razkraja z bakrovimi pripravki zaščiteni les, naknadno prepojen z bazičnimi pufri.

Language:Slovenian
Keywords:zaščita lesa, lesne glive, baker, bakrovi pripravki, vrednost pH, razkroj
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2009
Publisher:[J. Videmšek]
Number of pages:X, 48 f.
Place:Ljubljana
UDC:630*841
COBISS.SI-ID:1754505 Link is opened in a new window
Views:533
Downloads:202
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Secondary language

Language:English
Abstract:
Durability of wood depends on natural durability, design, and applied chemical preservation. One of the most important biocides used in commercial wood preservatives are copper compounds. Recent experiences showed that despite of the widely used copper compounds their efficacy was not sufficient. The purpose of this work is to elucidate, if the pH of the wood improves fungicidal properties of the copper treated wood. The experiment was performed on spruce softwood specimens, exposed to wood decay fungi according to the mini block procedure. In the experiment the following fungi were utilised: Antrodia vaillantii, Gloeophyllum trabeum, Hypoxylon fragiforme, Serpula lacrymans. Specimens were vacuum impregnated with 2 different copper based solutions (CC and CuE) of 2 different concentrations (cCu = 0.1 % and cCu = 0.25 %). Impregnated specimens were afterwards soaked with 3 aqueous buffer solutions: pH 5, pH 7, pH 9 and H2O. The results show that higher (basic) pH values significantly increase efficacy of the copper based preservatives against copper tolerant fungi Antrodia vaillantii. Basic pH values are not favoured by Hypoxylon fragiforme and Serpula lacrymans, as well. In contrary, wood decay fungus Gloeophyllum trabeum decays considerably more alkaline copper treated wood compared to copper treated wood soaked with water only.

Keywords:wood preservation, wood fungi, copper, copper based preparation, pH value, decay

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