diplomsko delo (visokošolski strokovni študij)
Jure Atelšek (Author), Franc Pohleven (Reviewer), Miha Humar (Mentor)

Abstract

Pripravki na osnovi bakra so se izkazali kot dobri fungicidi, žal pa se v les slabo vežejo in se zato iz njega močno izpirajo. Kromove spojine izboljšajo fiksacijo bakra, vendar je njihova uporaba, zaradi rakotvornosti, prepovedana. Ena od alternativ kromu, ki ustrezajo sodobnim okoljskim standardom, je kombinacija etanolamina in oktanojske kisline. Za baker-etanolaminske pripravke je znano, da se dobro vežejo v les: ne vemo pa še koliko zaščitnega pripravka moramo vnesti, da dosežemo minimalno učinkovitost. Zato smo pripravili zaščitni pripravek na osnovi bakra, etanolamina, oktanojske kisline, kvartarne amonijeve spojine in bora pri 3 različnih koncentracijah (cCu= 1, 0,75 in 0,5 %). S tem pripravkom smo vakuumsko impregnirali vzorce, jih 4 tedne kondicionirali in nato polovico izpirali, kot to predvideva standard SIST EN 84. Zatem smo izprane in neizprane za 16 tednov izpostavili delovanju gliv razkrojevalk (kletni gobi -Coniophora puteana, beli hišni gobi - Antrodia vaillantii, sivi hišni gobi - Serpula lacrymans, pisani ploskocevki - Trametes versicolor, navadni tramovki - Gloeophyllum trabeum) v skladu s standardom SIST EN 113. Po izpostavitvi smo jih očistili in gravimetrično določili izgubo mase. Rezultati testa so pokazali, da je zaščitni pripravek učinkovit pri vseh 3 koncentracijah, tako na izpranih kot tudi neizpranih vzorcih. Novo razvit pripravek je uspešno zaščitil smrekovino tudi pred sevi na baker tolerantne bele hišne gobe.

Keywords

zaščita lesa;bakrovi pripravki;etanolamin;glive razkrojevalke lesa;minimalna učinkovita koncentracija;

Data

Language: Slovenian
Year of publishing:
Source: Ljubljana
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [J. Atelšek]
UDC: 630*841
COBISS: 1492361 Link will open in a new window
Views: 1118
Downloads: 333
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: English
Secondary title: Determination of minimal effective concentracion of copper ethanolamine based preservative for protection of wood against decay
Secondary abstract: Copper based wood preservative solutions are excellent fungicides, but unfortunately they do not fix well in wood: therefore, they are prone to leaching. Chromium compounds enable copper fixation, but their use is not desired due to potential chromium carcinogenic effect. One of the environmentally acceptable alternatives for copper fixation is combination of ethanolamine and octanoic acid. Wood preservatives on the basis of copper, ethanolamine and octanoic acid are sufficiently fixed in wood, but there are no data available on minimum effective concentration. Therefore, wood preservative on the basis of copper(II) sulphate, ethanolamine, octanoic acid, boron and quaternary ammonium compound of 3 different concentrations were used (cCu= 1, 0.75 in 0.5 %) for vacuum impregnation of Norway spruce specimens (Picea abies). Impregnated specimens were conditioned for 4 weeks, followed by leaching of half of the specimens, according to the EN 84 procedure. Afterward specimens were exposed to wood decay fungi (Coniophora puteana, Antrodia vaillantii, Serpula lacrymans, Trametes versicolor and Gloeophyllum trabeum) according to the EN 113 procedure. After 16 weeks of exposure, their mass losses were determined gravimetrically. Results show that the tested wood preservative solution exhibited sufficient protection against the tested wood decay fungi at leached and unleached specimens at all 3 concentrations. Spruce impregnated with the developed copper-ethanolamine wood preservative was protected even against copper tolerant fungal strains of Antrodia vaillantii.
Secondary keywords: wood preservation;copper based wood preservatives;ethanolamine;wood decay fungi;minimal inhibitory concentration;
Type (COBISS): Undergraduate thesis
Thesis comment: Diplomsko delo, Univ. v Ljubljani, Biotehniška fakulteta, Oddelek za lesarstvo
Pages: VII, 37 f.
Keywords (UDC): applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba;
ID: 21086