20.500.12556/RUL-158693 Izpiranje baker-etanolaminskih pripravkov iz venčasto poroznih lesnih vrst magistrsko delo Leaching of copper-ethanolamine based preservatives from ring porous hardwoods M. Sc. thesis Les v 3. in 4. razredu izpostavitve ogrožajo številni abiotski in biotski dejavniki razgradnje. V naravi so ti procesi zaželeni in nujno potrebni, ko pa les uporabljamo v gospodarske namene, so procesi razgradnje nezaželeni in jih želimo čimbolj upočasniti. Ena od rešitev je impregnacija z baker-etanolaminskimi pripravki. Iz venčasto poroznih lesnih vrst smo izdelali vzorce in jih impregnirali z 2 koncentracijama zaščitnega pripravka Silvanolin. Vzorce smo izpirali v skladu s standardom CEN/TS 15119-2:2008 in CEN/TS 15119-1:2008. Prvi je namenjen za izpiranje učinkovin iz lesa, ki je izpostavljen v 4. in 5. razredu uporabe; drugi pa za določanje učinkovin iz zaščitenega lesa, ki je izpostavljen v 3. razredu uporabe. Vzorcem smo spremljali vlažnost in vrednost pH izpirkov. S pomočjo spektroskopije XRF smo določili koncentracijo Cu v izpirkih ter izračunali delež izpranega Cu iz lesa. Vlažnost vzorcev je pri izpiranju v skladu z obema standardoma naraščala, le da smo pri izpiranju v skladu s standardom CEN/TS 15199-2:2008 opazili dosti višje vlažnosti vzorcev kot pri izpiranju v skladu s standardom CEN/TS 15199-1:2008. Pri lesnih vrstah, ki vsebujejo veliko ekstraktivov, smo opazili nizke pH vrednosti izpirkov. Rezultati kažejo na to, da koncentracija zaščitnega pripravka ni imela izrazitega vpliva na prodiranje v les. Zelo slabo prodiranje smo opazili pri vzorcih iz lesa robinije; pri hrastovih in kostanjevih je bilo prodiranje v les dobro, vendar se je zaradi omejenega števila reakcijskih mest v lesu veliko zaščitnega pripravka tudi izpralo. Ugotovili smo tudi, da je bilo izpiranje v skladu s standardom CEN/TS 15119-2:2008 veliko bolj intenzivno kot izpiranje v skladu s standardom CEN/TS 15119-1:2008. The wood in 3rd and 4th use class is endangered by numerous abiotic and biotic degradation factors. These processes are essential for natural carbon cycle, but when the wood is used for economic purposes, these processes of decomposition are undesired, thus we would like to slow them down as much as possible. One of the solutions for this is impregnation with copper-ethanolamine preservatives. There were quite some studies performed on conifer wood, but there are no reports for the hardwoods, particularly ring porous ones. Therefore, we have made samples from ring porous hardwoods, impregnated them with 2 concentrations of preservative solution Silvanolin. The samples were leached out according to the CEN/TS 15119-2:2008 and CEN/TS 15119-1:2008 standards. The first one is designed for leaching of wood in use class 4 and 5, the second for leaching of active ingredients from wood in use class 3 applications. The moisture content of wood and pH value of leachates were determined. Spectroscopy XRF was applied in order to determine the Cu concentration in leachates. During the leaching, the moisture content increased much higher in the samples leached according to use class 4 and 5 procedure than those leached in class 3 procedure. Additionally lower pH values of leachates were determined, due to extractives. The results show that the concentration of active ingredients did not have a distinctive influence on penetration. The lowest penetration was determined at samples made of robinia. At samples made of oak and sweet chestnut the penetration was slightly better, but due to the limited fixation sites in wood, significant percentage of retained active ingredients were leached from wood. The leaching according to the standard CEN/TS 15119-2:2008 was much more intensive then that according to the standard CEN/TS 15119-1:2008. zaščita lesa baker-etanolaminski pripravki navzem venčasto porozne lesne vrste izpiranje bakra wood preservation copper-ethanolamine preservatives impregnability ring porous hardwoods copper leaching true false false T. Korošec Slovenski jezik Angleški jezik Magistrsko delo/naloga 2024-06-19 11:50:38 2024-06-19 11:50:41 2024-07-03 03:40:12 0000-00-00 00:00:00 2015 0 Ljubljana 2015 Ljubljana X, 61 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*841 2387593 MAG_Korosec_Tjasa_2015.pdf MAG_Korosec_Tjasa_2015.pdf 1 73F4A0D7BC9A02BB9E6FD75958B98DFC d8ab00f43a9f11217d64cb8ae2753b7e3e92c8d1c0c99cb8cd20c6535a81bf75 640ea55e-2e21-11ef-aa1b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=186405 Biotehniška fakulteta 0 0 0