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Redistribucija bakra v impregniranem lesu zaradi delovanja gliv razkrojevalk = Redistribution of copper in impregnated wood after fungal exposureHumar, Miha ; Pohleven, Franc ; Petrič, Marko, 1962-Največji razmah je kemična zaščita lesa dosegla po drugi svetovni vojni. V ta namen so se poleg kreozotnega olja največ uporabljale raztopine Cu, Cr in As soli. Trajnost zaščitenega lesa se s ... kvalitetno zaščito podaljša tudi na 50 let. V zadnjem času pa se postavlja vprašanje, kaj storiti z odsluženim zaščitenim lesom, ko ga umaknemo iz uporabe. Sprejemljiva rešitev je razstrupljevanje odpadnega zaščitenega lesa z izolati gliv, ki so odporni na baker. Preučevali smo mehanizem glivne tolerance na smrekovih vzorcih impregniranih z vodno raztopino bakrovega(II) sulfata ali z vodno raztopino bakrovega(II) oktanoata z etanolaminom (cCu = 0,75 %). Po 16 tednih izpostavitve lesnim glivam smo s presevnim elektronskim mikroskopom z rentgensko mikroanalizo opazovali mikrodistribucijo bakra v olesenelih celičnih stenah in jo primerjali z mikrodistribucijo bakra pri nerazkrojenih impregniranih vzorcih. Pri vzorcih, impregniranih s Cu(II) sulfatom in izpostavljenih na baker odpornemu izolatu glive A. vaillantii, smo opazili močno redistribucijo bakra iz olesenelih celičnih sten tako v celične lumne kot tudi na površino vzorcev in v micelij. Ob tem je prišlo tudi do nastanka netopnega bakrovega oksalata. V kolikor je bil les impregniran s pripravkom, ki je poleg Cu(II) vseboval tudi etanolamin, bakrov oksalat pri okužbi z glivo A. vaillantii ni nastal. Prišlo pa je do difuzije bakra v predele z nižjo koncentracijo. Podoben pojav difuzije bakra smo opazili tudi pri vzorcih,impregniranih z bakrovim(II) sulfatom ali z bakrovim(II) oktanoatom z etanolaminom, izpostavljenim na baker netolerantnim vrstam gliv T. versicolor in G. trabeum.Source: Zbornik referatov s posvetovanja. D. 1-2 (Str. 657-662)Type of material - conference contributionPublish date - 2002Language - slovenianCOBISS.SI-ID - 913289
Author
Humar, Miha |
Pohleven, Franc |
Petrič, Marko, 1962-
Topics
zaščita lesa |
baker |
glive razkrojevalke |
mikrodistribucija |
odpadni les |
remediacija
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Humar, Miha | 19106 |
Pohleven, Franc | 05248 |
Petrič, Marko, 1962- | 00395 |
Source: Personal bibliographies
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