Performance of copper-ethanolamine impregnated Scots pine wood during exposure to soft rot fungi and bacteria

Baker-etanolaminski pripravki so najpomembnejši biocidni proizvodi za zaščito lesa v stiku z zemljo (4. razred izpostavitve). V tem razredu lesne izdelke ogrožajo bakterije, kakor tudi različne skupine gliv razkrojevalk. V močno vlažnih tleh so še posebej pogoste bakterije in glive, ki povzročajo mehko trohnobo. Dosedanje raziskave odpornosti impregniranega lesa so bile večinoma opravljene z glivami prostotrosnicami v aerobnih pogojih, v literaturi pa ni zaslediti podatkov o odpornosti baker-etanolaminskih pripravkov na glive mehke trohnobe in bakterije. Določevali smo odpornost impregniranega lesa z različnimi koncentracijami aktivnih učinkovin na glive mehke trohnobe in bakterije ter določevali izpiranje bakrovih učinkovin iz lesa. Uporabili smo 3 različne koncentracije baker-etanolaminskih pripravkov in z njimi impregnirali vzorce lesa. Vzorce smo kondicionirali in jih postavili v 4. razred izpostavitve (v stiku z zemljo). Uporabili smo 3 tipe zemlje in sicer: gozdno, s polja in kompost. Rezultate smo prikazali v medsebojni odvisnosti med tipom zemlje in koncentracijo baker-etanolaminskega pripravka3. spremenljivka je bil čas izpostavitve vzorcev. Navkljub znatnem izpiranju bakra so tretirani vzorci pokazali dobro odpornost. Rezultati kažejo dobro korelacijo med mehanskimi lastnostmi in izgubo mase vzorcev, ne glede na uporabljeno koncentracijo zaščitnega pripravka.Copper-ethanolamine based wood preservatives are most important solutions for protecting wood in soil applications. Wood in the soil is exposed to bacteria and other organisms which decay wood. In soil with high moisture, the most common are soft rot fungi. So far, no facts of exposure of copper-ethanolamine preserved wood against soft rot fungi are reported. To simulate these conditions in the laboratory, Scots pine specimens impregnated with 3 different concentrations of copper-ethanolamine preservatives were exposed to 3 different soil from 12 to 32 weeks. After the exposure, samples were isolated and their mass loss, bending strength and modules of elasticity determined. The remaining copper in the samples were also determined. Results showed that in spite of significant copper leaching, the tested copper-ethanolamine treated samples exhibited good performance in ground applications. Results show a good correlation between mechanical properties and mass loss determined, regardless of the chemical treatment applied