Improving antifungal properties of wood with copper, zinc and cerium containing chemicals

Abstract

Wood being an organic material can be degraded and destroyed by wood-destroying organisms. For this purpose, many wood preservatives have been developed from the past to the present, and are still being developed. In this study, scots pine samples were impregnated with zinc chloride (ZnCl2), nano cerium oxide (CeO2), nano zinc oxide (ZnO) and copper II sulphate (CuSO4) at a concentration level of 0.25%, 0.5, 1, 1.5 and 2.5. Decay resistance against brown (Coniophora puteana) and white (Trametes versicolor) rot fungi attacks has been determined. The antifungal effectiveness of the preservatives was determined for both leached and unleached samples. Furthermore, toxicity in leachate was determined by measuring the mycelium growth of the same fungi species in the petri dishes. Decay test results showed that ZnCl2 was effective in inhibiting both fungi growth on wood samples. In addition, ZnCl2 was found to be the most leach resistant and effective chemical in preventing both decay fungi among the other chemicals. A minimum concentration level of 1.5% was needed for efficient decay resistance for both CeO2 and CuSO4. 1% concentration of ZnO was found to be effective in suppressing the tested fungi attacks in unleached samples, while, all concentration levels in leached samples were not found to be effective to prevent T. versicolor attack. Mycelium growth of the both fungi on leachates was similar to the growth level on references after 2 weeks.

Keywords

• Impregnation
• Antifungal
• Nano metal oxides
• Zinc
• Copper

Bakır, çinko ve seryum içeren kimyasal maddeler ile odunun antifungal özelliklerinin iyileştirilmesi

Abstract

Organik bir malzeme olan odun, odun tahripçisi organizmalar tarafından bozundurulmakta ve tahrip edilebilmektedir. Bu amaçla geçmişten günümüze kadar birçok emprenye maddesi geliştirilmiş ve halen de geliştirilmeye devam etmektedir. Bu çalışmada, sarıçam örnekleri %0,25, 0,5, 1, 1,5 ve 2,5 konsantrasyon seviyesinde çinko klorür (ZnCl2), nano seryum oksit (CeO2), nano çinko oksit (ZnO) ve bakır II sülfat (CuSO4) ile emprenye edilerek, örneklerin esmer (Coniophora puteana) ve beyaz (Trametes versicolor) çürüklük mantar saldırılarına karşı dayanımı belirlenmiştir. Emprenye maddelerinin etkinliği, yıkanmış ve yıkanmamış örneklerde tespit edilmiştir. Ayrıca, yıkanma sularında zehirlilik tespiti, çalışmada kullanılan mantar türlerinin misel gelişimi ile takip edilmiştir. Sonuçlar, ZnCl2’ün her iki mantarın saldırısını önlemede etkili olduğunu göstermiştir. Ayrıca ZnCl2’ün yıkanmaya karşı dayanıklı olduğu ve test edilen kimyasal maddeler arasında en etkili sonucun ZnCl2 ile alındığı tespit edilmiştir. Biyolojik dayanım için CeO2 ve CuSO4’ün minimum %1,5’luk konsantrasyonlarının gerekli olduğu belirlenmiştir. Yıkanmamış örneklerde ZnO’in %1 konsantrasyon seviyesi her iki mantara karşı dayanım gösterirken, yıkanmış örneklerin tüm grupları T. versicolor’a karşı bir dayanım göstermemiştir. Yıkanma sularının zehirlilik testinde, 2 hafta sonunda misel gelişimi, kontrol örneklerinde görülen büyüme seviyesine benzer bulunmuştur. 

Keywords

• Emprenye
• Antifungal
• Nano metal oksitler
• Çinko
• Bakır

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