Abstract
Wood preservative properties of a solution of ZnSO4 and MnSO4 (Zn/Mn molar ratio: 2∶1), obtained by a process for household battery recycling were studied. Its effect on the growth and enzymatic activity of wood rotting basidiomycetes (Coriolus versicolor, Phanerochaete chrysosporium, Pleurotus ostreatus, Ganoderma resinaceum, Punctularia atropurpurascens, Pycnoporus sanguineous, Inonotus sp, Gymnopilus spectabilis and Gloeophyllum trabeum) was analysed, based on measurements of initial growth rate, minimum inhibitory growth and decolourisation inhibiting concentration. The study solution inhibited mycelial growth and extracellular ligninolytic activity at concentrations between 0·5 and 2 mM Zn2+, depending on species. The above results were compared with the effect of solutions of pure sulphates. Study solution inhibited mycelial growth at a lower concentration than that of pure sulphates. Wood preservative effect of the study solution was demonstrated in tests using wood substrate (small blocks of Pinus taeda L. and Eucalyptus grandis), finding a minimum toxic value equivalent to 3% Zn2+.
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