Synergistic wood preservatives: terrestrial microcosms (TMCs) and field exposure efficacy studies of the synergistic copper:pyrithione mixture.

摘要

On the basis of short-term laboratory tests using various wood decay fungi, it was previously found that the mixture of copper (II) and sodium pyrithione is highly synergistic. In this study the efficacy of this mixture was studied in protecting wood using terrestrial microcosms (TMCs) with three different Swedish soils, and field stake (ground contact) tests in two different locations in Mississippi. After 12 months of exposure in TMCs, the copper:pyrithione mixture was found to be more effectivethan either component alone, with only slight degradation due to tunnelling bacteria in a compost soil TMC. The field stake test, after 6 years of exposure, showed that a mixture of 0.31 lb/ft3 or greater copper (as CuO) and 0.063 lb/ft3 or greater pyrithione (as the sodium salt) was approximately as effective as about 0.35 lb/ft3 CCA in preventing fungal and termite degradation.