The biostatic effect of copper on decay of fire retardant-treated mining timber
G D Shelver, E A Shelver, A A W Baecker
Blocks of Eucalyptus grandis were treated with 20kg/m³ ammonium sulphate as fire retardant and challenged with Coriolus versicolor. Replicates were soil buried. A second set of blocks was treated with retardant and copper at 6.6 kg/m³ (ie 1% w/w), and challenged similarly. After 8 weeks weight losses produced by Coriolus versicolor in untreated, retardant treated and copper supplemented blocks were 45, 25, and 0% respectively, and corresponding weight losses in soil were 27, 25 and 10%. These results, and electronmicroscopical observations, showed conclusively that Eucalyptus grandis treated with fire retardant was rapidly decayed, and that copper inhibited such decay.
Keywords: COPPER; CORIOLUS VERSICOLOR; DECAY; EUCALYPTUS GRANDIS; FIRE RETARDANTS; MINING TIMBERS; SOUTH AFRICA; WEIGHT LOSS