Surface accumulation of copper on CCA-impregnated Pinus patula stakes during marine preservative trials in the southern hemisphere
G D Shelver, C D McQuaid, M Tarin, A A W Baecker
Pinus patula stakes treated with CCA to target retentions of 30 kg/m³ salts were exposed to sea water in marine and estuarine ecosystems off the coast of Southern Africa for two years. Samples were then analysed for copper and arsenic. Analysis of samples from the marine ecosystem showed (IRG/WP/4167) that arsenic was longitudinally and transversely leached from the wood, whereas the copper was redistributed to the surfaces of the wood. Recent analyses have now confirmed that similar trends of copper mobility occurred in Pinus patula exposed to the estuarine ecosystem, i.e., copper levels within the wood decreased while the levels of the exterior zones of the wood increased correspondingly.