Small scale burning experiments are described involving copper-chrome-arsenic treated wood. Approximately 20 per cent of the arsenic was volatilised when the wood was burned in air but 60 per cent when burned in an oxygen-enriched atmosphere, this increase is attributed to an increase in combustion temperature. Although a small increase in arsenic evolution was found with an increased concentration of CCA in the wood this increase is not considered sufficient to be of any practical importance. The concentration of water-soluble arsenic and chromium in the wood-ash was greater when the experiment was conducted with oxygen-enriched air.

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