Leaching of CCA-C from jack pine sapwood in compost

The leaching of type C chromated copper arsenate (CCA-C) impregnated jack pine blocks exposed to composting vegetable matter was compared to leaching of blocks either soaked in distilled water, exposed to exterior weathering, or buried in soil out of doors over a 12-month period in Toronto, Ont., Canada. Copper losses were higher for blocks exposed to compost for 12 months, suggesting that organic acids produced during composting form water-soluble complexes with the copper component. Generally, losses are not great enough to cause concern about loss of efficacy or contamination of compost in this application.

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