Metal migration from chromated copper arsenate, copper azole or alkaline copper quaternary compound treated southern pine lumber was assessed at sites in Mississippi and Oregon. Metal levels tended to be consistently higher in decks exposed in Mississippi. Rainfall characteristics did differ slightly at the two sites, but the levels did not appear to be of a magnitude that might affect metal mobility. The results suggest that tests of methods for limiting preservative migration from treated wood must expose materials at multiple sites to ensure that the processes are broadly appropriate.

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