Distribution and permanency of DDAC in southern pine sapwood treated by the full-cell process

The amount of didecyldimethylammonium chloride (DDAC) fixed in the springwood and summerwood components of southern pine sapwood was determined by analyzing the treated wood before and after exposure to liquid water, wet soil, and ultraviolet (UV) light. After springwood and summerwood were exposed to wet soil, the springwood retained approximately 1.5 percent weight/weight DDAC, while the summerwood retained approximately 1.0 percent weight/weight DDAC. Although the samples had been preleached in water, a considerable amount of leaching occurred after exposure to wet soil. The DDAC retention levels after soil exposure were in the range of toxic threshold values previously established in soil block tests. This low retention level may explain the poor ground contact performance of wood treated with this preservative. After the treated wood was exposed to UV light, only slight reductions in the springwood and summerwood DDAC retention levels were observed.

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