Effect of surfactants on penetration and absorption of chromated copper arsenate in Douglas-fir

Five commercial cationic, anionic, and nonionic surfactants were tested for their ability to improve treatment of kiln- and air-dried Douglas-fir heartwood by chromated copper arsenate (CCA). Although some of the surfactants slightly improved the degree of CCA penetration, the effects were not consistent between kiln- and air-seasoned material. Chemical analyses revealed that only one surfactant, Aerosol? AY, was associated with higher chemical loadings than those achieved with the non-amended CCA. The results suggest that altering the surface tension of the solution with the surfactants tested did not markedly improve treatability of Douglas-fir heartwood with CCA.

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