The efficacy of wood preservatives were determined in laboratory soil-bed test. Pine and alder wood samples (10 x 10 x 10 mm) were treated with CCA (1, 2%), ACQ-1900 (2, 3%), ACQ-2200 (1, 2%), Tanalith E 3491 (2, 2,8%), Wolmanit CX-8 (1, 2%). The leached and unleached samples were exposed 76 days at Simlångsdalen soil and determined mass loss. The results of this study showed that mass losses of samples treated with preservatives were very low and ranged from 0,5 to 5%. However, mass losses of control samples for alder and pine were 17% and 26%, respectively.

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