Seven North American hardwood species were treated with 2% CCA-C solution and fixed at temperatures of 21°C and 50°C and conditions of high relative humidity (95%) as described in Part 1 of this presentation. Red pine (Pinus resinosa) was included as a softwood for comparison. Adequately fixed wood blocks (99.9% chromium fixation) were exposed to leaching tests according to AWPA E11-87 test. Particularly high leaching losses were determined for red oak, red maple and beech.. In the case of red oak all three elements were leached in high quantities, while from red maple and beech higher arsenic leaching occurred. Higher leaching of arsenic was observed in those red maple blocks that fixed the fastest. Leaching losses from aspen, basswood and yellow poplar were low and comparable for both fixation temperatures. Very low leaching of arsenic from aspen and yellow poplar was observed in all series of experiments. Leaching results obtained confirmed the validity of the division of the examined hardwoods into three groups according to the CCA fixation and leaching results: fast fixing/high leaching group (beech, red oak and red maple), intermediate fixation rate and leaching amount (white birch and red pine) and slow fixing and low leaching group (aspen, yellow poplar and basswood).

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