Effect of the addition of ammonia in the retention and leaching of copper-amine-treated southern pine cubes

Southern pine cubes were pressure treated with an aqueous formulation containing various amounts of copper monoethanolamine (Cu-MEA) and ammonia. The copper concentrations in the treating solutions ranged from 0.25 to 1.0 percent by weight and the ammonia content from 0.5 to 1 percent by weight. A laboratory leaching test was performed on treated cubes to determine the influence of copper retentions and addition of up to 1 percent ammonia on the retention and leaching of copper in the treated cubes. The copper retention and the amount of copper leached in treated cubes increased with the copper concentration in treated solution. About 6 to 8 percent initial copper was leached from cubes containing 1.9 ? 0.3 kg/m3 Cu, 14 to 16 percent from cubes with 2.8 ? 0.2 kg/m3 retention, and 15 to 19 percent from specimens with 5.6 ? 0.5 kg/m3. The addition of up to 1 percent ammonia in treated solution did not significantly influence the copper retention or the amount of copper leached.

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