Interaction of copper-amine complexes with wood: Influence of copper source, amine ligands and amine to copper molar ratio on copper retention and leaching

IRG/WP 99-30203

Jun Zhang, D P Kamdem

The absorption and leachability of copper in copper amine (Cu-EA) treated wood are influenced by the formulation and the composition of copper amine treating solutions. The sources of copper used, Cu(OH)2, CuCO3, CuSO4 and Cu(NO3)2, in the copper amine complex formulation affect the leachability of copper. Data show that copper amine from CuSO4 and Cu(NO3)2 treated wood has less copper loss during laboratory water leaching than those from Cu(OH)2 and CuCO3 treated wood. Increasing amine to copper molar ratio increases the copper retention by wood, but reduces the leaching resistance of copper. The nature of amine ligands, such as monoethanolamine (primary amine), 2-methylamino-ethanol (secondary amine) and N, N-dimethyl-ethanolamine (tertiary amine), has some effect on copper retention and copper leaching. As the molecular weight of amine ligands increases, copper loss during leaching decreases.


Keywords: COPPER AMINE; SOUTHERN PINE; INTERACTION; RETENTION; LEACHING; LEACHABILITY

Conference: 99-06-06/11 Rosenheim, Germany


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