INTERACTION OF COPPER-AMINE WITH SOUTHERN PINE: RETENTION AND MIGRATION

The retention and leachability of copper in copper-amine (Cu-EA)-treated southern pine (SP) are influenced by the formulation and the composition of copper-amine treating solutions.The sources of copper used, Cu(OH),, CuCO,, CuSO,, and Cu(NO,),, in the copper-amine complex formulation affect the leachability of copper.Data show that copper-amine from CuS0,-and Cu(NO,),-treated wood has less copper loss during laboratory water leaching than that from Cu(OH),-and CuC0,-treated wood.Increasing the amine-to-copper molar ratio increases the copper retention by wood, but reduces the leach 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.