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To investigate the chemical adsorption capacity of copper-monoethanolamine (Cu-Mea) components on wood, the Na +  cation exchange capacity (CEC) of red pine ( Pinus resinosa  Ait.) was determined and compared with the adsorption capacity of free Mea, Cu 2+  and Cu-Mea complexes. Red pine showed higher CEC as pH increased. Free Mea adsorption as a function of pH followed the Na adsorption curve except at pH over 9, when it exceeded the CEC. Below pH 5, where Cu-Mea complexes do not form, divalent Cu 2+  was adsorbed as if it were monovalent. Cu-Mea adsorbed up to the CEC at pH 9.0–9.5 apparently as [CuMea] + , whereas the complex in solution is predominantly of the form [Cu(Mea) 2 ] + . FTIR analysis showed that the same sites of wood are related to Mea, Na, and Cu adsorption.

Copper monoethanolamine adsorption in wood and its relation with cation exchange capacity (CEC)