692<strong>wood</strong> as well (Humar et al. 2003).The shapes <str<strong>on</strong>g>of</str<strong>on</strong>g> the EPR spectra <str<strong>on</strong>g>of</str<strong>on</strong>g> impregnated <strong>wood</strong>, treated with various<strong>copper</strong> based formulati<strong>on</strong>s, are more similar than the preservative soluti<strong>on</strong>s(Table 2). However, the parameters <str<strong>on</strong>g>of</str<strong>on</strong>g> EPR spectra <str<strong>on</strong>g>of</str<strong>on</strong>g> impregnated <strong>wood</strong> differaccord<strong>in</strong>g to the am<strong>in</strong>e used. For specimens impregnated with Cu/ethanolam<strong>in</strong>esoluti<strong>on</strong>s an average EPR value g^ <str<strong>on</strong>g>of</str<strong>on</strong>g> 2.061 was determ<strong>in</strong>ed, for specimenstreated with Cu/diethanolam<strong>in</strong>e a value <str<strong>on</strong>g>of</str<strong>on</strong>g> 2.057 and for specimens preservedwith Cu/triethanolam<strong>in</strong>e a g^ value <str<strong>on</strong>g>of</str<strong>on</strong>g> 2.063 was determ<strong>in</strong>ed. These parametersc<strong>on</strong>firm that <strong>in</strong> <strong>wood</strong> impregnated with various am<strong>in</strong>es there are differentcomplexes formed <strong>in</strong> <strong>wood</strong> (Fig. 1c). Additi<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>carboxylic</str<strong>on</strong>g> <str<strong>on</strong>g>acids</str<strong>on</strong>g> to <strong>copper</strong>/am<strong>in</strong>e soluti<strong>on</strong>s does not <strong>in</strong>fluence the EPR parameters <str<strong>on</strong>g>of</str<strong>on</strong>g> impregnated <strong>wood</strong>,with the excepti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> decanoic <str<strong>on</strong>g>acids</str<strong>on</strong>g>, which <strong>in</strong> comb<strong>in</strong>ati<strong>on</strong> with ethanolam<strong>in</strong>eand diethanolam<strong>in</strong>e exhibited lower g II values and higher A II <strong>on</strong>es (Table 2).Accord<strong>in</strong>g to the literature data <str<strong>on</strong>g>of</str<strong>on</strong>g> Zhang and Kamdem (2000) we presume that<strong>wood</strong> comp<strong>on</strong>ents <strong>in</strong>teract with <strong>copper</strong>/am<strong>in</strong>e complex perpendicularly throughCu–O <strong>in</strong>teracti<strong>on</strong> with a m<strong>in</strong>imum to negligible displacement <str<strong>on</strong>g>of</str<strong>on</strong>g> the am<strong>in</strong>eligands. It seems that it is possible to replace the <strong>copper</strong>–oxygen bound <strong>in</strong> am<strong>in</strong>esoluti<strong>on</strong> with similar <strong>copper</strong>–oxygen bound to <strong>wood</strong> comp<strong>on</strong>ents.C<strong>on</strong>clusi<strong>on</strong>sAdditi<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>carboxylic</str<strong>on</strong>g> <str<strong>on</strong>g>acids</str<strong>on</strong>g> to aqueous soluti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> <strong>copper</strong>/am<strong>in</strong>e significantlydecreases the leach<strong>in</strong>g <str<strong>on</strong>g>of</str<strong>on</strong>g> <strong>copper</strong> from impregnated Norway spruce <strong>wood</strong>.Octanoic acid was found an effective agent to improve <strong>copper</strong> fixati<strong>on</strong>. Thelowest leach<strong>in</strong>g rates were observed <strong>in</strong> specimens impregnated with a comb<strong>in</strong>ati<strong>on</strong><str<strong>on</strong>g>of</str<strong>on</strong>g> <strong>copper</strong>, ethanolam<strong>in</strong>e and octanoic acid.Acknowledgements The authors would like to thank the Slovenian M<strong>in</strong>istry <str<strong>on</strong>g>of</str<strong>on</strong>g> higher educati<strong>on</strong>,science and technology for f<strong>in</strong>ancial support with<strong>in</strong> the frame <str<strong>on</strong>g>of</str<strong>on</strong>g> the program L4-6209-0481-04/4.01.ReferencesAbragam A, Bleaney B (1970) Electr<strong>on</strong> paramagnetic res<strong>on</strong>ance <str<strong>on</strong>g>of</str<strong>on</strong>g> transiti<strong>on</strong> i<strong>on</strong>s. 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