Studies on the Interaction between Birch Veneer and Compounds with Biocide Potential Action

This paper discusses the results of study concerning the interaction between the birch veneer and some compounds with biocide potential action are presented. With this end in view the samples of veneer were immersed in solutions with a concentration of 5% of the following products: unmodified straw lignin or modified through hydroxymethylation, furan resin and tannins dissolved in 0.1 N ammonia solution. To make a comparison, the same combined treatments were applied, using ammonia solutions of some copper compounds (CuCl2 and copper-ammonia solution) and the above mentioned organic compounds to obtain in situ their complexes. The stability of the treatments was followed through successive elution with distillated water of the impregnated samples. The toxicity of the extracts was followed by germination tests of tomato seeds. The obtained results highlighted that the stability of the treatments are in agreement with the nature’s products, the functionality and the complex forming degree, that determine their interaction with the veneer.