In production of wood composites, mostly in production of particle boards, the usage of recovered wood and wooden residues is more and more important. In recovered wood, there is possibility of contamination with different inorganic pollutants within the first life cycle. Furthermore, also freshly cut wood can be polluted because of, for example, salt on the road during the transport in winter time. It is most important to elucidate the quality of recovered wood, because it has been pre-used and most likely somehow treated with surface coatings, biocides, residues from construction or transport. These chemicals, then, can be transferred into a new product, like wooden composites, where concentration of inorganic pollutants should be limited. The maximal amount of inorganic pollutants in wood is prescribed by various ordinaces. In Slovenian market, many different sorts of wood composites from various manufacturers from different countries are present. Considering that fact, we were interested in knowing what the condition on the Slovenian market of wood composites is, regarding the pollutants. We gathered 78 different samples and analysed them with XRF for the presence of the following chemical elements: Cu, Cl, Cr, Fe, Pb, Br, Zn. The results show that bigger part of the samples collected are polluted above treshold
|
