کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4429092 | 1619809 | 2013 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Biocide leaching from CBA treated wood — A mechanistic interpretation Biocide leaching from CBA treated wood — A mechanistic interpretation](/preview/png/4429092.png)
Treated wood is frequently used for construction. However, there is a need to ensure that biocides used for the treatment are not a threat for people or environment. The paper focused on Pinus sylvestris treated with copper–boron–azole (CBA), containing tebuconazole as organic biocide and monoethanolamine (Mea).This study investigates chemical mechanisms of fixation and mobilisation involved in the leaching process of the used inorganic and organic biocides in CBA.A pH dependent leaching test was performed, followed by a set of complementary analysis methods in order to identify and quantify the species released from wood. The main findings of this study are:-Organic compounds are released from untreated and treated wood; the quantity of released total organic carbon, carboxylic and phenolic functions increasing with the pH.-Nitrogen containing compounds, i.e. mainly Mea and its reaction products with extractives, are released in important quantities from CBA treated wood, especially at low pH.-The release of copper is the result of competitive reactions: fixation via complexation reactions and complexation with extractives in the liquid phase. The specific pH dependency of Cu leaching is explained by the competition of ligands for protonation and complexation.-Tebuconazole is released to a lesser extent relative to its initial content. Its fixation on solid wood structure seems to be influenced by pH, suggesting interactions with OH groups on wood. Boron release appears to be pH independent and very high. This confirms its weak fixation on wood and also no or weak interaction with the extractives.
► A pH dependent leaching mechanism for CBA treated wood is described.
► The fixation and mobilisation of inorganic and organic biocides was investigated.
► Extractives' quantity and nature depend on pH.
► Competition of ligands for protonation and complexation explains Cu behaviour.
► Tebuconazole seems to interact with OH groups on wood.
Journal: Science of The Total Environment - Volume 444, 1 February 2013, Pages 522–530