Impact of surface water conditions on preservative leaching and aquatic toxicity from treated wood products
Impact of surface water conditions on preservative leaching and aquatic toxicity from treated wood products
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DOI：
10.1021/es062990f
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发表时间：
2007-05-15
影响因子：
11.4
通讯作者：
Bitton, Gabriel
中科院分区：
文献类型：
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作者：
Dubey, Brajesh;Townsend, Timothy;Bitton, Gabriel
新的替代木材防腐剂含有更高水平的铜（Cu），这可能会增加天然水系统中的水生毒性。早期的工作重点是使用实验室产生的沥滤溶液评估毒性。在这项研究中，防腐剂的浸出和水生毒性的影响，从处理过的木材产品进行了评估，使用天然表面沃茨，包括沃茨从两条河流，三个湖泊，两个湿地，和一个海水，除了合成的中度硬水和去离子水。在静态条件下，对用铜基替代品（如碱性铜季铵盐（ACQ）和铜硼唑（CBA））处理的木材块，以及沿着铬酸铜砷酸盐（CCA）处理的木材进行浸提，并测量总铜、不稳定铜和重金属毒性。结果表明，ACQ和CBA处理的木材浸出约10倍和20倍以上的总铜相对于CCA处理的木材和存在的有机和无机配体在自然沃茨降低铜的不稳定部分相对于实验室产生的浸出液。水生毒性被认为与不稳定的铜部分，因此，水生毒性的处理木材沥滤液是较低的自然沃茨相比，实验室浸出液。本研究的结果表明，设计用于评估处理过的木材的影响的研究，因此，应考虑络合作用，减少不稳定的铜馏分和其潜在的作用，降低毒性。
New alternative wood preservatives contain higher levels of copper (Cu) which can promote aquatic toxicity in natural water systems. Earlier work focused on evaluating toxicity using laboratory generated leaching solutions. In this study, the impact on preservative leaching and aquatic toxicity from treated wood products was evaluated using natural surface waters including waters from two rivers, three lakes, two wetlands, and one seawater, in addition to synthetic moderate hard water and deionized water. Blocks of wood treated with Cu based alternatives such as alkaline copper quaternary (ACQ) and copper boron azole (CBA), along with chromated copper arsenate (CCA)-treated wood, were leached under quiescent conditions, and total Cu, labile Cu, and heavy metal toxicity were measured. Results show that ACQ- and CBA-treated wood leach approximately 10 and 20 times more total Cu relative to CCA-treated wood and that the presence of organic and inorganic ligands in natural waters lowered the labile fraction of Cu relative to that from laboratory generated leaching solutions. Aquatic toxicity was found to correlate with the labile Cu fraction, and hence, the aquatic toxicity of the treated wood leachates was lower in natural waters in comparison to laboratory leaching solutions. The results of the present study suggest that studies designed to evaluate the impacts of treated wood should therefore consider the role of complexation in reducing the labile Cu fraction and its potential role in decreasing toxicity.