Diffusion of potentially toxic elements from treated wood in soil

The planar source diffusion method was used to evaluate the leaching of As, Cu, and Cr ions from CCA-treated wood into soils. Treated pine and eucalyptus wood was investigated in clayey and sandy soils, whose diffusion coefficients of the order of 10−12 m2 s−1 were higher for Cr(VI), followed by As(V) and Cu(II) for both soils. In addition, a pilot experiment in plastic pots simulated multidirectional diffusion in the soil by CCA from wood. The mobility was higher for Cu(II), followed by Cr(III/VI) and As(V). An important finding was the pronounced leaching of CCA in clayey soils, which emphasizes the role of environmental features in the dynamics and mobility of contaminants. This study stands out for its emphasis on the potential for CCA- treated wood to pollute and the fundamental role of different conditions. The results allow us to warn about the environmental pollution of PTE in soils with CCA-treated wood constructions. Environmental regulations are expected to encourage the industry to make wood treatment more environmentally friendly.

本研究采用了平面源扩散法，以评估三氧化二砷（As）、铜（Cu）和铬（Cr）离子从CCA处理的木材中向土壤中的浸出情况。研究调查了在粘土和沙质土壤中处理的松木和桉木，两种土壤的扩散系数为10^-12 m^2 s^-1，其中铬（VI）的扩散系数较高，其次是砷（V）和铜（II）。此外，通过CCA处理木材在塑料盆中进行的试点实验模拟了土壤中的多向扩散。其中，铜（II）的迁移性最高，其次是铬（III/VI）和砷（V）。一项重要发现是CCA在粘土土壤中的显著浸出，这突出了环境特征在污染物动态和迁移性中的作用。本研究因其对CCA处理木材污染潜力的重视以及不同条件的基本作用而脱颖而出。研究结果使我们能够对CCA处理木材构建的土壤中的持久性有机污染物（PTE）的环境污染发出警告。预计环境法规将鼓励行业使木材处理更具环境友好性。