Trapp S, Miglioranza K S, Mosbaek H
Technical University of Denmark, DK-2800 Lyngby, Denmark.
Environ Sci Technol. 2001 Apr 15;35(8):1561-6. doi: 10.1021/es000204f.
The sorption from water to wood (KWood) of 10 organic chemicals (log KOW, 1.48-6.20) was experimentally determined for oak (Quercus robur) and basket willow (Salix viminalis). Linear regression yielded log KWood = -0.27 (+/- 0.25) + 0.632 (+/- 0.063) log KOW for oak (r = 0.90, n = 27) and log KWood = -0.28 (+/- 0.40) + 0.668 (+/- 0.103) log KOW for willow (r = 0.79, n = 27). According to an equilibrium-partitioning model, wood should be an important storage compartment for lipophilic environmental chemicals, but this is contrary to analytical results. Diffusive uptake from air into wood was estimated to be a relevant transport process only for chemicals with a high KAW. Uptake of chemicals from soil via xylem into stem was simulated with a dynamic one-compartment model. This pathway seems to be important for chemicals with low and intermediate lipophilicity. In large trees, the chemicals are retained for a long time. If metabolism inside the stem occurs, wood can serve as a "safe sink" for environmental chemicals. This might be of use in phytoremediation.
针对橡木（欧洲栎）和柳条（多枝柳），通过实验测定了10种有机化学品（log KOW为1.48 - 6.20）从水到木材的吸附系数（KWood）。线性回归得出，橡木的log KWood = -0.27（±0.25）+ 0.632（±0.063）log KOW（r = 0.90，n = 27），柳条的log KWood = -0.28（±0.40）+ 0.668（±0.103）log KOW（r = 0.79，n = 27）。根据平衡分配模型，木材应该是亲脂性环境化学品的一个重要储存隔室，但这与分析结果相反。据估计，只有对于具有高KAW的化学品，从空气到木材的扩散吸收才是一个相关的传输过程。用动态单隔室模型模拟了化学品从土壤通过木质部进入茎干的吸收过程。对于低亲脂性和中等亲脂性的化学品，这条途径似乎很重要。在大树中，化学品会被长时间保留。如果茎干内部发生代谢，木材可以作为环境化学品的“安全汇”。这在植物修复中可能会有用处。
