^(14)-C菲在“植物-火山石-营养液-空气”系统中的迁移和转化

Transportation and transformation of ^(14)C-phenanthrene in closed chamber (nutrient solution-lava-plant-air) system.

利用放射性同位素示踪技术 ,研究14 C 菲在“植物 火山石 营养液 空气”封闭系统中的迁移转化 .结果表明 ,菲在该系统中降解较快 ,实验进行到 2 3d时 ,营养液中的放射性含量仅为施入时的 2 5 % .实验结束 (46d)时 ,14 C放射性在该系统各部分间的分布顺序为根 (38.5 5 % ) >挥发性有机代谢产物 (VOCs ,17.6 8% ) >火山石(14 .35 % ) >CO2 (11.42 % ) >茎 (2 % ) ;植物体内的放射性物质主要以结合态 (根 4.6 8% ;茎叶 0 .6 8% )与植物组织结合和以极性代谢产物 (根 2 3 .14 % ;茎 0 .78% )形式存在 .

The transportation and transformation of 14 C phenanthrene in a closed ‘plant lava nutrient solution air’ chamber system was studied by using radioactivity technology. The results showed that in this closed chamber system,phenanthrene was degraded fast.The radioactivity of 14 C left at 23d in the nutrient solution was only 25% of applied.At the end of experiment (46d),the distribution sequence of 14 C activity in the components of closed chamber system was root (38.55%)>volatile organic compounds (VOCs, 17.68%)>lava (14.35%)>CO 2(11.42%)> stem (2%). 14 C activities in plant tissue were combined with the tissue,and existed in the forms of lava bound(root 4.68%; stem and leaves 0.68%) and polar metabolites (root 23.14%; stem 0.78%).