【摘要】 多环芳烃(PAHs)是具有"三致"效应的持久性有机污染物.通过盆栽及微生物培养实验,考察了植物、施磷量及PAHs共存对菲(PHE)、芘(PYR)和二苯并蒽(DBA)去除率的影响,发现PHE的降解率和降解菌量均高于PYR和DBA.盆栽实验中,植物种植和给植物施加高磷浓度的营养液可促进DBA的降解;微生物培养实验表明共存的PAHs之间存在相互作用,而这种作用随PAHs种类不同可表现为促进降解作用(如PHE促进DBA降解)、无作用(如PYR和DBA)或抑制作用(如PYR抑制PHE+DBA降解).PHE对DBA降解的促进作用随时间的增加而减弱,这可能与PHE浓度降低和DBA中间产物的毒性及其积累有关.更多还原

【Abstract】 Polycyclic aromatic hydrocarbons(PAHs) are persistent organic pollutants with toxic,mutagenic and carcingenic properties.Pot experiment and microplate experiments are conducted to investigate the impact of plant cultivation,phosphorus fertilization and PAHs co-existence on the removal rate of phenanthracene(PHE),pyrene(PYR) and dibenzo \ anthracene(DBA).Results show that the dissipation and degraders of PHE are significantly higher than those of PYR and DBA in both pot and microplate experiments.In pot experiment,plants and higher quantity of phosphorus fertilizer increase DBA dissipation.Different interactions are obtained among the co-existing PAHs.The results show that co-existence of different PAH compounds can lead to synergistic co-metabolism(PHE enhanced DBA degradation),no co-metabolism(PYR and DBA) and inhibition of PAH degradation(PYR inhibited PHE+DBA degradation).The positive effect of PHE on DBA dissipation decreases with time course,which is probably due to the decrease of PHE concentration or the toxicity and accumulation of DBA degradation products in the substrate.更多还原