A~2/O工艺处理后焦化废水对玉米根尖细胞遗传稳定性的影响及其氧化损伤效应

用不同体积浓度生化出水对玉米进行水培试验,测定了处理后的玉米根尖细胞微核率、玉米幼苗抗氧化酶活性、活性氧水平以及氧化产物含量,目的在于探讨生化出水的生态风险性,并为其生物监控指标的确定提供一定的理论依据.结果表明,生化出水处理后,玉米根尖细胞微核率显著上升,玉米幼苗叶片中H2O2、PCO和MDA的含量明显增加,POD和CAT的活性升高,而SOD的活性却降低.这一结果提示,经过处理后的焦化废水其中污染物含量大幅降低,但其生态风险依然存在,这可能与植物体内自由基水平的升高有关.

Effect of Coking Wastewater after Treatment with A2/O Process on Hereditary Stability in Maze Root Cells and Associated Oxidative Stress

Hydroponic experiment on maize with effluent of different volume concentrations coking wastewater was carried out.After the hydroponic experiment,the micronucleus rate of root tip,Antioxidant enzyme activities,the level of reactive oxygen species and oxidation products content of maize seedings were measured in order to explore the ecological risk of effluent and provide a theoretical basis to determine its biological monitoring indexes.The results showed that after treatment by different concentrations of effluent,the micronucleus rate of treated root tip and the content of H2O2,PCO,MDA in maize seedings increased significantly,the activities of POD and CAT increased also while the activity of SOD decreased.The results suggested that the coking wastewater contaminants are significantly reduced after treatment,but there is still certain ecological risk,this may be related with elevated levels of free radicals in plants.