水流模拟断面中硝基苯的迁移转化规律

Research of Nitrobenzene's Translocation and Transformation Rule in Simulative Section of Stream

采用实验室模拟装置研究了4,10和20℃条件下,封闭、开放状态和不同环境因素影响下硝基苯污染水团流经模拟断面前后,硝基苯在上覆水与沉积物中的迁移转化规律.结果表明:封闭、开放状态模拟断面上覆水和沉积物中硝基苯迁移分配受温度变化影响显著;开放状态下,上覆水、沉积物中硝基苯变化量均低于封闭状态.挥发不但影响硝基苯在沉积物-上覆水间的迁移分配,而且能促进沉积物中硝基苯的解吸;光照对模拟断面硝基苯迁移转化无影响.对于相同的沉积物和上覆水,影响模拟断面系统中硝基苯迁移、分配的因素依次为温度、挥发和光照.分析实验结果和材料推测,硝基苯在该实验条件下不存在降解转化.

The translocation and transformation rules of nitrobenzene were conducted at 4, 10 and 20 ℃by laboratory simulative equipment under the closed, open systems with different environment factors. The results indicated that nitrobenzene translocation and distribution between the overlying water and the sediment is significantly affected by the temperature. Under open status, nitrobenzene contents both in the overlying water and the sediment are lower than the counterparts of closing status. Evaporation not only affect nitrobenzene translocation and distribution but also accelerate desorption of sediment. However, illumination has little effect on nitrobenzene translocation. For the same water-sediment system, the influencing factors of nitrobenzene translocation and distribution in the simulative system were temperature, evaporation and illumination. The detecting results also indicated that there is no possibility for nitrobenzene to transformation in this experiment conditions.