【摘要】 模拟研究了环境中氮发生形态转化时对啶虫脒在水体中光解的影响.结果表明,啶虫脒的光解反应符合一级动力学规律.pE反映了体系的氧化还原性,环境pE值较低时,无机氮主要以NH4+形式存在,对啶虫脒光解几乎没有影响;随着pE值的提高,无机氮逐渐由NH4+形式向NO2-和NO3-形式转化,NO2-、NO3-的存在均对啶虫脒的光解有抑制作用,它们对啶虫脒光解的抑制是由于对光辐射的竞争性吸收所引起的.多种形态无机氮共存时,其对啶虫脒光解的抑制作用不是简单的加和关系,各形态无机氮之间存在一定的拮抗作用.当环境pE值达到7.2后,无机氮主要以NO3-形式存在,其对啶虫脒光解的抑制率最高可达36.71%.更多还原

【Abstract】 The roles of different forms of inorganic nitrogen in the photolysis of acetamiprid was simulated at different environmental pE values. The results show that the photolysis of acetamiprid follows first-order kinetics. The main form of inorganic nitrogen is NH+4 at low pE,which had no effect on the photolysis of acetamiprid. As pE increased,the main forms of inorganic nitrogen are NO-2 and NO-3,which inhibited the photolysis of acetamiprid. The inhibiting effects of NO-3 and NO-2 on the photolysis of acetamiprid were caused by competitive absorption of the irradiation from the mercury lamp. The inhibiting effects of mixed forms of NO-3 and NO-2 or NO-2 and NH+4 on the photolysis of acetamiprid were not simply additive,which indicates that interaction may exist between NO-3 and NO-2 or NO-2 and NH+4. At high pE,the main form of inorganic nitrogen is NO-3,and the maximal inhibition of the photolysis of acetamiprid reached 36.71%.更多还原