不同形态氮转化对啶虫脒在水溶液中光解的影响  

The role of different forms of inorganic nitrogen in the photolysis of acetamiprid

作　　者：李超[1] 谢国红[2] 刘国光[1,3] 郑立庆[1] 井文杰[1] 

机构地区：[1]河南师范大学化学与环境科学学院,新乡453007 [2]河南科技学院资源与环境学院,新乡453003 [3]广东工业大学环境科学与工程学院,广州510006

出　　处：《环境科学学报》2009年第9期1918-1922,共5页Acta Scientiae Circumstantiae

基　　金：河南省创新人才工程资助项目(No.教高[2001]513)~~

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%.The roles of different forms of inorganic nitrogen in the photolysis of aeetamiprid 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 NH4＋ at low pE, which had no effect on the photolysis of aeetamiprid. As pE increased, the main forms of inorganic nitrogen are NO2- and NO3- , which inhibited the photolysis of aeetamiprid. The inhibiting effects of NO3- and NO2- on the photolysis of acetamiprid were caused by competitive absorption of the irradiation from the mercury lamp. The inhibiting effects of mixed forms of NO3- and NO2 or NO2- and NH4 on the photolysis of acetamiprid were not simply additive, which indicates that interaction may exist between NO3- and NO2- or NO2- and NH4＋ . At high pE, the main form of inorganic nitrogen is NO3- , and the maximal inhibition of the photolysis of acetamiprid reached 36.71%.

关 键 词：啶虫脒 光解 硝酸根 亚硝酸根 PE 

分 类 号：X131[环境科学与工程—环境科学]