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环境化学

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

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%.

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 NH₄⁺ at low pE,which had no effect on the photolysis of acetamiprid. As pE increased,the main forms of inorganic nitrogen are NO₂^- and NO₃^-,which inhibited the photolysis of acetamiprid. 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%.