【摘要】 农药在自然水体光化学反应中,·OH是一活跃的自由基,本文阐述了一种测定农药与·OH反应速率的方法及体系,测定了十种中国、美国水田常用农药与·OH的反应速率;在室内及中国、美国稻田条件下,测定了几种具代表性常用农药的降解速率,并与·OH反应速率进行比较.结果表明,自然水体中农药的降解速率与其·OH反应活性之间存在相关性,可用于预测农药在水体中的持久性.更多还原

【Abstract】 OH is known to be the most reactive radical in photochemical process of pesticides in natural waters. A simple system was developed to determine the reactivity of pesticides towards hydroxyl, and the reaction rates of ten common rice pesticides in PRC and US have been measured by this system. PRC and US both measured the dissipation rates of several common pesticides in laboratory and in rice fields. Results indicated that an empirical relationship between pesticide persistence in sunlight natural waters and relactivity towards hydroxyl radical. This relationship would be useful to predict the fate and persistence of pesticides in waters.更多还原