摘要
研究了H2O2光降解动力学机理及其降解液的毒性.结果表明,光照对H2O2降解农药有显著影响,农药降解率随反应时间延长而增加.有机磷农药的H2O2光催化降解符合零级反应动力学,其反应速率常数(k)随农药浓度的增加而增大,半衰期(t0.5)延长.用生测法测定降解液残留物的毒性发现,H2O2光催化降解农药是降毒降解的.10μg/mL甲胺磷、10μg/mL毒死蜱、100μg/mL久效磷的H2O2光催化降解初始反应液处理家蚕Bombyxmori2龄幼虫的24h死亡率分别为60%、100%、100%,而12h降解液的死亡率均小于5%.黄曲条跳甲Phyllotretastriolata生物测定所得结果与家蚕结果一致.
Degradation kinetics and virulence were studied in present thesis. The results showed that the light exerts much influence on the degradation process and as time went by, the degradation rates increased. All the degradation of the organophosphorus pesticides could be described by zero-order kinetics. The kinetics constant (k) would be larger with the increase of pesticides initial concentration, and the half-life time (t_(0.5)) would be longer. The bioassay of the toxicity showed that the photocatalytic degradation allowed a elimination of the toxicity of the solution. When the 2-instar larvae of Bombyx mori were treated with the initial reacting solution of 10 μg/mL methamidophos, 10 μg/mL chlorpyrifos, 100 μg/mL monocrotophos, their 24 h mortalities were 60%, 100% and 100% respectively, but the mortalities of the 12 h degraded-solutions were all less than 5%, which were confirmed with the treatment of Phyllotreta striolata.
出处
《华南农业大学学报》
CAS
CSCD
北大核心
2004年第2期37-40,共4页
Journal of South China Agricultural University
