过氧化氢降解有机磷农药的研究——I．降解性能及影响因素

研究了过氧化氢对甲胺磷、毒死蜱及久效磷等3种有机磷农药的降解性能及影响因素．结果表明过氧化氢对有机磷农药有明显降解作用，平均比不加过氧化氢的处理降解率提高了5～13倍．紫外光照下，H2O2降解农药比普通光下的降解率提高3～9倍，比无光照处理提高10～20倍．初始pH4～6时，有机磷农药降解率最低，提高酸性或碱性都使农药降解率提高，且碱性比酸性条件更有利于农药的降解．通O2条件对H2O2光催化降解有机磷农药的效率有一定的抑制作用．农药的降解率都随反应时间的延长而增加；随H2O2初始浓度增大而提高；随农药浓度增加而降低，而降解量则随其初始浓度增加而增加．

The degradation of organophosphorus pesticides by hydrogen peroxide I. Characters and influencing factors of the degradation

The characters and influencing factors of the degredation of organophosphorus pesticides of methamidophos, chlorpyrifos and monocrotophos by hydrogen peroxide (H_2O_2) were studied. The result showed that hydrogen peroxide had highly activity in degrading the organophosphorus pesticides, and the degradation rates were 5-13 times of that of the treatment without H_2O_2.Ultraviolet radiation could significantly increase the degradation of the pesticides, which were 3-9 times of the treatment with daylight, and 10-20 times of the treatment without light. When the initial pH-value was at 4-6,the lest degradation rates were gotten, while the rates increased with high basic condition. However, the degradation was restrained with the use of O_2. The degradation rates increased with the time of reaction. The degradation of pesticides was expected to get even better results at higher concentration of H_2O_2 concentration, and the degradation rates was decreased with more chemical added, however, the degraded amount increased.