摘要
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 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.
出处
《华南农业大学学报》
CAS
CSCD
北大核心
2004年第1期44-47,共4页
Journal of South China Agricultural University
