摘要
研究了臭氧对乐果的降解效果及其影响因素。试验结果表明,当初始臭氧浓度为10mg·L-1时,5min内可使乐果降解80%左右,延长反应时间,乐果降解率无明显增加。同时,通过在乐果和臭氧的反应液中再分别添加重碳酸盐与叔丁醇,探讨臭氧降解乐果的反应机理,结果表明臭氧降解乐果是分子反应。GC-MS检测经臭氧处理的水样发现有氧化乐果存在,表明若臭氧处理不完全,水样中可产生毒副产物。
Effectiveness of ozone degrading dimethoate in solution and its affecting factors were studied.The results showed that when the initial concentration of ozone was 10 mg·L^(-1),80% of the dimethoate could be degraded within 5 min.After that,however,the degradation did not significantly increase with the time.The mechanism of ozone reacting with dimethoate was investigated by adding radical scavengers such as bicarbonate and tert-butanol.The results appeared to confirm that the degradation of dimethoate by ozone in the experiment condition followed the mechanism of molecular reaction.At the same time,through GC-MS analysis,omethoate was still found in the water treated with ozone.This shows that harmful byproduct will result from inadequate treatment with ozone.
出处
《农村生态环境》
CSSCI
CSCD
北大核心
2004年第3期70-72,76,共4页
Rural Eco-Environment
基金
宁波市博士基金项目(2004A610016)
宁波市科技计划项目(2002C10002)
关键词
乐果
臭氧
降解
机理
氧化乐果
dimethoate
ozone
degradation
mechanism
omethoate
