摘要
选择有机氯、二硝基苯胺、噻二唑、有机磷、乙酰胺、三嗪、尿嘧啶和氨基甲酸酯等8类26种广泛使用的农药,系统研究了它们与紫外光(UV254,平均光强10.8 mW.cm-2)、臭氧(4.1～6.2 mg.L-1)和高锰酸钾(15.8 mg.L-1)在pH 7.0,室温(25℃±3℃)条件下30 min的反应活性.结果表明,紫外光可有效降解杀螨酯、土菌灵、甲草胺、丁草胺、异丙甲草胺、毒草胺、莠去津、西玛津、涕灭威、灭虫威和杀线威(降解率>95%),其它农药降解率在12.9%～77.7%之间.臭氧完全降解地茂散、敌敌畏、除草定、涕灭威、甲萘威、呋喃丹、杀线威和灭虫威;扑草通和涕灭威砜无降解;其它农药降解率在19.0%～93.1%之间.高锰酸钾完全降解敌敌畏、涕灭威和灭虫威;有机氯类、噻二唑类、二硝基苯胺类、乙酰胺类、氨基甲酸酯类其它农药无降解;其它农药降解率在16.0%～88.2%之间.如果考虑饮用水处理的常规投加剂量,那么臭氧有希望去除大部分农药,高锰酸钾只能去除少数几种农药,而紫外光可能无法完全去除任何一种农药.
The reactivity of eight classes of 26 extensively used pesticides, namely, organochlorines, thiadiazole, dinitroanaline, acetamides, triazines, uracil and carbamates, with three common disinfectants or oxidants including UV254 （average intensity of 10.8 mW· cm^-2）, ozone （dosage of 4.1 - 6.2 mg·L^-1 ） and permanganate （dosage of 15.8 mg·L^-1） was investigated. The reactions were allowed to proceed for 30 min at pH 7.0 and ambient temperature （25℃ ＋ 3℃ ）. Results indicate that under the applied experimental conditions, more than 95% of chlorobenzilate, etridiazole, alachlor, butachlor, metolaehlor, propachlor, atrazine, simazine, aldicarb, oxamyl and methiocarb could be effectively removed by UV254 ; and the removal efficiencies of other pesticides were in a range of 12.9%-77.7% . Ozone could completely degrade chloroneb, dichiorvos, bromacil, aldiearb, carbaryl, carbofuran, oxamyl and methiocarb; prometon and aldicarb sulfone were resistant to ozonation; and the removal efficiencies of other pesticides varied from 19.0% to 93.1%. Permanganate could fully degrade dichlorvos, aldicarb and methiocarb; organochlorines, dinitroanaline, thiadiazole, acetamides and other carbamates were resistant to permanganate oxidation; and the removal efficiencies of other pesticides ranged from 16.0% to 88.2% . If the practical dosage applied in drinking water treatment is considered, it is expected that most of the pesticides will be completely degraded by ozone, a few by permanganate, but probably none by UV254.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第1期127-133,共7页
Environmental Science
基金
国家自然科学基金项目(20677071)
国家科技支撑计划项目(2006BAJ08B02
2006BAJ08B10)
关键词
农药
紫外光
臭氧
高锰酸钾
降解
饮用水处理
pesticide
UV
ozone
permanganate
degradation
drinking water treatment
