首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Persistence and biodegradation of selected organophosphorus insecticides in flooded versus non-flooded soils
Authors:T K Adhya  P A Wahid  N Sethunathan
Institution:(1) Laboratory of Soil Microbiology, Central Rice Research Institute, 753006 Cuttack, India;(2) Present address: Radiotracer Laboratory, College of Horticulture, 680654 Vellanikkara, India
Abstract:Summary The persistence of parathion, methyl parathion and fenitrothion in five tropical soils of varying physicochemical characteristics was compared under flooded and non-flooded conditions. The degradation of all the three insecticides was more rapid under flooded conditions than under non-flooded conditions in four out of five soils. Degradation of these insecticides proceeded by hydrolysis under non-flooded conditions and essentially by nitro group reduction and to a minor extent by hydrolysis under flooded conditions. Kinetic analysis indicated that degradation of the three insecticides followed a first-order reaction irrespective of the soil and water regime. The degradation of these organophosphorus insecticides was accelerated after repeated applications to flooded alluvial soil. Nitro group reduction was the major pathway of degradation for all the three insecticides after the first addition while the rate of hydrolysis increased after each successive addition.
Keywords:Parathion  Methyl parathion  Fenitrothion  Flooded and non-flooded soils  Persistence  Repeated additions  Accelerated biodegradation
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号