author(s)
Teimour Hazratian, Mohammad Reza Abai, Ali Jalilian, Sahar Bazrafkan, Maryam Tavassoli, Hasan Bakhshi, Masoomeh Pirmohammadi, Hassan Vatandoost, Mansoureh Shayeghi, Farzad Shayeghi

abstract
In order to study the residues of Diazinon and Sevin insecticides in Saymareh and Konjanchem Rivers, Ilam province, Iran, the rivers water samples were collected in April 2010 to July 2011, throughout the Ilam province. Thin layer chromatography was used, since it was the best applicable method in area with reasonably high level of sensitivity up to 0-01 ppm and acceptable recovery of 80%. On 3 samples was conducted to assess two insecticide residues in various phases of the Saymareh and Konjanchem Rivers from the day after the spraying of the Diazinon and Sevin insecticides until when no trace of the insecticide was detectible in the studied Rivers of the study area. The highest level of Diazinon was detected the day after the spraying of station 3 of Saymareh River in amount of 1.97 ppm. Also the highest level of Sevin was detected the day after the spraying of station 1 of Saymareh River in amount of 2.33 ppm.