Oxidized pesticides in drinking water
Posted: Wed Oct 08, 2008 11:48 am
Hi
I analyze pesticides in drinking water by SPE-GC-MS. In drinking water the Cl2 reacts with the pesticides and another oxidized form appears. When we take the sample we add Sodium tiosulfate to eliminate the Cl2 and to stop the reaction. But the pesticides have reacted, and in the water there are the oxidized forms. I know some oxidized forms of the organophosphate pesticides (the P=S is transformed to P=O; Diazinon to Diazoxon; Malathion to Malaoxon…) but there are some pesticides of which I don’t know the oxidized form, like Aldrin, Ametryn, Prometryn, Terbutryn... This is important because in the drinking water these pesticides are only in the oxidized form and I read an article (EPA/600/R-05/103 August 2005) that it says that some oxidized forms are more toxic than the corresponding pesticide. We want to know these forms to analyze them.
Somone knows where can I find more information about this?
Thanks
I analyze pesticides in drinking water by SPE-GC-MS. In drinking water the Cl2 reacts with the pesticides and another oxidized form appears. When we take the sample we add Sodium tiosulfate to eliminate the Cl2 and to stop the reaction. But the pesticides have reacted, and in the water there are the oxidized forms. I know some oxidized forms of the organophosphate pesticides (the P=S is transformed to P=O; Diazinon to Diazoxon; Malathion to Malaoxon…) but there are some pesticides of which I don’t know the oxidized form, like Aldrin, Ametryn, Prometryn, Terbutryn... This is important because in the drinking water these pesticides are only in the oxidized form and I read an article (EPA/600/R-05/103 August 2005) that it says that some oxidized forms are more toxic than the corresponding pesticide. We want to know these forms to analyze them.
Somone knows where can I find more information about this?
Thanks
