31P-NMR evaluation of organophosphorus pesticides degradation through metal ion promoted hydrolysis

被引：0
|
作者：
Masoumeh Sarkouhi
Mojtaba Shamsipur
Jalal Hassan
机构：
[1] Tarbiat Modares University,Department of Chemistry
[2] Razi University,Department of Chemistry
[3] University of Tehran,Department of Toxicology, School of Veterinary Medicine
来源：
Environmental Monitoring and Assessment | 2012年 / 184卷
关键词：
P-NMR; Organophosphorus pesticides; Metal ions; Degradation;
D O I：
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学科分类号：
摘要：
The degradation of some organophosphorus pesticides (OPPs) in the presence of metal ions was studied by 31P-NMR spectroscopy. Both 31P-NMR and gas chromatography/mass spectroscopy results were used in order to determine the nature of metabolites formed after degradation. The degraded organophosphorus pesticide were investigated for chlorpyrifos and phoxim in the presence of several metal ions including Hg2+, Cu2+, Cd2+, Ni2+, Pb2+, and Ag+. 31P-NMR results indicated Ag+ and Hg2+ ion promoted degradation of OPPs and other metal ions formed complex with OPPs and cannot degrade OPPs. We found that the degradation of chlorpyrifos and phoxim with Ag+ or Hg2+ led to the formation of O,O-diethyl-O-methyl phosphorothionate, (C2H5O)2(CH3O)PS, at metal ion/pesticide mole ratios ≤1.0 and completely decomposed at a higher mole ratio of 10. Finally, the method was successfully applied to the degradation study of a number of technical and formulated pesticides in the presence of Ag+ ion at a metal ion/pesticide mole ratio of 10.
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页码：7383 / 7393
页数：10
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