1. Decontamination of Dichlorvos by Hydrogen Peroxide
- Author
-
Hai Ling Xi, Hong Jie Zhao, Zhan Guo Li, and Wei Qin Wang
- Subjects
chemistry.chemical_compound ,Reaction mechanism ,chemistry ,Oxalic acid ,Dichlorvos ,Inorganic chemistry ,General Engineering ,Acetaldehyde ,Hydrogen peroxide ,Phosphate ,Phosphoric acid ,Nuclear chemistry ,Trimethyl phosphate - Abstract
H2O2 aerosol was used to oxidize dichlorvos vapor. 80.7% of dichlorvos, with the initial concentration of 90.9 mg/m3, was decontaminated when the H2O2 concentration kept in the range of 110~130 mg/m3 within 60 min. According to the oxidation products, analyzed by GC-MS, the decontamination reaction mechanism was discussed. Radical chain reaction is the main decontamination mechanism. H2O2 is dissociated to HOO-, which can induce the formation of ·OH. The double bond in dichlorvos molecule is attacked by ·OH to form molecule radical, which is further oxidized to 1,1-dichloro ethoxy dimethyl phosphate, 1,1,1-trichloro-2-hydroxyl-ethyl dimethyl phosphate, dimethyl phosphite, dimethyl phosphate, trimethyl phosphate, methyl phosphate, dichloro acetaldehyde, oxalic acid, CH2Cl2, CHCl3, parts of which are mineralized to phosphoric acid, CO2, H2O and chloridion.
- Published
- 2013