Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 57, Issue 14, Pages 6238-6245Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf900995d
Keywords
Reduction; dichlorvos residues; omethoate residues; degradation mechanisms; O-2 plasma treatment
Funding
- Shaanxi Provincial Centre of Disease Control and Prevention
- National Natural Science Foundation of China [20877062, 30571636]
- Innovative Science and Technology of Shaanxi Province [2008ZDKG-78]
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A practical, inexpensive, and green chemical process is greatly needed for degrading pesticides in food and environmental water. In this work, the impact of O-2 plasma treatment on reduction of dichlorvos (DDVP) and omethoate in maize was determined by gas chromatography (GC). The main plasma-induced degradation mechanisms were investigated through identification of intermediates or products during O-2 plasma treatment for DDVP and omethoate on solid surfaces by gas chromatography/mass spectrometry (GC/MS). The results clearly demonstrate that O-2 plasma treatment is significantly effective in the degradation of original DDVP and omethoate, and the degradation efficiency mainly depends upon related operating parameters and chemical structures of pesticides. Moreover, GUMS analyses show that DDVP and omethoate molecules are degraded into less-toxic compounds, and the plasma degradation mechanisms for pesticides can be dominated by a free-radical reaction. It is concluded that O-2 plasma has the potential to reduce pesticide residues in agricultural products.
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