Bai Yanhong, Chen Jierong, Mu Hui, Zhang Chunhong, Li Baoping
Department of Chemistry, School of Science, Xi'an Jiaotong University, Xi'an 710049, China.
J Agric Food Chem. 2009 Jul 22;57(14):6238-45. doi: 10.1021/jf900995d.
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, GC/MS 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.
在食品和环境水体中降解农药，迫切需要一种实用、廉价且绿色的化学工艺。在本研究中，通过气相色谱法（GC）测定了O₂等离子体处理对玉米中敌敌畏（DDVP）和氧乐果降解的影响。利用气相色谱/质谱联用仪（GC/MS）对固体表面DDVP和氧乐果进行O₂等离子体处理时的中间体或产物进行鉴定，研究了主要的等离子体诱导降解机制。结果清楚地表明，O₂等离子体处理对降解原始DDVP和氧乐果具有显著效果，降解效率主要取决于相关操作参数和农药的化学结构。此外，GC/MS分析表明，DDVP和氧乐果分子降解为毒性较小的化合物，农药的等离子体降解机制可能以自由基反应为主导。得出结论：O₂等离子体有潜力降低农产品中的农药残留。
