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  Global Journal of Analytical Chemistry. Volume 2, Issue 3 (2011) pp. 107-113
  Research Article
 
Investigation of oxidative degradation of molinate in various oxidation treatment systems by using Liquid Chromatography – Tandem Mass Spectrometry
  Chuan Wanga,b, Evelyn Chamberlainb,c, Honglan Shia,b, Craig D. Adamsb,d, Yinfa Maa,b,*  
     
a Department of Chemistry, Missouri University of Science and Technology, Rolla, MO 65409, USA
b Environmental Research Center, Missouri University of Science and Technology, Rolla, MO 65409, USA
c Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
d Department of Civil, Architectural and Environmental Engineering, University of Kansas, Lawrence, KS 66045, USA

   
  Abstract  
  Thiocarbamate pesticides, which are widely used in agriculture, have attracted considerable attention because of their impact on people’s health and adverse effect on environmental safety. In this study, the removal efficiency of molinate by various oxidants and identification of the degradate of molinate in water at different oxidation treatment conditions were investigated using LC-MS/MS. The oxidants tested were, free chlorine (FC), monochloroamine (MCA), UV radiation (UV), chlorine dioxide (ClO2), permanganate (MnO4-), ozone (O3), and hydrogen peroxide (H2O2). Hexahydro-1-H-azepane-1-carboxylic acid was detected as being a major degradate of molinate after its treatment with free chlorine and ozone, while no degradates were present after treatment by other oxidants. Kinetic results for a typical free chlorine degradation indicated that the reaction of molinate with free chlorine was extremely fast. Hexahydro-1-H-azepane-1-carboxylic acid, the molinate degradate, showed more resistant to free chlorine in the same treatment. A possible degradation pathway of molinate is proposed.
     
  Keywords  
  Molinate; Oxidation degradates; Hexahydro-1-H-azepane-1-carboxylic acid; HPLC/MS/MS  
     
   
   
   
   
     

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