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ABSTRACT
Cycloxaprid (CYC) is a new cis-configuration neonicotinoid insecticide, which is currently under development in China for agricultural pest control. Considering the photodegradation of CYC is important for the application of CYC in the future, the photochemical behavior of CYC in aqueous solution was herein investigated in a “merry-go-round” reactor under a 300 W high-pressure mercury lamp. Twenty-five photodegradation products were identified via UPLC-TOF-ESI-MS/MS. The results suggested that NTN32692, the precursor of CYC was the predominant photodegradation product. CYC photodegrades via a more complex mechanism than imidacloprid and four potential photodegradation pathways were proposed.
Acknowledgments
The authors thank Prof. Youjun Yang of East China University of Science and Technology for revising the manuscript and Waters Company in Shanghai for suppling the instruments of an ultra-performance liquid chromatography liquid chromatography-time of flight-electrospray ionization mass spectrometry (UPLC-TOF-ESI-MS/MS).
Funding
This work was financially supported by National Natural Science Foundation of China (21272071).