Departamento de Quimica Analitica, Nutricion y Bromatologia, Instituto de Investigacion y Analisis Alimentario, Campus Sur, Universidad de Santiago de Compostela, E-15706 Santiago de Compostela, Spain.
Rapid Commun Mass Spectrom. 2009 Dec;23(23):3673-87. doi: 10.1002/rcm.4301.
The characterization of by-products arising from the UV photodegradation of two insecticide pyrethroids lacking the cyclopropane ring (flucythrinate and fenvalerate) has been investigated by gas chromatography coupled with mass spectrometry (GC/MS). Twenty photoproducts were tentatively identified mainly based on the interpretation of the experimental mass spectra or by using reference mass spectra. Some of these compounds had not previously been detected. Furthermore, the generation of some of the photoproducts might be a matter for concern due to their potential toxicity. The corresponding photodegradation routes, including postulation of the intermediate radicals, have also been proposed. These photodegradation studies were performed by photo-solid-phase microextraction (photo-SPME) in which the SPME fibre was exposed to light after extraction of the target analytes from aqueous solutions. The degradation kinetics of the investigated pyrethroids and the photoformation-photodegradation curves of the photoproducts generated in situ were also monitored through the ion chromatograms obtained for different irradiation times and the corresponding mass spectra.
采用气相色谱-质谱联用技术（GC/MS）对两种不含环丙烷的杀虫剂拟除虫菊酯（氟氯氰菊酯和氰戊菊酯）的 UV 光降解副产物进行了特征描述。根据实验质谱的解释或使用参考质谱，初步鉴定了 20 种光产物。其中一些化合物以前没有被检测到。此外，由于某些光产物可能具有潜在毒性，因此它们的产生可能需要引起关注。还提出了相应的光降解途径，包括中间自由基的假设。这些光降解研究是通过光固相微萃取（photo-SPME）进行的，在 photo-SPME 中，在从水溶液中萃取目标分析物后，SPME 纤维暴露于光下。通过获得不同辐照时间的离子色谱图及其相应的质谱，监测了所研究的拟除虫菊酯的降解动力学以及原位生成的光产物的光形成-光降解曲线。
