Photodegradation of organophosphates in face masks
In this study,we analyzed the photodegradation behavior of several OPEs in face masks.Medical surgical masks and N95 masks were selected to studied under both non-humidified and humidified(simulated wearing)conditions by analyzing the content of OPEs as well as the fragments of OPEs using UPLC-Q-TOF-MS to explore the degradation pathways.The results showed that the photodegradation of OPEs in masks under the non-humidified condition was in accordance with the primary kinetic reaction,and the OPEs degraded faster and with shorter half-lives in the medical-surgical mask matrix compared with the N95 masks.The degradation rates of trim ethylene phosphate(TCP),2-ethylhexyl diphenyl phosphate(EHDPP),tri-n-butyl phosphate(TNBP),tris(2-butoxyethyl)phosphate(TBEP),and tris(1,3-dichloro-2-propyl)phosphate(TDCIPP),in disposable medical masks increased by 7.02％,8.32％,39.1％,83.6％and 257％,respectively,compared with those in N95 masks.OPEs selectively absorbed light at different wavelengths,and they can absorb more photons in the UVC wavelength band of light.The application of UV light significantly increased the rate of degradation of OPEs,and the longer the light exposure time was,the more energy was absorbed by OPEs and the more they were degraded.The degradation products of four monomers,TBEP,TCEP,TCIPP and TDCIPP,were identified by secondary mass spectrometry fragment ion analysis.The degradation pathways of TBEP included hydroxylation,oxidation and hydrolysis reactions,and the degradation pathways of TCEP,TCIPP and TDCIPP were all hydrolysis reactions.
face masksorganophosphate estersphotodegradationdegradation pathway
万方数据
维普
