有机磷酸酯在口罩基质中的光降解  

Photodegradation of organophosphates in face masks

作　　者：苏子涵 袁睿妤 王璨 周雪 何明靖[1,2] SU Zihan;YUAN Ruiyu;WANG Can;ZHOU Xue;HE Mingjing(College of Resources and Environment,Southwest University,Chongqing,400715,China;Chongqing Key Laboratory of Agricultural Resources and Environment,Chongqing,400716,China)

机构地区：[1]西南大学资源环境学院,重庆400715 [2]重庆市农业资源与环境研究重点实验室,重庆400716

出　　处：《环境化学》2024年第12期4011-4021,共11页Environmental Chemistry

基　　金：重庆市自然科学基金(cstc2021jcyj-msxmX0085)资助.

摘　　要：本研究探讨了几种常见有机磷酸酯(OPEs)在口罩基质中的光降解行为,在未加湿和加湿(模拟人体佩戴)两种条件下,对医用外科口罩和N95医用防护口罩两种基质进行光降解研究,通过超高效液相色谱飞行时间质谱(UPLC-Q-TOF-MS)检测口罩中OPEs含量并通过碎片离子分析探讨降解途径.结果表明,未加湿条件下,OPEs在口罩基质中的光降解过程符合一级动力学反应,与N95口罩基质相比,OPEs在医用外科口罩基质中降解得更快,半衰期更短,其中磷酸三甲苯酯(TCP)、2-乙基己基二苯基磷酸酯(EHDPP)、磷酸三正丁酯(TNBP)、磷酸三丁氧乙酯(TBEP)、磷酸三(1,3-二氯-2-丙基)酯(TDCIPP)等5种物质在一次性医用口罩中的降解速率相较于N95口罩分别增加了7.02%、8.32%、39.1%、83.6%和257%.OPEs会选择性的吸收不同波长的光,其能在UVC波段的光中吸收更多的光子.施加UV光照能明显提高OPEs降解的速率,且光照时间越长,OPEs吸收的能量越多,降解得越多.通过二级质谱碎片离子分析,共发现了TBEP、TCEP、TCIPP和TDCIPP等4种单体的降解产物,其中,TBEP的降解途径包括羟基化、氧化、水解反应,TCEP、TCIPP、TDCIPP等3种物质的降解途径均是水解反应.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 medicalsurgical 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.

关 键 词：口罩基质 有机磷酸酯 (OPEs) 光降解 降解途径. 

分 类 号：X-1[环境科学与工程] O6[理学—化学]