Fig. 2: Chemical characteristics of oxidized ML films and modeling fittings.
From: Fast autoxidation of unsaturated lipid films on indoor surfaces
a Direct infusion ESI(+)-Orbitrap-MS spectra of fresh ML film, film irradiated for 3 h in the flow reactor, aged in the dark environment for 23 h, oxidized by •OH ( ~ 1 ppt, Relative Humidity ~ 22%) for 24 h and oxidized by O3 ( ~ 160 ppb) for 42 h (Relative Humidity ~ 38%). b TSQ Endura neutral loss scan MS/MS spectrum of ML film aged for 17 h in dark indoors. The peaks were identified as ROOH ions. c, d Concentration time profiles of ROOH formed from ML films under irradiation (Relative Humidity ~ 38%) and aging in dark indoors. The right Y axis indicates the molar ratio of formed ROS to the original concentration of ML ([ML]0). e The variation of ROOH concentration of the irradiated film left in the dark flow reactor (blue) or in the dark indoor environment (red). All error bars in this and other figures denote the standard deviations calculated from experimental replicates. f–h Concentration time profiles of ROOH or ROS formed from ML films exposed to gaseous •OH radicals or ozone. The model fits in Figs (c, d and f) were based on the kinetics modeling shown in Fig. 4. Source data are provided as a Source Data file.
