In order to have an accurate evaluation of the sublimate trapped and overcome concentration-related variations due to the evaporation of the trapping liquid, a known amount of internal standard (1,3,5trimethoxbenzene) was added to the DMSO solution before, and the analyte amount was calculated based on its signal for each spectrum collected. Additionally, a correct quantitative information was ensured by a T1 analysis separately conducted on a pristine solution of the analyte prior to the monitoring experiment (Figures ).