In-situ monitoring of atmospheric degradation product studies of aromatic hydrocarbons with CAPI- and APLI-MS

摘要

A multidimensional analytical setup was establshed for in-situ monitoring of degradation studies in particular aromatic hydrocarbons. (1) APLI selective and sensitive for ring retaining products. (2) CAPI non-selective and sensitive. (3) PICI information on gas phase basicity. (4) NICI e.g., nitro-group containing compounds are amenable; information on electron affinity or gas phase acidity. (5) Different ionization positions. comparison of differently progressed ion chemistry yields information on chemical reactivity of species; preservation of MS information. (6) Temporal evolution of product formation. time resolution below 1s, with limits of detection in the lower ppbV range for CAPI and pptV range for APLI; positive and negative mode. (7) CID structural information. (8) FT-IR structural information; partial quantification, but low sensitivity. Several degradation studies were successfully performed.