We demonstrate that N2 largely affects the ionization process,
whereas H2 affects both the ionization process and in-plasma reactions.
Our investigations also suggest that dissociative electron capture is the main ionization route for formation of Br− ions.
Importantly, GC-PARCI-MS shows a uniform response factor for bromine across brominated compounds of drastically different
chemical structures, confirming PARCI’s ability to quantify organobromines in the absence of compound-specific standards. Over
3 orders of magnitude linear dynamic range is demonstrated for bromine quantification. We report a detection limit of 29 fg of
bromine on-column, ∼4-fold better than inductively coupled plasma-MS