Abstract
Glyoxal (m.w. 58 g/mol) is a highly reactive molecule associated with some basic biological processes. Glyoxal is associated with oxidation stress [1], with catalytic reaction formed basic organic molecules in inorganic environment [2] and is ono of the products of oxidation of anthropogenic and biogenic volitale organic compounds (VOC) [3].
Previous PTR-MS study [4] showed significant dependence of the m/z 59 product abundance on humidity. Moreover, a signal at m/z 31 (probably protonated formaldeyhde CH2OH+) resulting from glyoxal reaction was observed, which correlated with the system's humidity.
In present investigation, SIFT-MS experiment [5] was used for investigation of ion-molcular interaction of glyoxal with H3O+, NO+ and O2 .+ reagent ions at variable humidities. In advance, we provided injection of water through helium carrier gas, avoiding interaction of water with glyoxal in the sampling system.
For H3O+ reagent ion we observed behaviour similar to PTR-MS study [4]. Adittionally, humidity dependence for glyoxal water clusters were obtained.
For NO+ and O2 .+ reagent ions we observed ion formation comparable to previous SIFT investigations [6-7]; formation of OC(H)C(H)O(NO)+ ion and OC(H)C(H)O.+ ion from NO+ and O2 .+ reagent ions, respectivly. Humidity dependence was estimated for these ions as well.