“…30 In terms of air-and moisture-free sample introduction, some techniques have been described whereby a nitrogenous atmosphere is either attached to the MS source, such as a glove bag 31,32 and a small glove chamber. 33 On a larger scale, a glovebox can be modified to accommodate a feedthrough port for tubing going directly into the MS source. 34,35 The need for a simple, cheap, robust method of air-and moisturefree sample introduction was obvious, hence the development of Pressurized Sample Infusion (PSI).…”