Definition - What does Mobile Phase mean?
The mobile phase is part of gas chromatography mass spectrometery testing. It is an an inert gas that the sample is injected into that will carry it through the stationary phase, it moves the sample so that it is mobile. The analysis of the sample solution takes into account the interactions between these two phases as the mobile phase moves through the stationary phase.
SureHire explains Mobile Phase
In gas chromatography mass spectrometry urine drug screening, the mobile phase is one of two phases, the other being the stationary phase, that the sample solution enters into during testing. The mobile phase is an inert gas that the sample is injected into that will carry it through the stationary phase, which is normally a solid. The sample solution is analyzed as it the mobile phases interacts and moves through the stationary phase. During this interaction, the compounds being tested for will be collected by the mobile phase, and then later as the mobile phase continues through the stationary phase, these compounds will cease moving, separate, and be absorbed. This separation and absorption is what specifically yields the results.