Electron Ionization

Fragmentation Pattern

Monomeric migration testing relies on reproducible mass spectra generated when high velocity electrons collide with solvent residues trapped within porous cellulose matrices. Mass spectrometers record abundance counts across distinct mass to charge intervals for every compound exiting gas chromatograph columns during thermal desorption cycles. Structural identification proceeds by matching recorded fragment distributions against reference libraries compiled from pure plasticizer and photoinitiator standards.

Instrument operators adjust emission currents to maintain stable ionization yields while analyzing complex extracts recovered from multilayer paper packaging samples.

Detection Threshold

Signal sensitivity depends directly on ionization efficiency governed by filament temperature and acceleration voltage settings within the vacuum chamber. Low atomic mass fragments scatter readily unless quadrupole filters optimize ion transmission toward secondary electron multipliers operating at high gain. Analytical laboratories establish baseline detection limits by injecting known quantities of target migrants through identical thermal extraction pathways.

Calibration curves convert integrated peak areas into absolute mass concentrations required for regulatory declarations regarding packaging safety.