Detection Mechanism
Analytical identification techniques ionize chemical compounds, fragment molecular structures, and sort resulting ions according to mass-to-charge ratios. Testing laboratories employ mass spectrometry coupled with gas chromatography or liquid chromatography to identify unknown migrants and photoinitiators in paperboard packaging. Standard procedures conform to ISO 17025 laboratory quality criteria and EN 13628 volatile substance identification frameworks.
Quantification becomes limited when non-ionizable compounds fail to produce stable gas-phase ions inside ionization chambers.
Analytical Procedure
Eluted molecules entering the mass spectrometer source undergo electron ionization or chemical ionization to form positive or negative ion fragments. Quadrupole mass analyzers or time-of-flight mass analyzers separate these fragments by applying electromagnetic fields or measuring ion flight velocities. Detectors record ion abundance across specified mass-to-charge ranges, generating characteristic mass spectra for each eluted compound.
Spectral comparison against reference libraries enables definitive identification of unknown contaminants in food contact papers. Single ion monitoring modes isolate specific fragment masses, increasing signal sensitivity for trace target compound quantification. Calibration standard series quantify positive hits down to microgram per square metre concentration levels.
Identification Boundary
Structural isomers yielding identical fragment spectrum profiles require complementary chromatographic separation or nuclear magnetic resonance confirmation. High background noise caused by column stationary phase bleed reduces signal resolution for high-boiling analytes.
