Meaning
High-sensitivity analytical instruments quantify trace chemical species, residual monomers and degradation additives within complex polymer matrices. Polymer characterization labs employ triple quadrupole mass spectrometry to isolate precursor ions and analyze resulting product fragments with extreme selectivity. This tandem mass spectrometry configuration eliminates background matrix interferences that obscure low-concentration target compounds in recycled plastics or food-contact materials.
The scope covers quantitative trace chemical analysis, excluding routine molecular weight distribution testing by gel permeation chromatography.
Fragment Analysis
Tandem mass filters operate in series to isolate target molecules from background matrix components. The first quadrupole selects specific precursor ions based on mass-to-charge ratios. Inside the second quadrupole collision cell, inert gas impacts fragment these precursor ions into secondary product ions.
Triple quadrupole mass spectrometry then uses the third quadrupole to filter selected product ions for detector counting, achieving exceptional signal-to-noise ratios.
Trace Detection
Detecting ultra-trace contaminants in post-consumer recycled resins requires high analytical sensitivity. The technique quantifies residual photoinitiators and degradation products down to sub-parts-per-billion levels. Low detection limits prevent non-compliant materials from entering sensitive food packaging supply chains.
Quantitation Precision
Calibration curves constructed from isotopic internal standards yield accurate mass concentration data across wide dynamic ranges. High selectivity reduces sample preparation clean-up steps during extractable and leachable testing programs.
