Meaning
Analytical instrument combining gas chromatography with high-resolution mass spectrometry to identify volatile substances. Gc-qtof allows for the detection and characterization of unknown compounds in polymer extracts with extremely high mass accuracy. The instrument is used until the molecular weight of the target exceeds the capability of the gas phase transition.
Molecular Identification
Determination of the chemical formula of an unknown substance relies on the precise measurement of its mass to four decimal places. Gc-qtof provides the fragment patterns needed to distinguish between isomers that have the same nominal mass. This capability is essential for identifying non-intentionally added substances that migrate from plastic packaging.
Residue Analysis
Quantifying small amounts of additives or impurities ensures that the resin meets the required purity standards. Gc-qtof can detect contaminants at parts per billion levels, making it more sensitive than standard quadrupole systems. This sensitivity helps in troubleshooting odor issues or identifying the source of a batch failure.
Instrument Resolution
Separation of closely related chemicals depends on the ability of the time of flight detector to record arrival times with nanosecond precision. Gc-qtof creates a clear picture of the complex mixture of chemicals found in recycled plastics. High resolution prevents the overlapping of peaks, allowing for a more confident assignment of chemical structures.
The technology represents the most advanced tool for chemical fingerprinting in the polymer industry.
