Meaning
Screening procedures for chemical substances in complex mixtures aim to identify unknown compounds without a pre-defined list of analytes. In polymer characterization, non-target analysis detects unexpected additives, degradation products, or contaminants that might be present in the resin. This methodology is essential for assessing recycled plastics where the origin of the feedstock is unknown.
Analytical Protocol
High-resolution mass spectrometry coupled with gas chromatography provides the primary means of scanning the chemical profile. Through non-target analysis, researchers can match the spectral patterns of unidentified peaks against extensive commercial libraries. This process allows the detection of volatile organic compounds that might migrate from the final moulded part.
Polymer Sourcing
Recycled resin streams frequently carry trace impurities that are difficult to predict. Utilizing non-target analysis allows compounding plants to screen incoming post-consumer regrind for harmful substance traces. This screening step protects the production line from running material that fails regulatory compliance guidelines.
Quality Assessment
Ensuring the purity of plastic materials used in sensitive applications requires rigorous screening. While targeted tests confirm the concentration of known slip agents and antioxidants, non-target analysis provides the only way to detect unexpected chemical reaction byproducts. This testing method is becoming a standard procedure for medical-grade polymers.
Laboratories use it to establish baseline chemical fingerprints for each new resin supplier.
