Meaning
An advanced high-resolution mass spectrometry instrument that combines a quadrupole mass filter with a time-of-flight mass analyzer to provide highly accurate mass measurements is qtof ms. This mass spectrometer is widely used for the non-targeted screening of complex extracts from plastic and polymer materials.
Resolution Capability
Standard mass spectrometers often cannot distinguish between compounds with identical nominal masses but different chemical formulas. With qtof ms, the high mass resolution allows the instrument to determine the mass of ions to four decimal places, enabling the calculation of precise elemental compositions. This high accuracy is essential for distinguishing between native polymer additives and environmental contaminants in complex matrices.
Additive Identification
Identification of non-intentionally added substances is simplified by the dual capabilities of precursor ion selection and high-resolution fragment analysis. In a single run, the quadrupole selects a target ion, which is then fragmented, and the resulting daughter ions are analyzed with high precision. This structural information helps laboratories construct and verify chemical structures without requiring an authentic reference standard for every potential migrant.
Quality Control
In recycled polymer compounding, the presence of unexpected trace chemicals is a constant risk. Applying qtof ms during batch testing allows compounders to rapidly identify and catalog these substances, ensuring they do not exceed toxicological thresholds. By providing a comprehensive chemical profile of the extractables, this instrument enables the selection of safer, higher-quality resin lots for demanding applications such as medical devices or food packaging.
