Meaning
Analytical methods in mass spectrometry measure chemical compounds by comparing the analyte signal against that of a known substance added to the sample. This technique of internal standard quantification compensates for sample loss during the complex extraction steps required for polymer additive analysis. It provides the exact concentration of slip agents, plasticizers and antioxidants present in a raw resin.
The process ceases to be effective if the chosen reference substance reacts with the polymer matrix or elutes at the exact same time as the target analyte.
Calibration Design
Calibration procedures must account for instrument drift and minor injection volume discrepancies over long sequences of runs. Employing internal standard quantification allows the laboratory to calculate a response factor that remains valid despite variation in the split ratio of the injector. It uses chemically similar but distinct compounds, often deuterated analogues, to establish a stable ratio.
This systematic design protects the integrity of the data generated during routine resin screening.
Measurement Control
Moulding operations that produce food-contact items must verify that migration levels remain below legal limits. Utilizing internal standard quantification offers a reliable way to measure these minute migrations into food simulants. It gives the raw material buyer the necessary documentation to prove compliance with international safety regulations.
This documentation shields the moulder from the severe financial liabilities associated with product recalls.
Sourcing Economics
Resin compounding relies on precise additive ratios to maintain both mechanical performance and material cost targets. If the concentration of a costly light stabilizer drifts below the specified threshold, the molded parts may fail due to premature UV degradation. With internal standard quantification, the compounder avoids both the expense of over-additive dosing and the risk of under-additive failure.
It optimizes the use of expensive virgin additives while ensuring that any incorporated regrind material is properly boosted to meet performance baselines.
