Molecular Labeling
Chemical reference compounds where hydrogen atoms are replaced by deuterium function as highly precise calibrants for mass spectrometry. In testing labs, deuterated internal standards provide a baseline to correct for losses during sample preparation and variations in instrument response. Because these molecules behave almost identically to their unlabeled counterparts during extraction but separate cleanly in mass-to-charge ratio, they provide the benchmark for quantitation.
Calibration Precision
Accuracy in gas chromatography mass spectrometry depends on adding a known amount of these reference materials directly to the dissolved polymer sample before any purification step occurs. If some of the analyte is lost during subsequent purification or extraction steps, the deuterated internal standards are lost in the exact same proportion, which allows the analysis software to calculate the original concentration with high confidence. This correction mechanism is indispensable for analyzing complex printed board materials like solder masks and adhesive layers, where the resin matrix heavily interferes with standard detection methods.
Using these chemicals ensures that the reported concentrations of restricted plasticisers remain accurate even when the sample undergoes complex multi-step cleanup procedures.
Process Boundary
The use of these compounds is constrained by their cost and the availability of specific isotope-labeled variants for each target analyte. Separation boundaries are reached when analyzing simple, non-interfering matrices where direct calibration curves suffice without isotopic correction.
