Meaning
Signal reduction phenomenon occurring during liquid chromatography mass spectrometry when co-eluting substances interfere with the ionization of the target analyte. In the analysis of polymer extracts, high concentrations of surfactants and plasticizers can compete for charge on the surface of the droplets. This competition results in a lower signal for the trace components being measured, potentially leading to an underestimation of their concentration.
Quantification Accuracy
Reliable data depends on recognizing when the matrix is preventing the detector from seeing the full amount of a substance. The electrospray matrix suppression of a polyolefin extract is often managed by using internal standards that allow for the correction of signal loss.
Sample Preparation
Reducing the complexity of the extract through additional cleanup steps like solid phase extraction helps to minimize interference. By removing the bulk of the polymer resin before injection, the lab ensures that the remaining compounds do not overwhelm the ionization source.
Analytical Precision
Variations in the resin formulation can change the degree of signal loss from one batch to another. Consistent monitoring of the background noise and the response factor of the target compounds is necessary to maintain the integrity of the screening process across different material lots.
