Meaning
Analytical yields in mass spectrometry describe how effectively a liquid sample is converted into gas-phase ions. For the analysis of plastic additives, electrospray ionization efficiency determines the sensitivity of the equipment when detecting trace amounts of slip agents or flame retardants. High efficiency is required to identify contaminants that are present at parts-per-billion levels.
Molecule Charge
Charging the analyte molecules is a necessary step before they can be separated by their mass. The electrospray ionization efficiency depends on the chemical structure of the additive and the composition of the solvent used for extraction. Polar compounds generally show much higher yields than non-polar hydrocarbons.
Detection Limit
Identifying the lowest possible concentration of a substance depends on the strength of the signal relative to the background noise. If the electrospray ionization efficiency is low, a technician may be unable to confirm the presence of a regulated migrant even if it is present in the sample. This can lead to false negative results in safety audits for food-grade polymers.
Measurement Power
Modern laboratory instruments use specialized nozzles and voltage settings to maximize the ion count. Improving the electrospray ionization efficiency allows for the analysis of smaller samples, which is useful when testing thin films or coatings.