In: Chemistry
Explain why ICP-MS is more sensitive than ICP-AES.
ICP-MS (Inductively coupled plasma - mass spectrometry) and ICP-OES (Inductively coupled plasma - optical emission spectrometry), both are employed to detect the specific element.
Characteristics | ICP-MS | ICP-OES |
Autosampling plasma | Argon based plasma | Argon based plasma |
measurment | atomic mass of ions and atoms | wavelength of light emitted by ions and atoms |
lower detection limit | in parts per trillion (ppt) | in parts per billion (ppb) |
sensitivity | highly sensitive (expensive option) | more vigorous in action (cheaper and less selective) |
type of samples |
low matrix samples: diluted ones, less concentrated to keep up with the multielement detection feature. It has low tolerance for TDS analyses samples with low regulatory limits. Isotopic analysis can be done |
high matrix samples like: containing high percentage of dissolved solids (TDS), suspended solids. Robust for analysing the samples: ground water, wastewater, soil, and solid waste, elements with high regulatory limits |
The argon-based plasma is used in aqueous aerosols and offers high energy for drying, dissociation, atomization, and ionization of the analytes.