Inductively Coupled Plasma Mass Spectrometry or ICP-MS is an analytical technique used for elemental determinations. We extract the metals from filters using HCl/HNO3, then the extract was diluted and analyzed by ICP-MS. An ICP-MS combines a high-temperature ICP (Inductively Coupled Plasma) source with a mass spectrometer. The ICP source converts the atoms of the elements in the sample to ions. These ions are then separated and detected by the mass spectrometer.