Basic Training 4th Annual ICP Conference

Managing Interferences

Identification

• Isobaric (two isotopes similar mass) • e.g., 40 Ca and 40 Ar • ~200 masses available 6 Li

238 U

• 67 masses (33%) have isobars • 140 masses to measure 70 elements

• Polyatomic (molecular)

• ~450 identified ( Atom. Spect. 1998 ) • Specific to instrument

Correction equations

Managing Interferences

Identification

• Isobaric (two isotopes similar mass) • e.g., 40 Ca and 40 Ar • ~200 masses available 6 Li

238 U

• 67 masses (33%) have isobars • 140 masses to measure 70 elements

• Polyatomic (molecular)

• ~450 identified ( Atom. Spect. 1998 ) • Specific to instrument • Identifying your interferences

Correction equations