170135_inorganicventures_flipping

Managing Interferences

Correction equations • Math! • Require:

• Measuring the interfering element • Knowing the nature of the interference • Isobaric? • Polyatomic?

• Isobaric = easy • Polyatomic requires characterizing interfering molecule as function of parent, e.g., Q: 10,000 cps of Ce generates how many cps of CeO? A: 300 cps CeO if tuning produces CeO / Ce of 3%

Managing Interferences

Correction equations - Isobaric Example: need to measure 116 Sn in presence of 116 Cd

1. Measure interference free Cd isotope ( 111 Cd) 2. Calculate 116 Cd signal using isotopic abundances for 111 Cd and 116 Cd

116 Cd cps

= 111 Cd cps

* ( 116 Cd ab

/ 111 Cd ab )

3. Subtract calculated 116 Cd signal from 116 Sn signal 4. Relies only upon signal intensities and fixed isotopic abundances