170135_inorganicventures_flipping

Internal Standards

Ni

Y La Pb

30.00

Internal Standards • Matrix matching (dilution factor) • Instrument drift • Standard bracketing • Calibration curve Managing interferences • Identification • Correction equations

calibration curve

25.00

20.00

15.00

10.00

Concentration (ppm)

5.00

0.00

0

100

200

300

400

Time (min)

Managing Interferences

Identification

• Isobaric (two isotopes similar mass) • e.g., 40 Ca and 40 Ar • ~200 masses available 6 Li 238 U • 33% (67) have isobars • 140 masses to measure 70 elements • Polyatomic (molecular)

Correction equations