Most of the samples analyzed using the Finigan MAT253 mass spectrometer
are produced on-line with the "Kiel" automated carbonate device containing
48 reaction vessels in a carousel attached to two parallel extraction lines.
Both lines feed into the Mass Spec via one capillary.
We analyze three different standards in the A and B lines during
each carousel run of 46 samples; at the beginning, middle and end of each
carousel. These three standards (B1, NBS19 or Carrera and our working standard
Atlantis II) span a d 18O range of 5.6 per mil (-2.2
to 3.4 per mil VPDB), typical of most planktonic and benthic foraminiferal
carbonates. In addition, we periodically run NBS18 and NBS20 to constrain
our interlaboratory calibration.
- NBS19 Weight vs Kiel Pressure
- Carrara Expansions vs
The Kiel Carbonate device is not able to precisely measure samples
whose weight is greater than 400 µg, or 3 expansions (see
Even with correction (see
data produed with analyses of greater than
3 expansions are unreliable. Red is the A line and Blue is the B line in these