- δ 13C and δ18O values of carbonates are determined using a MultiCarb system in line with a GV IsoPrime mass spectrometer in Dual Inlet. Several replicates of the international standard NBS19, and two lab standards (CaCO3 I & II) are analyzed along with the samples for each run. Long term external precisions for C and O are ± 0.05‰ and ± 0.07‰, respectively.
- Sample size: analysis is performed on bulk powder samples containing about 10 to 100 μg calcite or aragonite.
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Use our file “Sample name form for 13C18Ocarbonates” to fill in the names of each sample.