Development of small CO2 gas measurements with AixMICADAS
Résumé
After three years of tests and developments, the performances of the AixMICADAS facility have been established for small CO 2 samples with a carbon mass inferior to 100 μg. The instrument shows very good stability and reliability when measuring small samples with its gas ion source. In this configuration, the precision is mainly limited by counting statistics and also the accuracy by contamination effects for the smallest samples (< 20 μgC). A long term variability of 7-8‰ is evaluated with 80-100 μgC NIST oxalic acid 2 samples and modern carbonate samples. Our pretreatment and analytical protocols allow for very low blank levels corresponding to 14 C ages of 53,000 years BP and 48,000 years BP for carbonate samples and organic materials, respectively.
Origine : Fichiers produits par l'(les) auteur(s)
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