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Optimized sample preparation for isotopic analysesof CO2 in air: systematic study of precision andaccuracy dependence on driving variables during CO2purification process

Publikation: Bidrag til tidsskriftTidsskriftartikel


  • Teresa Bertolini
  • Mauro Rubino

A systematic analysis of efficiency, reproducibility and accuracy of cryogenic purification of CO2 from air

samples for isotopic analyses is presented. The technical characteristics of the cryogenic line are given

in detail. To study the cryogenic process, three different operating parameters are considered: flow rate

of the gas entering the line, pressure of the gas in the line, and CO2-trap shape. Experimental results

demonstrate that efficiency, reproducibility and accuracy strongly depend on the CO2trap shape. Moreover,

a dependence of reproducibility and accuracy on the flow rate of the gas is found, but not on its pressure.

High precision (=0.02‰ for d13C and =0.05‰ for d18O) and good accuracy (<0.09‰ for d13C and <0.14‰

for d18O) is achieved after applying the N2O correction

TidsskriftJournal of Mass Spectrometry
StatusUdgivet - 2005
Eksternt udgivetJa

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