Academic Journals Database
Disseminating quality controlled scientific knowledge

A new CF-IRMS system for the quantification of the stable isotopes of carbon monoxide from ice cores and small air samples

ADD TO MY LIST
 
Author(s): Z. Wang | J. E. Mak

Journal: Atmospheric Measurement Techniques Discussions
ISSN 1867-8610

Volume: 2;
Issue: 5;
Start page: 2689;
Date: 2009;
VIEW PDF   PDF DOWNLOAD PDF   Download PDF Original page

ABSTRACT
A new simultaneous analysis technique for stable isotope ratios (δ13C and δ18O) of atmospheric carbon monoxide (CO) from ice core samples and small air samples is presented, based on an on-line cryogenic vacuum extraction followed by continuous-flow isotope ratio mass spectrometry (CF-IRMS). The CO extraction system includes two multi-loop cryogenic cleanup traps, a chemical oxidant for oxidation to CO2, a cryogenic collection trap, a cryofocusing unit, purification by gas chromatography, and subsequent injection into a Finnigan Delta Plus IRMS. Analytical precision of 0.2‰(±1σ) for δ13C and 0.6‰(±1σ) for δ18O can be obtained for 100 mL (STP) air sample with CO mixing ratio ranging from 60 to 140 ppbv (~268–625 pmol CO). Six South Pole ice core samples with depth ranging from 133 to 177 m are also processed for CO isotope analysis based on a wet extraction line attached to the above cryogenic vacuum system. This is the first report on measuring isotope ratios of CO in ice core samples.
Affiliate Program     

Tango Rapperswil
Tango Rapperswil