Academic Journals Database
Disseminating quality controlled scientific knowledge

A new CF-IRMS system for quantifying 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
ISSN 1867-1381

Volume: 3;
Issue: 5;
Start page: 1307;
Date: 2010;
VIEW PDF   PDF DOWNLOAD PDF   Download PDF Original page

ABSTRACT
We present a new analysis technique for stable isotope ratios (δ13C and δ18O) of atmospheric carbon monoxide (CO) from ice core samples. The technique is an online cryogenic vacuum extraction followed by continuous-flow isotope ratio mass spectrometry (CF-IRMS); it can also be used with small air samples. 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, gas chromatography purification, and subsequent injection into a Finnigan Delta Plus IRMS. Analytical precision of 0.2‰ (±1δ) for δ13C and 0.6‰ (±1δ) for δ18O can be obtained for 100 mL (STP) air samples with CO mixing ratios ranging from 60 ppbv to 140 ppbv (~268–625 pmol CO). Six South Pole ice core samples from depths ranging from 133 m to 177 m were processed for CO isotope analysis after wet extraction. To our knowledge, this is the first measurement of stable isotopes of CO in ice core air.

Tango Jona
Tangokurs Rapperswil-Jona

     Save time & money - Smart Internet Solutions