Journal
ANALYTICA CHIMICA ACTA
Volume 614, Issue 2, Pages 165-172Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2008.03.041
Keywords
formic acid; acetic acid; methanol; ethanol; HPLC-IRMS; stable carbon isotope ratio
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A suitable analysis condition was determined for high performance liquid chromatography-isotope ratio mass spectrometry (HPLC-IRMS) while making sequential measurements of stable carbon isotope ratios of delta C-13 in formic acid, acetic acid, methanol and ethanol dissolved in water. For this online column separation method, organic reagents are not applicable due to carbon contamination; thus, water and KH2PO4 at low concentrations were tested as mobile phase in combination with a HyPURITY AQUASTAR (TM) column. Formic acid, acetic acid, methanol and ethanol were separated when 2 mM KH2PO4 aqueous solution was used. Under the determined analysis condition for HPLC-IRMS, carbon concentrations could be measured quantitatively as well as carbon isotope ratio when carbon concentration was higher than 0.4 mM L for each chemical. (c) 2008 Elsevier B.V. All rights reserved.
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