期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 27, 页码 10928-10932出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0904230106
关键词
cavity ring-down spectroscopy; combustion; isotopic ratio
资金
- Picarro, Inc.
A continuous-flow cavity ring-down spectroscopy (CRDS) system integrating a chromatographic separation technique, a catalytic combustor, and an isotopic C-13/C-12 optical analyzer is described for the isotopic analysis of a mixture of organic compounds. A demonstration of its potential is made for the geochemically important class of short-chain hydrocarbons. The system proved to be linear over a 3-fold injection volume dynamic range with an average precision of 0.95 parts per thousand and 0.67 parts per thousand for ethane and propane, respectively. The calibrated accuracy for methane, ethane, and propane is within 3 parts per thousand of the values determined using isotope ratio mass spectrometry (IRMS), which is the current method of choice for compound-specific isotope analysis. With anticipated improvements, the low-cost, portable, and easy-to-use CRDS-based instrumental setup is poised to evolve into a credible challenge to the high-cost and complex IRMS-based technique.
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