Colorado Plateau Stable Isotope Laboratory
 

Dissolved Inorganic Carbon (DIC) and Dissolved Organic Carbon (DOC) via TOC-IRMS

Click here to access a pdf copy (152 Kb) of the TOC-IRMS poster presented at NABS 2003, in Athens, GA, May 27th-June 1st, 2003.

Click here to access a pdf copy (208 Kb) of the TOC-IRMS poster presented at NABS 2004, in Vancouver, BC, June 6th-June 10th, 2004.

Water samples are analyzed for stable isotopes (¹³C) and concentration (ppm C) data on DIC and/or DOC from the same vial using an O.I. Analytical Model 1010 TOC analyzer interfaced to a Finnigan DELTA ^plus XL isotope-ratio mass spectrometer (St. Jean 2003). The autosampler on the TOC analyzer requires that samples be filtered and collected in ICHEM 200 series 40-ml glass bottles (Cat no. 246-0040). Preservation methods depend on whether DIC and/or DOC are to be analyzed from the same vial.  Currently, we use a saturated solution of HgCl₂ to preserve samples (Kaplan 1994).

Please view our protocol for sample collection and preservation.

Or, contact the lab manager for more information.

References

Kaplan, L.A. 1994. A field and laboratory procedure to collect, process, and preserve freshwater samples for dissolved organic carbon analysis. Limnology and Oceanography 39: 1470-1476.

St. Jean, G. 2003. Automated quantitative and isotopic (¹³C) analysis of dissolved inorganic carbon and dissolved organic carbon in continuous-flow using a total organic carbon analyser. Rapid Communications in Mass Spectrometry 17: 419-428.

CPSIL

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Acknowledgements:  CPSIL has been in operation since May, 1999, and was funded through a grant from the National Science Foundation (DBI 9729600) and from Northern Arizona University.

Send mail to Richard.Doucett@nau.edu with questions, comments, and/or corrections about this web site.
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