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ConFlo III - An interface for high precision δ 13C and δ 15N analysis with an extended dynamic range

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons62603

Werner,  R. A.
Service Facility Stable Isotope/Gas Analytics, Dr. W. A. Brand, Max Planck Institute for Biogeochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons62347

Bruch,  Beate A.
Service Facility Stable Isotope/Gas Analytics, Dr. W. A. Brand, Max Planck Institute for Biogeochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons62345

Brand,  W. A.
Service Facility Stable Isotope/Gas Analytics, Dr. W. A. Brand, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Citation

Werner, R. A., Bruch, B. A., & Brand, W. A. (1999). ConFlo III - An interface for high precision δ 13C and δ 15N analysis with an extended dynamic range. Rapid Communications in Mass Spectrometry, 13(13), 1237-1241.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-CC2A-C
Abstract
A newly developed interface coupling a CHN combustion device (elemental analyser 'EA') to an isotope ratio mass spectrometer is described and evaluated. The purpose of the device is to extend the dynamic range of delta(13)C and delta(15)N analysis from less than 2 orders of magnitude to more than 3 orders of magnitude. Carbon isotope ratio measurements of atropine as a model compound have been performed analysing between 1 mu g to 5 mg C with acceptable to excellent precision (0.6 to 0.06 parts per thousand, delta-notation). The correction due to the blank signal is critical for sample amounts smaller than 4 mu g C. The maximum sample weight is determined by the combustion capacity of the EA, Larger sample amounts are measured using dilution of a small part of the EA effluent with helium. The dilution mechanism works virtually free of isotope fractionation, Copyright (C) 1999 John Wiley & Sons, Ltd. [References: 19]