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On-line determination of δ18O values of organic substances

✍ Scribed by R.A. Werner; B.E. Kornexl; A. Roβmann; H.-L. Schmidt

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
542 KB
Volume
319
Category
Article
ISSN
0003-2670

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✦ Synopsis

A new method for the automated sample preparation and on-line isotope ratio determination of S"O values of organic compounds is presented. The principle of the production of CO as measuring gas is a sudden pyrolysis in a helium carrier stream at a temperature of 1080°C in the absence of surplus carbon. Results obtained with this method for carbohydrates and some aromatic substances show a very satisfactory agreement with St80 values obtained by the Rittenberg-Ponticorvo method and with known 6 "0 values of standards; the standard deviation observed is usually better than 0.8%. The method is in principle also suitable for nitrogen containing compounds, as it implies a gas chromatographic separation of CO and N,. Long-chained aliphatic alcohols, aldehydes, esters, and some nitrogen containing compounds did not give satisfactory results, probably because of an insufficient CO yield.

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