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On-line δ18O measurement of organic and inorganic substances

✍ Scribed by Barbara E. Kornexl; Matthias Gehre; Reiner Höfling; Roland A. Werner

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
117 KB
Volume
13
Category
Article
ISSN
0951-4198

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✦ Synopsis

A method for the automated sample conversion and on-line oxygen isotope ratio (d 18 O) determination for organic and inorganic substances is presented. The samples are pyrolytically decomposed at 1400 °C in the presence of nickelized graphite. With the system presented organic as well as inorganic samples such as nitrates, sulphates and phosphates of 50-100 mg O can be analyzed for their d 18 O values with a standard deviation usually better than 0.5%. Additionally, carbon isotope ratios of organic substances and nitrogen isotope ratios of inorganic nitrogenous compounds are available in the same sample run. Data for international and some inter-laboratory reference materials are presented to show the accuracy and reliability of the method. The effect of some additives on the CO yield was checked for substances which do not pyrolyze completely.

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