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On‐line δ 18 O measurement of organic and inorganic substances
Author(s) -
Kornexl Barbara E.,
Gehre Matthias,
Höfling Reiner,
Werner Roland A.
Publication year - 1999
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(19990830)13:16<1685::aid-rcm699>3.0.co;2-9
Subject(s) - chemistry , yield (engineering) , nitrogen , stable isotope ratio , isotope , analytical chemistry (journal) , environmental chemistry , inorganic chemistry , organic chemistry , materials science , physics , quantum mechanics , metallurgy
A method for the automated sample conversion and on‐line oxygen isotope ratio (δ 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 µg O can be analyzed for their δ 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. Copyright © 1999 John Wiley & Sons, Ltd.