Abstract
There was a need for stable isotope reference samples other than water for interlaboratory calibration discussion. Two carbon dioxide reference samples, NBS-16 and NBS-17, were prepared for oxygen and carbon stable isotope calibration of mass spectrometers. NBS-16 was prepared from carbon dioxide taken directly from a tank of Air Products liquified carbon dioxide, produced as an industrial byproduct. NBS-17 was prepared from carbon dioxide taken directly from a tank of Chemetron Corp. gaseous carbon dioxide, obtained from a carbon dioxide well in the southwestern United States. This selection ensured that there would be a large difference in carbon and oxygen isotope ratios between the two NBS reference gases. The preparation of several hundred isotopically homogeneous carbon dioxide reference samples proved to be a nontrivial exercise, plus this method can be used to prepare gaseous laboratory reference samples for internal use to keep an accurate check on drift of the working standard. The preparation technique was described in detail. 1 figure, 2 tables.
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