| Autor: |
Mulvaney, R. L., Fohringer, C. L., Bojan, V. J., Michlik, M. M., Herzog, L. F. |
| Předmět: |
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| Zdroj: |
Review of Scientific Instruments; Feb1990, Vol. 61 Issue 2, p897, 7p |
| Abstrakt: |
A sequential sample treatment system is described that permits use of an isotope-ratio mass spectrometer for automated Rittenberg analyses of ammonium salts. This system is based on the design of McInteer and Montoya [Recent Developments in Mass Spectrometry in Biochemistry, Medicine and Environmental Research, edited by A. Frigerio (Elsevier, Amsterdam, 1981), Vol. 7, p. 343]. An x-y table and a set of valves under computer control are used to automatically perform hypobromite oxidations, introduce the N[sub 2] thus liberated to the mass spectrometer for isotope-ratio analysis, and effect spent sample pumpaway. Analyses can be performed on samples containing 20 µg of N. When operated with a Nuclide Model 3-60-RMS double-collector mass spectrometer, the standard deviation for measurements at the natural abundance level (12 samples, 50 or 100 µg of N per sample) ranged from 0.0002 to 0.000 06 at. % [sup 15]N. Throughput capacity is 100-250 samples per day, and unattended operation can continue for at least three days. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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