Environmental and fuel materials analyses by multi-element isotope dilution spark-source mass spectrometry

The isotope dilution method of analysis was expanded to allow the addition of twenty or more enriched stable isotopes to a single sample. The method combines the survey capability of spark-source mass spectrometry with the accuracy and precision of isotope dilution techniques. The limit on the precision of analysis may well be the variability in response of the Ilford QII emulsion. The method was studied using National Bureau of Standards reference materials in order to determine the accuracy and precision of the method. The method was used to measure impurities in a variety of environmental samples at several concentration ranges. A microphotometer was interfaced with a mini-computer to permit rapid collection of data and subsequent concentration determinations. The data system and its operation will be discussed briefly. (U.S.)