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Kamis, 24 Januari 2013

Isotope Dilution Mass Spectrometry

BAM Federal Institute for Materials Research and Testing
Unter den Eichen 87, 12205 Berlin, Germany

IDMS Principle
The principle of IDMS is surprisingly simple. A sample with known isotopic composition of the analyte element, but unknown element content is mixed with a known amount of spike. This spike contains the analyte element in a different isotopic composition: Ideally enriched in the rarest natural isotope. After complete mixing of sample and spike the so-called sample-spike blend or isotope diluted
sample gained a new isotope ratio being between the isotope ratio of the sample and that of the spike. This blend isotope ratio directly reflects the analyte concentration in the sample. The principle is demonstrated  for the example of antimony