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General equation for multiple spiking isotope dilution mass spectrometry
Laurent Ouerdane1, Zoltán Mester, Juris Meija
1Institute for National Measurement Standards, National Research Council Canada 1200 Montreal Rd., Ottawa ON K1A 0R6, Canada. laurent.ouerdane@univ-pau.fr
Analytical Chemistry
|May 22, 2009
Summary
A new general equation for isotope dilution mass spectrometry was developed. This primary ratio method provides accurate quantitative analysis, especially for complex samples like methylmercury and chromium(VI).
Area of Science:
- Analytical Chemistry
- Metrology
- Mass Spectrometry
Background:
- Isotope dilution (ID) is a primary ratio method for quantitative analysis, yielding high-quality metrological results.
- Existing ID equations have been used for over 50 years, with extensions to correct for analyte formation.
- Challenges arise in analyzing substances like methylmercury or chromium(VI) due to complex variables.
Purpose of the Study:
- To address the limitations of current isotope dilution equations.
- To propose a single, comprehensive master equation for isotope dilution analysis.
- To account for various factors including analyte formation and mass spectral data.
Main Methods:
- Development of a generalized isotope dilution equation.
- Consideration of analyte formation during analysis.
- Inclusion of variables such as isotope number, substance number, and mass spectra type.
Main Results:
- A novel, general equation for isotope dilution has been formulated.
- The proposed equation aims to encompass all relevant variables for accurate analysis.
- This provides a unified approach for complex quantitative measurements.
Conclusions:
- The proposed general equation offers a significant advancement in isotope dilution methodology.
- It provides a robust framework for accurate quantitative analysis across diverse analytes.
- This work simplifies and enhances the application of isotope dilution in analytical chemistry.
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