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Precise and traceable (13)C/(12)C isotope amount ratios by multicollector ICPMS.

Rebeca Santamaria-Fernandez¹, David Carter, Ruth Hearn

¹LGC, Queens Road, Teddington, Middlesex, TW11 0LY, UK. rsf@lgc.co.uk

Analytical Chemistry

|June 21, 2008

Summary

A new method uses multicollector inductively coupled mass spectrometry (MC-ICPMS) for precise SI-traceable carbon isotope measurements. This technique simplifies sample preparation and offers accurate analysis of carbon isotope ratios in diverse materials.

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Area of Science:

Analytical Chemistry
Geochemistry
Environmental Science

Background:

Accurate measurement of carbon isotope amount ratios is crucial for various scientific disciplines.
Existing methods, like gas source isotope ratio mass spectrometry, can be complex and require extensive sample preparation.
The need for a simpler, more direct method for SI-traceable carbon isotope analysis is evident.

Purpose of the Study:

To introduce and validate a novel method for measuring SI-traceable carbon isotope amount ratios using multicollector inductively coupled mass spectrometry (MC-ICPMS).
To demonstrate the accuracy and reliability of the MC-ICPMS method across a range of carbon isotope ratios.
To highlight the advantages of the new method over conventional techniques.

Main Methods:

Utilized multicollector inductively coupled mass spectrometry (MC-ICPMS) for carbon isotope ratio measurements.
Employed internal normalization using boron (11)B/(10)B isotope ratios to correct for instrumental mass bias.
Calculated full uncertainty budgets using the Kragten approach for absolute ratio determination.

Main Results:

Successfully measured carbon (13)C/(12)C isotope amount ratios for four NIST reference materials with high accuracy (0.06-0.20% deviation from reference values).
Achieved excellent linearity (R = 0.9997) across the measured range, suitable for natural variations in carbon compounds.
Demonstrated excellent agreement with conventional dual inlet isotope ratio mass spectrometry (IRMS) measurements for a CO2 gas sample.

Conclusions:

The developed MC-ICPMS method provides accurate, SI-traceable carbon isotope amount ratios with uncertainties < 0.1%.
The method simplifies sample preparation by allowing direct measurement of organic compounds without derivatization or combustion.
This novel technique offers a versatile and efficient approach for analyzing carbon isotope ratios in a wide array of samples.