Methodology: Lead Isotope Analysis

Pretreatment

Separation of lead isotopes from the matrix elements is conducted by means of extraction chromatography using Eichrom cation exchange resin following the methods of Pourmand and Dauphas (2010).

Sample types available for lead analysis: bone, igneous rock, marine sediments, lacustrine sediments, metal artifacts / coins, mineral dust, soil, tooth enamel and water. 

More information on Sample Types and Selection for lead analysis

Isotope Measurement

Device: Neptune Plus multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS) with an Apex-Q desolvation nebulizer 

Results

Lead isotope ratio data are reported as 206Pb/204Pb, 207Pb/204Pb, 208Pb/204Pb, 208Pb/206Pb, and 207Pb/206Pb ratios. Uncertainties for each sample measurement is presented as the 95% confidence interval (CI). Presented graphically on a plot which includes representative ranges of the lead isotopic ratios of various materials.

Pb results

Pb isotope results

Plot of  207Pb/206Pb versus 208Pb/206Pb for the tested samples.

References

Pourmand, A. and Dauphas, N., (2010). Distribution coefficients of 60 elements on TODGA resin: application to Ca, Lu, Hf, U and Th isotope geochemistry. Talanta, 81(3), pp.741-753. DOI: 10.1016/j.talanta.2010.01.008