Abstract
This chapter provides an analysis of sulfur isotope ratios by mass-spectrometer for data corrections, in terms of the data measured for the molecular species. The aim of the correction is to remove the effects of oxygen isotope composition to reveal the true sulfur isotope values. To measure accurate isotopic compositions, it is necessary to correct the oxygen isotope contributions to the SO2 mass spectrum. There is a potential need for complicated data reduction because masses 65 and 66 or 49 and 50 have contributions from more than one oxygen isotope. The masses measured depend on the oxygen isotope composition of the SO2 as well as that of the sulfur. The algebraic expressions used to correct measured data is derived and the evaluation of the sensitivity of the final result to uncertainties in the corrections are provided. Practical routine application of the correction procedures in a laboratory comprises internal precision of measurements, minimizing differences in between sample and reference, and isotopic measurements of sulphates.
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