Preparation of SF 6 for sulfur isotope analysis by laser heating sulfide minerals in the presence of F 2 gas

Details Preparation of SF 6 for sulfur isotope analysis by laser heating sulfide minerals in the presence of F 2 gas Preparation of SF 6 for sulfur isotope analysis by laser heating sulfide minerals in the presence of F 2 gas

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4499r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 18, pp.4499-4512

Computer Science

3

Scientific paper

The feasibility of in-situ fluorination of sulfide minerals for sulfur isotope analyses has been demonstrated. Laser fluorination of powdered samples, previously analyzed by conventional bulk SO 2 or BrF 5 methods, verifies that comparable precision and accuracy can be achieved with the new method. The 34 S CDT and 33 S CDT values of powdered samples are independent of F 2 gas pressure over a range of from 15 to 120 torr. Furthermore, 34 S CDT values are independent of SF 6 yields from 40 to 100% for powders that do not fluorinate spontaneously at room temperature. The precision of replicate analyses of powdered pyrite, troilite, chalcopyrite, sphalerite, galena, acanthite, and greenockite is typically 0.1-0.2 . Interlaboratory comparisons of previously analyzed powders agree as closely as 0.1 and disagree by as much as 0.8 over a range of 34 S CDT from -30 to +34 . The technique of in-situ laser fluorination was validated by comparison of analyses of side-by-side laser craters and powders from drill holes in polished sulfide mineral surfaces. For isotopically homogeneous samples, laser craters and drill hole powders agree within 0.1-0.3 for both 34 S Cdt and 33 S CDT , depending on the mineral analyzed.

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