Sulfur and Hydrogen Isotope Anomalies in Meteorite Sulfonic Acids-Reference-Cited by-同舟云学术

Sulfur and Hydrogen Isotope Anomalies in Meteorite Sulfonic Acids

Published:1997-08-22 Issue:5329 Volume:277 Page:1072-1074
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Cooper George W.¹²³,Thiemens Mark H.¹²³,Jackson Teresa L.¹²³,Chang Sherwood¹²³

Affiliation:

1. G. W. Cooper, SETI Institute and NASA Ames Research Center, MS 239-4, Moffett Field, CA 94035, USA.

2. S. Chang, NASA Ames Research Center, MS 239-4, Moffett Field, CA 94035, USA.

3. M. H. Thiemens and T. L. Jackson, Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093–0356, USA.

Abstract

Intramolecular carbon, hydrogen, and sulfur isotope ratios were measured on a homologous series of organic sulfonic acids discovered in the Murchison meteorite. Mass-independent sulfur isotope fractionations were observed along with high deuterium/hydrogen ratios. The deuterium enrichments indicate formation of the hydrocarbon portion of these compounds in a low-temperature environment that is consistent with that of interstellar clouds. Sulfur-33 enrichments observed in methanesulfonic acid could have resulted from gas-phase ultraviolet irradiation of a precursor, carbon disulfide. The source of the sulfonic acid precursors may have been the reactive interstellar molecule carbon monosulfide.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference33 articles.

1. J. R. Cronin and S. Chang in Chemistry of Life's Origins J. M. Greenberg V. Pirronello C. Mendoza-Gomez Eds. (Kluwer Dordrecht Netherlands 1993) pp. 209–258.

2. E. F. Van Dishoeck G. A. Blake B. T. Draine J. I. Lunine in Protostars and Planets III E. H. Levy and J. I. Lunine Eds. (Univ. of Arizona Tucson AZ 1993) pp. 163–241.

3. Bunch T. E., Chang S., Geochim. Cosmochim. Acta 44, 1543 (1980).

4. Cooper G. W., Onwo W. M., Cronin J. R., ibid. 56, 4109 (1992).

5. Also see (6). The stable isotopes of S have masses of 32 (95.02%) 33 (0.75%) 34 (4.21%) and 36 (0.02%) atomic mass units (amu). The deviation of the ratio of S isotopes in a sample from the standard (S in the Canyon Diablo iron meteorite) is given in parts per thousand or per mil which is defined as δ x S = {[( x S/ 32 S) sample /( x S/ 32 S) standard ] − 1} × 1000 where x = 33 34 or 36. If plotted on a three-isotope graph normal mass-dependent fractionations should lie on the line δ 33 S = 0.5 δ 34 S because the difference between 33 S and 32 S is 1 amu and the difference between 34 S and 32 S is 2 amu which gives 0.5 as the slope. Similarly δ 36 S = 1.97 δ 34 S. Therefore any mass-independent isotopic anomaly in 33 S and 36 S is given by (in per mil) 33 Δ = δ 33 S − 0.5 δ 34 S and 36 Δ = δ 36 S − 1.97 δ 34 S respectively. All known terrestrial S lies on normal mass-dependent fractionation lines. The calculation of δ values for C and H is similar to that of S that is δH = {[( H/L ) sample /( H/L ) standard ]−1} × 1000 where H and L are the heavy and light isotopes respectively of each element.

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