The δ34S values of the early-cleaved sulfur upon low temperature pyrolysis of a synthetic polysulfide cross-linked polymer

Alon Amrani, Ward Said-Ahamed, Zeev Aizenshtat*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Closed and open kinetic pyrolysis experiments were conducted at 200°C on synthetic sulfur cross-linked polymer. Sulfur isotopic analyses of the released H2S and the residual organic sulfur revealed large discrimination (6-9.5‰) between the early-formed, isotopically light H2S and the residual organic sulfur. This indicates that there is a relatively large kinetic isotope effect during thermal alteration of organic sulfur. This large discrimination decreases as the reaction time increases. Isotope exchange between organic sulfur and inorganic sulfur species rapidly occur under closed system conditions. Therefore, we suggest that the early isotopic discrimination in closed system is minimized due to both gradual release of heavier sulfur isotope and isotopic exchange processes as the pyrolysis experiments advance. These results have significant geochemical implications for source rock-oil-H2S correlations.

Original languageAmerican English
Pages (from-to)971-974
Number of pages4
JournalOrganic Geochemistry
Volume36
Issue number6
DOIs
StatePublished - Jun 2005

Bibliographical note

Funding Information:
We thank the Israel Academy of Sciences and the Minerva Foundation for the GC-EA -IRMS instrument. Alon Amrani thanks the Rieger Foundation for a Ph.D. study award. We gratefully acknowledge the editorial help and valuable suggestions of Dr. Clifford Walters and an anonymous referee.

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