Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1807h&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 48, Issue 9, p. 1807-1818.
Physics
10
Scientific paper
Analyses of the specific products of 35SO42- reduction measurements were made in marine sediments in Denmark. We injected tracer quantities of 35SO42- into cores, incubated the cores, and assayed for 35S-labelled acid volatile sulfides. Additionally, we assayed for 35S-labelled elemental sulfur by extraction with CS2, and for 35S-labelled pyrite by reduction with chromium (II). We separately determined that elemental sulfur which formed in situ and that which formed by oxidation during the acid distillation of acid volatile sulfides.In subtidal sediments in Limfjorden, 35S-labelled elemental sulfur and pyrite make up 14-32% of the reduced sulfur formed in short-term (0-48 hours) 35SO42- reduction experiments, at all depths studied (0-15 cm). Labelled elemental sulfur which formed in situ during the incubations at depths below 1 cm made up a fairly constant 5-11% of the total labelled reduced sulfur, from 0-1 cm, it made up 27%. An additional small amount (1-2% from 1-15 cm and 5% from 0-1 cm) of labelled elemental sulfur was formed during the acid-distillation step in our assay for labelled acid-volatile sulndes. Pyrite contained 4-13% of the total labelled reduced sulfur at all depths. Rates of sulfate reduction in Limfjorden were linear over the period 0-48 hours, and 35S-pyrite made up a nearly constant percentage of the 35S-labelled reduced sulfur formed over this time period.Estimates of sulfate reduction rates for Limfjorden which do not include elemental sulfur and pyrite as products are 19% too low. At Kysing Fjord, estimates of sulfate reduction which do not include elemental sulfur and pyrite are 24% to 32% too low. Thus, while previously published data on sulfate reduction in similar environments are probably low, they are not greatly in error.
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