Oxidation and reduction of radiolabeled inorganic sulfur compounds in an estuarine sediment, Kysing Fjord, Denmark

Details Oxidation and reduction of radiolabeled inorganic sulfur compounds in an estuarine sediment, Kysing Fjord, Denmark Oxidation and reduction of radiolabeled inorganic sulfur compounds in an estuarine sediment, Kysing Fjord, Denmark

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2731f&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 10, pp.2731-2742

Computer Science

6

Scientific paper

35 S-labeled SO 4 2- , S 2 O 3 2- , S 0 , HS - (=H 2 S + HS - + S 2- ), and FeS 2 were used to trace the oxidative and reductive pathways of the sulfur cycle. We studied the transformation of 35 SO 4 2- , 35 S 2 O 3 - , 35 S 0 , AV 35 S ( = H 35 S - + Fe 35 S), and Fe 35 S 2 in 8-cm long undisturbed estuarine sediment cores in time course experiments of up to 24 h. All the tracers, except for pyrite, were oxidized and/or reduced at all depths. More than 60% of the 35 S from 35 SO 2 2- reduction was recovered as 35 S 0 g in the top two cm of the sediment. At >2 cm, nearly all of the reduced 35 SO 4 2- was recovered as AV 35 S plus Fe 35 S 2 . Thiosulfate was not detected in the sediment. From the combined data of outer- and inner-labeled 35 S 2 O 3 2- injections, concurrent oxidation, reduction, and disproportionation of S 2 O 3 2- were demonstrated. In oxidized surface sediment the three processes comprised 10, 24, and 66%, respectively, of the metabolized 35 S 2 O 3 2- . In reduced sediment these percentages were 16, 45, and 39%. Injections of SH 35 S - into S 2 O 3 2- spiked sediment cores produced 71% 35 SO 4 2- and 29% 35 S 2 O 3 2- (% of the total 35 SO 4 2- + 35 S 2 O 3 2- in the oxidized zone and 8% 35 SO 4 2- and 92% 35 S 2 O 3 2- in the reduced zone. A similar experiment with 35 S 0 produced 62% 35 SO 4 2- and 38% 35 S 2 O 3 2- in the oxidized zone and 22 and 78% in the reduced zone. We calculated that more than half of the 35 S 0 and H 35 S - oxidation to SO 4 2- proceeded through S 2 O 3 2- in the reduced sediment. In the oxidized sediment these percentages were 15 and 21% for SH 35 S - and 35 S 0 , respectively. Thiosulfate was thus a key intermediate in the S cycle.

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