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- W2030404132 abstract "35S-labeled SO42−, S2O32−, S0, ΣHS− (=H2S + HS− + S2−), and FeS2 were used to trace the oxidative and reductive pathways of the sulfur cycle. We studied the transformation of 35SO42−, 35S2O3−, 35S0, AV35S ( =ΣH35S− + Fe35S), and Fe35S2 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 35S from 35SO22− reduction was recovered as 35S0g in the top two cm of the sediment. At >2 cm, nearly all of the reduced 35SO42− was recovered as AV35S plus Fe35S2. Thiosulfate was not detected in the sediment. From the combined data of outer- and inner-labeled 35S2O32− injections, concurrent oxidation, reduction, and disproportionation of S2O32− were demonstrated. In oxidized surface sediment the three processes comprised 10, 24, and 66%, respectively, of the metabolized 35S2O32−. In reduced sediment these percentages were 16, 45, and 39%. Injections of SH35S− into S2O32− spiked sediment cores produced 71% 35SO42− and 29%35S2O32− (% of the total 35SO42− + 35S2O32− in the oxidized zone and 8% 35SO42− and 92% 35S2O32− in the reduced zone. A similar experiment with 35S0 produced 62% 35SO42− and 38% 35S2O32− in the oxidized zone and 22 and 78% in the reduced zone. We calculated that more than half of the 35S0 and ΣH35S− oxidation to SO42− proceeded through S2O32− in the reduced sediment. In the oxidized sediment these percentages were 15 and 21% for SH35S− and 35S0, respectively. Thiosulfate was thus a key intermediate in the S cycle." @default.
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- W2030404132 date "1990-10-01" @default.
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- W2030404132 title "Oxidation and reduction of radiolabeled inorganic sulfur compounds in an estuarine sediment, Kysing Fjord, Denmark" @default.
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- W2030404132 doi "https://doi.org/10.1016/0016-7037(90)90008-9" @default.
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