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Environmental Impact Assessment by Marine Cage Fish Farms: II. Estimation of Hydrogen Sulfide Oxidation Rate at $O_2$-H$_2$S Interface and Sulfate Reduction Rate in Anoxic Sediment Layer  

Lee, Jae-Seong (Research Management Division, NFRDI)
Kim, Kee-Hyun (Department of Oceanography, Chungnam National University)
Yu, Jun (South Sea Fisheries Research Institute, NFRDI)
Lee, Pil-Yong (South Sea Fisheries Research Institute, NFRDI)
Jung, Rae-Hong (Marine Environment Management Team, NFRDI)
Lee, Wong-Chan (Research Management Division, NFRDI)
Han, Jung-Jee (Isotope Research Team, Korea Basic Science Institute)
Lee, Yong-Hwa (South Sea Fisheries Research Institute, NFRDI)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.9, no.2, 2004 , pp. 64-72 More about this Journal
Abstract
We measured the vertical profiles of $O_2$, H$_2$S, and pH in sediment pore water beneath marine cage fish farms using a microsensor with a 25 ${\mu}{\textrm}{m}$ sensor tip size. The sediments are characterized by high organic material load. The oxygen consumption, hydrogen sulfide oxidation, and sulfate reduction rates in the microzonations (derived from the vertical distribution of chemical species concentration) were estimated by adapting a simple one-dimensional diffusion-reaction model. The oxygen penetration depth was 0.75 mm. The oxic microzonations were divided into upper and lower layers. Due to hydrogen sulfide oxidation within the oxic zone, the oxygen consumption rate was higher in the lower layer. The total oxygen consumption rate integrated with reaction zone depth was estimated to be 0.092 $\mu$mol $O_2$cm$^{-2}$ hr$^{-1}$ . The total hydrogen sulfide oxidation rate occurring within 0.7 mm thickness was estimated to be 0.030 $\mu$mo1 H$_2$S cm$^{-2}$ hr$^{-1}$ , and its turnover time in the oxic sediment layer was estimated to be about 2 minutes. This suggests that hydrogen sulfide was oxidized by both chemical and microbial processes in this zone. The molar consumption ratio, calculated to be 0.84, indicates that either other electron accepters exit on hydrogen sulfide oxidation, or elemental sulfur precipitation occurs near the $O_2$- H$_2$S interface. Total sulfate reduction flux was estimated to be 0.029 $\mu$mol cm$^{-2}$ hr$^{-1}$ , which accounted for more than 60% of total $O_2$ consumption flux. This result implied that the degradation of organic matter in the anoxic layer was larger than in the oxic layer.
Keywords
early diagenesis; hydrogen sulfide oxidation; sulfate reduction; microsensor; organic matter degradation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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