Abstract
Data on the vertical distribution of thiosulfate and sulfite by derivatization with monobromobimane in the water column of the Black Sea were obtained for the first time. Thiosulfate and sulfite appeared in detectable quantities below the redox interface along with the appearance of hydrogen sulfide. On the continental slope, the concentration of sulfite reaches 1.12 µM, and that of thiosulfate 0.53 µM in sea water with a potential density of 16.40–16.80 kg/m3. In the deep part of the sea at a depth of 400 m (potential density 16.96 kg/m3), the concentrations of sulfite and thiosulfate reach their maximum values of 1.74 and 0.98 µM, respectively. The comparison of data on thiosulfate obtained after filtration and without filtration showed that in the upper part of the anaerobic layer, up to 100% of thiosulfate is associated with bacterioplankton; its proportion gradually decreases to a depth of 600 m. These data and the correlation with sulfite and particulate organic carbon suggest that, in the upper part of the anaerobic zone, thiosulfate and sulfite obtained as a result of activity of chemoautotrophic bacteria are dominant.
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This work was supported by the Russian Science Foundation, grant no. 23-27-00355, https://rscf.ru/project/23-27-00355.
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Rimskaya-Korsakova, M.N., Dubinin, A.V. Vertical Distribution of Thiosulfate and Sulfite in the Black Sea. Dokl. Earth Sc. 517, 1139–1144 (2024). https://doi.org/10.1134/S1028334X2460172X
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DOI: https://doi.org/10.1134/S1028334X2460172X