Vertical distribution of thiosulfate and sulfite in the Black Sea

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Abstract

We obtained the data on the vertical distribution of thiosulfate and sulfite by derivatization with monobromobimane in the water column of the Black Sea 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 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 of 1.74 µM and 0.98 µM, respectively. A comparison of data on thiosulfate obtained after filtration and without filtration showed that in the upper part of the anoxic layer, up to 100% of thiosulfate is associated with bacterioplankton. Microbial bound thiosulfate in the cell 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 anoxic zone, thiosulfate and sulfite are predominantly a result of the activity of chemoautotrophic bacteria.

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About the authors

M. N. Rimskaya-Korsakova

Shirshov Institute оf Oceanology, Russian Academy of Sciences

Author for correspondence.
Email: korsakova@ocean.ru
Russian Federation, Moscow

A. V. Dubinin

Shirshov Institute оf Oceanology, Russian Academy of Sciences

Email: korsakova@ocean.ru
Russian Federation, Moscow

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2. Fig. 1. Distribution of hydrogen sulfide, oxygen, thiosulfate and sulfite with depth in the Black Sea at station Ashamba-28 (13.07.2022) (a) and at station 237 (04.10.2022) (b).

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3. Fig. 2. Distribution of Mn+3 (1), Mn+4 (2), Fe+3 (3), thiosulfate (derivatization with MBB) (4) and thiosulfate (derivatization with DTNP) (5) depending on σθ. The shaded area is the maximum concentrations from 12.07.2018 and the minimum from 07.07.2021 over 4 years of research at the Ashamba series stations [ ]. The dotted line shows the redox interface (σθ 16.20 kg/m3). Manganese and thiosulfate (DTNP) from [ ], data on Fe were obtained at the Ashamba-27 station (11.07.2022).

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4. Fig. 3. Changes in the concentrations of suspended organic carbon (1), thiosulfate (×10) (2) and sulfite (×5) (3). The dotted line shows the redox interface (σθ 16.20 kg/m3). The data for POC were obtained at the Ashamba-21 station (20.07.2020).

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