ELEMENTAL SULFUR AND ITS ISOTOPIC COMPOSITION IN THE BLACK SEA WATER

A. V. Dubinin; Дубинин А. В.; T. P. Demidova; Демидова Т. П.; L. S. Semilova; Семилова Л. С.; M. N. Rimskaya-Korsakova; Римская-Корсакова М. Н.; E. O. Dubinina; Дубинина Е. О.; S. A. Kossova; Коссова С. А.; E. N. Zologina; Зологина Е. Н.

doi:10.31857/S2686739723600480

ELEMENTAL SULFUR AND ITS ISOTOPIC COMPOSITION IN THE BLACK SEA WATER

Authors: Dubinin A.V.¹, Demidova T.P.¹, Semilova L.S.¹, Rimskaya-Korsakova M.N.¹, Dubinina E.O.², Kossova S.A.², Zologina E.N.¹
Affiliations:
1. Shirshov Institute of Oceanology, Russian Academy of Sciences
2. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences
Issue: Vol 511, No 1 (2023)
Pages: 24-30
Section: GEOCHEMISTRY
Submitted: 14.10.2023
Published: 01.07.2023
URL: https://bakhtiniada.ru/2686-7397/article/view/135799
DOI: https://doi.org/10.31857/S2686739723600480
EDN: https://elibrary.ru/RYSHXL
ID: 135799

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Abstract

As one of the main intermediate products of hydrogen sulfide oxidation, elemental sulfur plays an important indicator role in understanding the oxidative cycle of sulfur in the water of anoxic basins. The distribution of elemental sulfur in the Black Sea water column at stations located in the area of the continental slope is considered. For the first time, the concentration distributions of two forms of elemental sulfur depending on the depth in the Black Sea water were obtained: suspended elemental sulfur with a fraction of more than 0.45 μm (S⁰) and zero valency sulfur (ZVS), which includes the sum of elemental sulfur (suspended and colloidal) and polysulfide sulfur. In the upper anoxic waters, the concentration of S⁰ noticeably increases (almost 200 times relative to the 400 m depth) with an increase in the concentration of hydrogen sulfide and the density of water. At depths of more than 250 m, the concentration of both forms of sulfur remains almost constant (ZVS = 0.21 ± ± 0.03 µmol/kg, S⁰ = 0.05 ± 0.01 µmol/kg). A sharp increase in the concentration of S⁰ at the depths of 150–250 m is associated with the oxidation of hydrogen sulfide due to bacterial anoxygenic photosynthesis after sampling. The value of δ³⁴S(ZVS) was determined in the waters of two stations Ash-26 and 149 at the depths of 450 and 600 m respectively, which turned out to be +2.2‰ higher than δ³⁴S(Н₂S) from the same depths, which indicates the bacterial origin of elemental sulfur.

Keywords

zero valency sulfur, elemental sulfur, hydrogen sulfide, isotopic composition, Black Sea

References

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