Resumption of hydrogen sulfide contamination of the water column of deep basins in the Caspian Sea

Ivanov, Mikhail; Savvichev, Alexander S; Klyuvitkin, А. А.; Chul’tsova, A. L.; Zakharova, E. E.; Rusanov, Igor I; Lein, Alla Yu; Lisitsyn, A. P.

doi:10.1134/s1028334x13110020

Cited by 20 publications

(12 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Despite the differences in hydrochemical conditions, in particular, the content of nutrients and organic carbon, changes in water temperature and depth [12], differences in the number of bacterial communities were small. It is likely that the growth of the hydrogen sulfide layer could affect the number of facultative anaerobic bacteria in the deep-water area of the surveyed water area [12,13]. The species composition of the bacterioplankton of the Caspian Sea was quite stable throughout the entire period of research.…”

Section: Discussionmentioning

confidence: 99%

Current State of Heterotrophic Bacterioplankton and Bacteriobenthos in the Northern and Middle Parts of the Caspian Sea

Dyakova¹,

Volodina²,

Galyautdinova³

et al. 2020

KLS

View full text Add to dashboard Cite

Data on the abundance of heterotrophic bacterioplankton and bacteriobenthos in the northern and middle parts of the Caspian during the period from 2013 to 2017 are presented. In the waters of the northern part of the Caspian, a peak in the number of saprotrophs and crude oil degraders was recorded in 2013. In the middle part of the Caspian and in the region of the Mangyshlak regression, high numbers of heterotrophic bacteria were recorded in 2013 and 2016. The biodiversity of bacterioplankton in the surveyed areas is almost the same; the species composition of saprotrophs and crude oil degraders is identical. In the bottom sediments of the northern and middle parts of the Caspian Sea, two peaks of saprotrophic bacteriobenthos development (in 2013 and 2016) were recorded; in the region of the Mangyshlak threshold, the concentration of saprotrophs remained stable. The number of crude oil degraders was inferior to those of saprotrophs, while the proportion of crude oil degraders to saprotrophs changed annually. The species composition of saprotrophs is relatively stable, the biodiversity of oil-oxidizing bacteriobenthos has changed in the direction of increasing the proportion of non-fermenting bacteria. Constant changes in the ratio of the number of saprotrophs and crude oil degraders, together with the transformations of the dominant groups of the species composition of bacteria, indicated the instability of bacteriobenthos, and, as a result, the vulnerability of the microecosystem of bottom sediments under changing environmental conditions.

show abstract

Section: Discussionmentioning

confidence: 99%

Current State of Heterotrophic Bacterioplankton and Bacteriobenthos in the Northern and Middle Parts of the Caspian Sea

Dyakova¹,

Volodina²,

Galyautdinova³

et al. 2020

KLS

View full text Add to dashboard Cite

show abstract

“…The concentration of hydrogen sulfide increased from the upper bound of its detection layer to the bottom layers of the water column (from 60 to 240 l L −1 , respectively) ( Figure 1b). Active processes of bacterial sulfate reduction were also recorded in the surface sediments (depth 0-1.5 cm) [Ivanov et al, 2013]. Hydrogen sulfide contamination was ob- Figure 1.…”

Section: Es6003mentioning

confidence: 97%

“…It is important to note that since 1930 the unstable presence of hydrogen sulfide was recorded in bottom waters in the Southern Caspian [Ambrosimov et al, 2014;Ivanov et al, 2013;Sapozhnikov et al, 2007]. The first data on the presence of small concentration of hydrogen sulfide were recorded in 1933-1934[Bruevich, 1937.…”

Section: Es6003mentioning

confidence: 99%

“…Complex studies of changes in the hydrochemical regime were carried out in 1958-1962. In the South Caspian Basin, in the near-bottom horizons of the water column, a sharp increase in the oxygen content and complete absence of hydrogen sulfide were observed [Ivanov et al, 2013]. Regular monitoring studies of the Caspian Sea were renewed by VNIRO scientist in 1995.…”

Section: Es6003mentioning

confidence: 99%

“…Hydrogen sulfide contamination was ob- Figure 1. Research area, hydrophysical and hydrochemical characteristics of the Caspian Sea: a) -map-scheme of the research area and the location of the sampling Station 3916; b) -CTD-profiles of distribution of temperature ( ), salinity ( ), conventional density ( ), and oxygen (O 2 ) in the water column of Station 3916 [Ivanov et al, 2013]; c) -evolution of the level of the Caspian Sea in the 20th century in relation to the level of the World Ocean [Lebedev, 2005]. served against the background of significant sea level fluctuations (Figure 1c), which were associated with both climatic changes and the influence of the anthropogenic factor [Ivanov et al, 2013].…”

Section: Es6003mentioning

confidence: 99%

See 2 more Smart Citations

Framboidal pyrite formation in the bottom sediments of the South Caspian Basin under conditions of hydrogen sulfide contamination

Kozina¹,

Reykhard²,

Dara³

et al. 2018

Russ. J. Earth Sci.

View full text Add to dashboard Cite

Structural features and distribution of framboidal pyrite were studied during lithological, mineralogical and geochemical studies of sediments in the South Caspian Basin. The lithological and geochemical parameters affecting the intensity of the formation of authigenic pyrite in sediments of the South Caspian Basin under conditions of hydrogen sulfide contamination were determined. According to X-ray diffraction (XRD), the content of pyrite in pelitic ooze reaches 4%. Microscopic studies have shown that pyrite formation occurs intensively in sediments with a high content of biogenic mineral components, such as opal diatom frustules and calcite plates of coccolithophores. Scanning electron microscopy (SEM) has demonstrated the presence of spherical pyrite framboids, as well as individual pyrite crystallites and their disordered clusters of various shapes. The diameter of the framboids varies from 3 to 10 microns. Pyrite crystallites have subspherical, complicated polyhedral, prismatic, octahedral, pentagonal dodekahedron shapes. The crystallite sizes range from 0.5 to 3 microns. Based on geochemical data, there is no direct correlation between the intensity of pyrite formation and the high content of such components as Fe and C org in bottom sediments. We assume that the formation of authigenic framboid pyrite in surface sediments (including the fluffy layer) is most likely due to the presence of hydrogen sulfide contamination in the near bottom water of the South Caspian Basin. Framboidal pyrite in the deeper layers (up to a depth of 35 cm) is the result of diagenetic processes that occur in accordance with the classical scheme of vertical zonality of diagenetic transformations in sediments.

show abstract

Overview of hydrogen energy production in the Black Sea for the disposal of potentially hazardous hydrogen sulfide

Gunes-Durak,

Kapkin

2024

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Resumption of hydrogen sulfide contamination of the water column of deep basins in the Caspian Sea

Cited by 20 publications

References 2 publications

Current State of Heterotrophic Bacterioplankton and Bacteriobenthos in the Northern and Middle Parts of the Caspian Sea

Current State of Heterotrophic Bacterioplankton and Bacteriobenthos in the Northern and Middle Parts of the Caspian Sea

Framboidal pyrite formation in the bottom sediments of the South Caspian Basin under conditions of hydrogen sulfide contamination

Overview of hydrogen energy production in the Black Sea for the disposal of potentially hazardous hydrogen sulfide

Contact Info

Product

Resources

About