Abundance, geo-microbial role and community diversity of sulfate-reducing bacteria in tropical estuarine sediments

Vincent, Salom Gnana Thanga; Arya, Dennison Bindulekha; Sunil, Syama; Shaji, Panchami; Devi, Aswathy; Sreevalsan, Sreelekshmi; Pulickal, Anand Krishnan

doi:10.1016/j.wsee.2023.06.002

Cited by 1 publication

(2 citation statements)

References 44 publications

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“…For the analysis of elemental concentrations in the water phase, including overlying water and interstitial water, the total dissolved arsenic and manganese contents were measured using an Inductively Coupled Plasma Mass Spectrometer (ICP-MS, Agilent7500cx, Santa Clara, CA, USA) in helium mode to exclude possible interference from 40 Ar and 35 Cl [27]. Internal standards with 115 In and 103 Rh were used to assess the stability of the ICP-MS instrument.…”

Section: Sampling and Analysismentioning

confidence: 99%

“…For example, sulfate-reducing bacteria could convert sulfate into sulfide [39]. In a highly organic-rich reducing environment, the reduction behavior of sulfate-reducing bacteria was enhanced [40]. Under the initial pH 9.5 condition, the microbial activity at the sediment-water interface could be inhibited due to the higher initial pH of the water, which was unfavorable for the generation of dissolved S. As a result, the concentration of dissolved S at the sedimentwater interface (0-−2 cm) only varied within the range of 0.14-0.18 mg/L (Figure 5).…”

Section: Effect Of Initial Ph On Dissolved Fe Mn and S Under Differen...mentioning

confidence: 99%

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The Effects and Mechanisms of pH and Dissolved Oxygen Conditions on the Release of Arsenic at the Sediment–Water Interface in Taihu Lake

Zeng,

Yan,

Yang

et al. 2023

Toxics

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The pH and dissolved oxygen (DO) conditions are important environmental factors that control the migration of arsenic (As) at the sediment–water interface. This study investigates the distribution differences of reactive iron, manganese, and arsenic at the sediment–water interface under anaerobic and aerobic conditions at different pH levels. The strong buffering capacity of sediment to water pH results in a shift towards neutral pH values in the overlying water under different initial pH conditions. The level of DO becomes a key factor in the release of As from sediment, with lower DO environments exhibiting higher release quantities and rates of As compared to high DO environments. Under low DO conditions, the combined effects of ion exchange and anaerobic reduction lead to the most significant release of As, particularly under pH 9.5 conditions. The formation of amorphous ferrous sulfide compounds under low DO conditions is a significant factor contributing to increased arsenic concentration in the interstitial water. Therefore, the re-migration of endogenous arsenic in shallow lake sediments should consider the combined effects of multiple driving forces.

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Section: Sampling and Analysismentioning

confidence: 99%

Section: Effect Of Initial Ph On Dissolved Fe Mn and S Under Differen...mentioning

confidence: 99%

The Effects and Mechanisms of pH and Dissolved Oxygen Conditions on the Release of Arsenic at the Sediment–Water Interface in Taihu Lake

Zeng,

Yan,

Yang

et al. 2023

Toxics

View full text Add to dashboard Cite

show abstract

Abundance, geo-microbial role and community diversity of sulfate-reducing bacteria in tropical estuarine sediments

Cited by 1 publication

References 44 publications

The Effects and Mechanisms of pH and Dissolved Oxygen Conditions on the Release of Arsenic at the Sediment–Water Interface in Taihu Lake

The Effects and Mechanisms of pH and Dissolved Oxygen Conditions on the Release of Arsenic at the Sediment–Water Interface in Taihu Lake

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