Reduced inorganic sulfur in surface sediment and its impact on benthic environments in offshore areas of NE China

Sheng, Yanqing; Sun, Qiyao; Bottrell, Simon H.; Mortimer, Robert J.G.

doi:10.1039/c5em00175g

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…It is worth noting that pyrite-Fe in the BHS surface sediments was not measured because it is usually fairly low and only accounts for a minor share of Fe HR in surface marine sediments underlying oxic bottom waters. For example, pyrite-Fe contents in surface sediments of the BHS and SYS previously reported by Sheng et al (2015) were 1.80 ± 1.1 and 2.84 ± 2.11 μmol/g, respectively, accounting for only 1.2% and 3.4% of Fe HR in the BHS and SYS, respectively (see Table 2). Therefore, an exclusion of pyrite-Fe has almost no influence on the quantity of Fe HR pool in surface sediments of the two seas.…”

Section: Iron Speciationmentioning

confidence: 77%

Reactive Iron and Iron‐Bound Organic Carbon in Surface Sediments of the River‐Dominated Bohai Sea (China) Versus the Southern Yellow Sea

et al. 2019

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Factors influencing reactive Fe cycling and its protection of organic carbon (OC) in sediments are poorly understood. Here we comparatively study Fe speciation and Fe‐associated OC (Fe‐OC) in surface sediments of the Bohai Sea (BHS) and southern Yellow Sea (SYS), two seas with common sediment sources but different depositional regimes. Though significant sequestration of highly reactive Fe (FeHR) is expected in the estuarine system stream from the river‐dominated BHS, this pool is, however, slightly enriched in the BHS sediments relative to their source material. This reconfirms a previous speculation of sedimentary FeHR enrichment in semi‐protected settings. Relative to the BHS, the SYS sediments are depleted of FeHR, despite common sediment sources of these two areas. Estuarine pre‐enrichment and subsequent redistribution of FeHR in the BHS, and aging of Fe‐bearing authigenic clays during transport from the BHS to the SYS are potential mechanisms for the depletion. The fractions (fFe‐OC) of Fe‐OC in total OC in sediments of the two seas are at the lower end for soils and sediments, indicating Fe being a minor “rusty sink.” 13CFe‐OC fractionations indicate preferential sequestration of terrestrial OC by Fe oxides in the BHS, in contrast with preferential retention of marine OC in the SYS. Different fractionations of 13CFe‐OC in the two seas are a net result of selective adsorption of OC by Fe oxides and selective stabilization of OC during Fe reductive dissolution. Preferential sequestration of terrestrial OC may exert an important influence on distribution and compositions of OC buried in the river‐dominated system.

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Section: Iron Speciationmentioning

confidence: 77%

Reactive Iron and Iron‐Bound Organic Carbon in Surface Sediments of the River‐Dominated Bohai Sea (China) Versus the Southern Yellow Sea

et al. 2019

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“…When the salinity increased, the product of sulfate reduction, that is, ∑H 2 S, accumulated (Burton et al., 2008). Fe(III) could be abiotically reduced by ∑H 2 S and yield FeS (Mohatt et al., 2011; Sheng et al., 2015). This abiotic Fe(III) reduction has larger reaction kinetics than microbial Fe(III) reduction and thus could compete for Fe(III) with microbial Fe(III) reduction (Kappler et al., 2021; Luo et al., 2015).…”

Section: Discussionmentioning

confidence: 99%

Iron Reduction Controls Carbon Mineralization in Aquaculture Shrimp Pond Sediments in Subtropical Estuaries

et al. 2022

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Global aquaculture production has increased by 500% since the late 1980s to address the growing demand for aquatic proteins and decreasing fishery resources in natural aquatic ecosystems (FAO, 2016). More than 40% of global aquaculture production is carried out in earthen aquaculture ponds (Yuan et al., 2019). A total volume of 101 million tons of aquaculture was produced in 2014, and this volume is expected to continuously increase to 230 million tons in the next 20 years (FAO, 2014). Such huge increases in aquatic production depend heavily on

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“…Reduced inorganic sulfur (RIS) pools were determined using a slight modification of the sequential extraction method of Sheng et al (2015), as described by Newton et al (1995) and Hsieh and Shieh (1997). The RIS was divided into acid-volatile sulfide (AVS; 6 mol L −1 HCl, 1 h), chromium-reducible sulfide (CRS or pyrite-S; 15 mL acidic Cr 2+ , 2 h), and elemental sulfur (ES; 5 mL Cr 2+ + 20 mL N,N-dimethylformamide (DMF) + 5 mL concentrated HCl, 1 h).…”

Section: Chemical Analysismentioning

confidence: 99%

Redox-dependent phosphorus burial and regeneration in an offshore sulfidic sediment core in North Yellow Sea, China

Zhao

Sheng

Jiang

et al. 2019

Marine Pollution Bulletin

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Phosphorus (P) pollution can trigger severe marine eutrophication, which further leads to harmful algal blooms, and a deterioration of sea water quality. The P burial and regeneration in offshore sediments can directly affect the eutrophication levels of estuarine and coastal ecosystems. Although many researches on redox-dependent P burial and regeneration were studied, such process in the presence of silicate is still poorly understood, and the effects of pyrite formation on organic P (OP) burial and regeneration also remain unclear. In this study, a sulfidic sediment core was collected in the offshore of an estuary in the north Yellow Sea, China. Results indicated that indigenous biological input was found to be the primary source of organic matter in upper sediments. The regenerated P under reducing conditions was dominated by labile FeeP and OP. The PO 4 3− released from FeeP and OP that could be captured by Al/Fe/Mn (oxyhydr) oxides in surface sediments and Ca minerals in deep sediments. CaeP, AleP, unreactive Al/Fe-Si-P and some stable metal chelated OP were the main burial P fractions. Sulfate reduction and formation of insoluble metal sulfides including the pyrite promoted OP decomposition by anaerobic decomposition, removing metal ions from the "metal-OP" chelates and restoring the phosphatase activity.

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Reduced inorganic sulfur in surface sediment and its impact on benthic environments in offshore areas of NE China

Abstract: Geochemical cycling and biological toxicity of sulfur in marine sediments is closely related to the activity of organisms.

Cited by 6 publications

References 47 publications

Reactive Iron and Iron‐Bound Organic Carbon in Surface Sediments of the River‐Dominated Bohai Sea (China) Versus the Southern Yellow Sea

Reactive Iron and Iron‐Bound Organic Carbon in Surface Sediments of the River‐Dominated Bohai Sea (China) Versus the Southern Yellow Sea

Iron Reduction Controls Carbon Mineralization in Aquaculture Shrimp Pond Sediments in Subtropical Estuaries

Redox-dependent phosphorus burial and regeneration in an offshore sulfidic sediment core in North Yellow Sea, China

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