Reactive iron and its buffering capacity towards dissolved sulfide in sediments of Jiaozhou Bay, China

Zhu, Mao‐Xu; Liu, Juan; Yang, Gui‐Peng; Li, Tie; Yang, Rujun

doi:10.1016/j.marenvres.2012.06.010

Cited by 36 publications

(28 citation statements)

References 59 publications

(98 reference statements)

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“…In the marine sediments, TOC contents varied between 0.65 and 1.97 % dry weight, with an average of 1.27 % (Table 2), higher than that previously reported at a nearby site (0.87 %) (Zhu et al 2012). TN content ranged from 0.01 to 0.07 % dry weight, with an average of 0.04 %.…”

Section: Distributions Of Toc Tn and Ts In Surface Sedimentmentioning

confidence: 60%

Geochemistry of reduced inorganic sulfur, reactive iron, and organic carbon in fluvial and marine surface sediment in the Laizhou Bay region, China

et al. 2015

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Understanding the geochemical cycling of sulfur in sediments is important because it can have implications for both modern environments (e.g., deterioration of water quality) and interpretation of the ancient past (e.g., sediment C/S ratios can be used as indicators of palaeodepositional environment). This study investigates the geochemical characteristics of sulfur, iron, and organic carbon in fluvial and coastal surface sediments of the Laizhou Bay region, China. A total of 63 sediment samples were taken across the whole Laizhou Bay marine region and the 14 major tidal rivers draining into it. Acid volatile sulfur, chromium (II)-reducible sulfur and elemental sulfur, total organic carbon, and total nitrogen were present in higher concentrations in the fluvial sediment than in the marine sediment of Laizhou Bay. The composition of reduced inorganic sulfur in surface sediments was dominated by acid volatile sulfur and chromium (II)-reducible sulfur. In fluvial sediments, sulfate reduction and formation of reduced inorganic sulfur were controlled by TOC and reactive iron synchronously. High C/S ratios in the marine sediments indicate that the diagenetic processes in Laizhou Bay have been affected by rapid deposition of sediment from the Yellow River in recent decades.

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Section: Distributions Of Toc Tn and Ts In Surface Sedimentmentioning

confidence: 60%

Geochemistry of reduced inorganic sulfur, reactive iron, and organic carbon in fluvial and marine surface sediment in the Laizhou Bay region, China

et al. 2015

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“…1). This study area has been described in detail elsewhere (Zhu et al, 2012a), and thus only some important aspects are presented here as required for later discussion. Among~10 main rivers flowing into Jiaozhou Bay, some in the eastern coast, particularly Haibo River and Licun River, have become the conduits of industrial and domestic wastewater discharges due to the region's rapid economic development and population growth (Dai et al, 2007;Deng et al, 2010;Liu et al, 2010), whereas the rivers discharging into the (north)western parts of the bay (i.e., Dagu River and Yanghe River) have been much less polluted in terms of heavy metal levels .…”

Section: Study Area and Samplingmentioning

confidence: 99%

“…1). This surface layer (0e4 cm) which receives direct sedimentation is involved in active Fe cycling (Zhu et al, 2012a), which allows us to reveal variations of Fe diagenesis in the uppermost layer exposed to varying depositional settings. Upon retrieval of a box core at each station, surface sediments were collected and sealed in zip-lock plastic bags leaving no headspace and then covered with ice.…”

Section: Study Area and Samplingmentioning

confidence: 99%

Iron geochemistry in surface sediments of a temperate semi-enclosed bay, North China

Zhu

Huang

Yang

et al. 2015

Estuarine, Coastal and Shelf Science

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“…The decrease of Fe(II) in the porewaters at depths >35 mm is the result of sulfate reduction which subsequently causes the precipitation of iron-sulfides 46,47 . Dissolved Mn continued to increase, peaking at 60 mm depth, which was also the depth at which the Fe(II) decreased to concentrations similar to those at the SWI.…”

Section: Silver Iron and Manganese Chemistry In Freshwater Sedimentmentioning

confidence: 99%

In Situ Chemical Transformations of Silver Nanoparticles along the Water–Sediment Continuum

Khaksar

Jolley

Sekine

et al. 2014

Environ. Sci. Technol.

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(2015). In situ chemical transformations of silver nanoparticles along the water-sediment continuum. Environmental Science and Technology (Washington), 49 (1), 318-325. In situ chemical transformations of silver nanoparticles along the watersediment continuum AbstractIn order to accurately assess the potential environmental risk posed by silver nanoparticles (Ag-NPs), their transformation and fate must be investigated in natural systems. This has proven to be very challenging due to the difficulties encountered in retrieving/analyzing NPs dispersed in complex and heterogeneous environmental matrices at relevant (i.e., low) concentrations. In this study, we overcame this challenge by immobilizing functionalized Ag-NPs onto plasma polymerized solid substrates to form "nano in situ deployment devices" (nIDDs). This method allowed us to retrieve and analyze the Ag-NPs after 48 h of direct exposure in freshwater-sediment and saltwater-sediment environments. The type and extent of Ag-NPs transformation was expected to vary along the water-sediment continuum as sediments typically contain steep gradients in solute concentrations and redox potential. To trace the distribution of redox sensitive elements (e.g., Fe, Mn), Diffusive Equilibration in Thin-films (DET) devices were inserted into the sediments alongside the nIDDs. Chemical transformation of the immobilized Ag-NPs across the water-sediment continuum was investigated after retrieval by synchrotron radiation X-ray Absorption Spectroscopy. Linear combination fitting of Ag K-edge X-ray absorption spectra indicated that the chemical transformations of Ag-NPs in both freshwater and saltwater sediments were strongly affected by the redox conditions over the investigated range. Silver bound to reduced sulfur was the principal product of Ag-NP transformations but different extents of transformation were observed for Ag-NPs exposed to different depths in the sediment. These field results add important insights about the transformation of Ag-NPs in heterogeneous environments. AbstractIn order to accurately assess the potential environmental risk posed by silver nanoparticles (Ag-NPs), their transformation and fate must be investigated in natural systems. This has proven to be very challenging due to the difficulties encountered in retrieving/analysing NPs dispersed in complex and heterogeneous environmental matrices at relevant (i.e. low) concentrations. In this study, we overcame this challenge by immobilising functionalised Ag-NPs onto plasma polymerised solid substrates to form 'nano in situ deployment devices' (nIDDs). This method allowed us to retrieve and analyze the Ag-NPs after 48h of direct exposure in freshwater-sediment and saltwater-sediment environments. The type and extent of Ag-NPs transformation was expected to vary along the watersediment continuum as sediments typically contain steep gradients in solute concentrations and redox potential. To trace the distribution of redox sensitive elements (e.g. Fe, Mn), Diffusive Equilibration in Thin-films (DET)...

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Reactive iron and its buffering capacity towards dissolved sulfide in sediments of Jiaozhou Bay, China

Cited by 36 publications

References 59 publications

Geochemistry of reduced inorganic sulfur, reactive iron, and organic carbon in fluvial and marine surface sediment in the Laizhou Bay region, China

Geochemistry of reduced inorganic sulfur, reactive iron, and organic carbon in fluvial and marine surface sediment in the Laizhou Bay region, China

Iron geochemistry in surface sediments of a temperate semi-enclosed bay, North China

In Situ Chemical Transformations of Silver Nanoparticles along the Water–Sediment Continuum

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