Influence of early diagenesis on the vertical distribution of metal forms in sediments of Bohai Bay, China

Lu, Xueqiang; Zhang, Yan; Liu, Honglei; Xing, Meinan; Shao, Xinghua; Zhao, Feng; Li, Xiaojuan; Liu, Qiongqiong; Yu, Dapao; Yuan, Xuefei; Yuan, Min

doi:10.1016/j.marpolbul.2014.09.011

Cited by 15 publications

(11 citation statements)

References 27 publications

(33 reference statements)

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“…Under oxidizing conditions the coprecipitation and adsorption of metals with Fe-Mn oxides acts as sink of dissolved metal (Fairbrother et al, 2007;Lu et al, 2014). At more reductive conditions, first Mn and then Fe are reduced, both releasing adsorbed and co-precipitated metals including Co, Ni, Cr, Cd, Cu, Pb and Zn (Zwolsman et al, 1993).…”

Section: Chemical Metal Remobilizationmentioning

confidence: 99%

“…This release is amplified by sulphatemetal interaction, increasing pore or surface waterborne metal (Du Laing et al, 2009b). At even stronger reductive conditions sulphate is reduced to sulphide, which can complex metals and reduces mobility and toxicity (Du Laing et al, 2009c;Lu et al, 2014).…”

Section: Chemical Metal Remobilizationmentioning

confidence: 99%

“…Frequently flooded and higher salinity areas, in general, present higher organic matter due to lower optimal redox conditions for its degradation and higher chemical stability (Du Laing et al, 2009b). Moreover, the respiration and degradation products of organic matter causes reductive conditions and changes pH altering ionic composition of pore water and overall increasing mobility (Lu et al, 2014). Du Laing et al (2009b) found that when organic matter is being decomposed Ca, Mn, Ni and Fe are released upon CO 2 accumulation and Fe/Mn oxide reduction if no sulphide is present.…”

Section: Chemical and Biologically Mediated Metal Remobilizationmentioning

confidence: 99%

See 2 more Smart Citations

Metal fate and effects in estuaries: A review and conceptual model for better understanding of toxicity

Machado

Spencer

Kloas

et al. 2016

Science of The Total Environment

260

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Section: Chemical Metal Remobilizationmentioning

confidence: 99%

Section: Chemical Metal Remobilizationmentioning

confidence: 99%

Section: Chemical and Biologically Mediated Metal Remobilizationmentioning

confidence: 99%

See 1 more Smart Citation

Metal fate and effects in estuaries: A review and conceptual model for better understanding of toxicity

Machado

Spencer

Kloas

et al. 2016

Science of The Total Environment

260

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“…In addition, the stability of organic Cu complexes is also depending on the pH value in the environment, and the highest proportion of Cu is fixed with organic matter (i.e., humic substances) over the range of pH 4 to 7 [61]. Therefore, the low percentage of Cu in the organic fraction in our samples could be attributed to the low content of organic matter (less than 1% for most of the samples) and/or neutral pH values in the sediment from the Bohai Bay (ranging from 7 to 8.6) [62], which restricts the formation of stable complexes. Vertically, the variations of the residual and reducible fraction of Cu are similar to that of Pb, probably suggesting that the metals are controlled by the same geochemical processes or associated with similar sources.…”

Section: The Distribution Of Metals Fractions Along the Sediment Corementioning

confidence: 98%

Distribution and Risk Assessment of Heavy Metals in Sediment from Bohai Bay, China

2019

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Sediment core and porewater samples from the Western coastal tidal flat in Bohai Bay, China, were collected for meals and physical-chemical properties analysis. The vertical distribution characteristics of eight metals along the core was investigated based on 137Cs and 210Pb radionuclide dating. The chemical fractions of six metals (Cu, Pb, Zn, Ni, Mn and Cd) were also measured based on the modified European Community Bureau of Reference (BCR) sequential extraction procedures to better understand the mobility and bioavailability of these metals in the sediment. In addition, geoaccumulation index (Igeo) and risk assessment code (RAC) are used to assess risk status of these metals in the environment. 210Pb measurement indicates a sedimentation rate of about −1.87 cm∙year−1. The metals Cu, Zn, Pb and Ni show similar vertical distributions throughout the core, while Mn and Cd show different distribution patterns. Ni, Cu, Pb and Zn are strongly associated with the residual fraction while Mn and Cd are dominant in the acid-soluble fraction. According to the estimated diffusive fluxes, the Zn ions were the most mobilized, followed by Cu, Ni, Pb, and to a lesser extent Cd. The result of Igeo shows that Ni in sediments does not reflect any pollution, and Cu, Pb and Zn are in a level from unpolluted to modest polluted throughout the core. Mn and Cd have obvious anthropogenic sources. Based on the RAC, Cd and Mn pose a high to very high risk to the local environment, respectively, due to the significant percentage of exchangeable fraction. Clay content is significantly positively correlated with Ni, Cu, Al and Fe, and Cu, Pb, Zn and Ni might originate from the same sources or be influenced by similar geochemical processes. River runoff and atmospheric deposition are important sources for heavy metals, and since 1998, domestic sewage discharge might have had an important influence on the source of heavy metals (except for Cd and Mn).

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“…Water sedimens generally used as an indicator in monitoring water pollution for it can store most of the contaminants. The total heavy metal concentration can reflect the level of pollution in the marine environment, although they are not a good indicator for assessing bioavailability of heavy metals in organisms (Arifin and Fadhlina, 2009;Lu et al, 2014). Heavy metals that flow to the marine environments due to human activities show high mobility and are associated with carbonate, oxide, hydroxide and sulfide sedimentary phases (Bastami et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Source Identification, Bioavailability, and Risk Assessment based on Geochemical Fractionation of Heavy Metals Pb, Cu, and Zn in Surface Sediments of Kelabat Bay, Bangka Island

2019

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Although concentrations of many heavy metals has been measured totally, they may not give a good indicator for environmentally hazard to organism. The purpose of this study is to identify sources, determine bioavailability, and assess risk based on the geochemical fractionation of heavy metals Pb, Cu and Zn on the surface sediments of Kelabat Bay, Bangka Island. Fractionation of heavy metals was analyzed by sequential extraction. The concentrations of heavy metals Pb, Cu, and Zn in sediments ranged from 8.86-29.21 mg.kg-1 (average 16.85 mg /kg), 0.16-9.54 mg.kg-1 (average 4.39 mg.kg-1), and 25.58-237.24 mg.kg-1 (average 71.99 mg.kg-1). Pb and Zn in Kelabat Bay are more bound to non-residual fractions (F1+F2+F3) or non-resistant with a range of 60.63-89.87% and 47.98-84.66% that are mainly come from anthropogenic activities. Cu tend to be stored or bound to the residual fraction (F4) with a proportion of 97.7-100% meaning that it comes from natural sources. Based on the Risk Assessment Code (RAC), Pb have a low to moderate risk in the environment and Zn heavy metals are not at risk to low. These conditions indicate the potential for biological availability (bioavailability) of Pb and Zn in the inner bay waters. For heavy metals Cu is not at risk in the environment.

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Influence of early diagenesis on the vertical distribution of metal forms in sediments of Bohai Bay, China

Cited by 15 publications

References 27 publications

Metal fate and effects in estuaries: A review and conceptual model for better understanding of toxicity

Metal fate and effects in estuaries: A review and conceptual model for better understanding of toxicity

Distribution and Risk Assessment of Heavy Metals in Sediment from Bohai Bay, China

Source Identification, Bioavailability, and Risk Assessment based on Geochemical Fractionation of Heavy Metals Pb, Cu, and Zn in Surface Sediments of Kelabat Bay, Bangka Island

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