Speciation and spatial distribution of solid-phase iron in surface sediments of the East China Sea continental shelf

Zhu, Mao‐Xu; Hao, Xiao-Chen; Shi, Xiao‐Xin; Yang, Gui‐Peng; Li, Tie

doi:10.1016/j.apgeochem.2012.01.004

Cited by 55 publications

(50 citation statements)

References 78 publications

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“…Average Fe T in Jiaozhou Bay surface sediments is in the same range as the China shelf sea (Zhao et al, 1995;Zhu et al, 2012b) and global continental shelf sediments in general (Raiswell and Canfield, 1998). Average Fe T /Al ratio (0.49 ± 0.04, range: 0.42e0.57) for the sediments is lower than the average (0.53) for China shelf sea sediments (Zhao et al, 1995) and also lower than that for shale (0.55) (Wedepohl, 1991).…”

Section: Assessment On Fe Inputs From Anthropogenic Originmentioning

confidence: 82%

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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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Section: Assessment On Fe Inputs From Anthropogenic Originmentioning

confidence: 82%

“…All extraction methods used in this study have been presented in detail in Zhu et al (2012b) and Chen et al (2013), and thus are described only briefly here (Fig. 2).…”

Section: Selective Extractions For Fe Speciationmentioning

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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“…Marine phytoplankton cells when of high density, would uptake bioavailable iron and decrease the DFe concentration (Boye et al, 2001(Boye et al, , 2003. Appearance of anoxia (due to red tide) in bottom water and sediments may cause the release of iron from sediments into surrounding waters (Sundby et al, 1986;Zhu et al, 2012). In coastal areas where monsoons blow, they transport dust and may be another factor that influence the distribution of DFe and L t , which may lead to seasonal variation in the DFe and L t , such as Funka Bay (Japan, Tsunogai and Uematsu, 1978) and Arabian Sea (Siefert et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Distribution and Speciation of Dissolved Iron in Jiaozhou Bay (Yellow Sea, China)

Yang

Pižeta

et al. 2016

Front. Mar. Sci.

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The distribution of total dissolved iron (DFe) and its chemical speciation were studied in vertical profiles of the shallow and semi-closed Jiaozhou Bay (JZB, China) during two contrasting periods: summer (July 19 th , 2011) and spring (May 10 th , 2012). Samples collected from the surface, middle and bottom layers were analyzed by competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-aCSV). The mean DFe concentration during the summer period (median 18.8 nM; average 20.7 nM) was higher than in the spring period (median 12.4 nM; average 16.9 nM), whereas the spatio-temporal variation in spring was larger than in summer. The DFe-values showed distinct regional and seasonal differences, ranging from 5.6 to 107 nM in spring period and 13.4 to 43.4 nM in summer period. In spring, the highest DFe-values were observed in the eastern coastal region, especially near an industrial area (up to 107 nM), whereas the DFe distribution in summer was relatively even. Due to a tide influence, the vertical variations in the DFe and L t in both seasons were not significant. On average, the L t concentration (one class of ligand was estimated in all samples), was higher in spring (35.2 ± 23.4 nM) than in summer (31.1 ± 10.3 nM). A statistically significant correlation was found between L t and DFe concentrations, it was higher for the summer period than for the spring period. The conditional stability constants (logK ′ ) of organic complexes with iron were weaker in spring (11.7 ± 0.3) than in summer (12.3 ± 0.3). The concentrations of L t were higher in comparison to DFe in all samples: the average [L t ]/[DFe] ratio in the spring and summer samples was 2.4 and 1.5, respectively. Speciation calculations showed that the DFe in the JZB existed predominantly (over 99.99%) in the form of strong organic complexes in both seasons.

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“…In the ECS, a large proportion of Yangtze River-derived sediments are transported southwards along the coast driven by the Zhejiang-Fujian Coastal Current (ZFCC) and trapped in the inner shelf due to the blocking by the northward offshore Taiwan Warm Current (TWC). An elongated inner-shelf mud wedge is consequently developed from Yangtze mouth to Taiwan Strait, which is broken at the mouth of the Qiantang River (Zhu et al, 2012). Another mud area in the central ECS is formed in the southwest off Cheju Island.…”

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confidence: 99%

“…4. Surface sediment particle size distribution and general circulation system in Chinese marginal seas (modified after Hu et al, 2011;Yang et al, 2003;Zhu et al, 2012;Guo et al, 2006 …”

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Distribution of mercury in coastal marine sediments of China: Sources and transport

Meng

Shi

Yun

et al. 2014

Marine Pollution Bulletin

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a b s t r a c tA total of 220 surface sediments and eight sediment cores were analyzed to study the distribution and transport of Hg in Chinese marginal seas. Spatial distribution showed a general offshore decreasing trend towards the outer continental shelf. Vertical profiles of sediment cores displayed a general increasing trend from bottom to surface layers. Coastal land-based discharges and river-derived inputs are probably the main sources of Hg in coastal sediments of China seas, while TOC, pH, ocean currents and sediment characteristics could play important roles in the transport and spatial distribution of Hg in sediment. The influence of TOC on Hg concentration is more significant than that of pH. The mud deposits on the coastal shelves are main sinks of Hg in the region. The results showed that sedimentary Hg was affected by regional anthropogenic activities and riverine runoffs, and was also influenced by long-range atmospheric transport and ocean current circulations.

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Speciation and spatial distribution of solid-phase iron in surface sediments of the East China Sea continental shelf

Cited by 55 publications

References 78 publications

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

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

Distribution and Speciation of Dissolved Iron in Jiaozhou Bay (Yellow Sea, China)

Distribution of mercury in coastal marine sediments of China: Sources and transport

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