Geochemical controls on the distribution and bioavailability of heavy metals in sediments from Yangtze River to the East China Sea: Assessed by sequential extraction versus diffusive gradients in thin-films (DGT) technique

Liang, Yuhao; Wang, Rui; Sheng, Gangfeng; Pan, Linhong; Lian, Ergang; Su, Ni; Tang, Xiliang; Yang, Shouye; Yin, Daqiang

doi:10.1016/j.jhazmat.2023.131253

Cited by 23 publications

(2 citation statements)

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“…Diffusive gradients in thin films (DGT) have been developed for measuring the bioavailable heavy metal [30]. Some researchers believed that the DGT-labile metals had positive relationships with the acid-soluble metals in the coastal sediment [31]. A study showed that the average values of DGT-labile Cd, Pb, Ni, Cu, Zn, and Mn were 0.78, 0.29, 0.23, 0.13, 34.2, and 12.4 µg/L, respectively, in coastal sediment in Hainan Island, South China Sea [32].…”

Section: The Fractions Of Heavy Metal In Intertidal Sedimentsmentioning

confidence: 99%

“…High salinity favors the solubility of weakly-bound metals because of the strong potential of major cations, such as Ca 2+ and Mg 2+ , can easily substitute for heavy metals on negatively charged sediment surfaces, although the effect of this factor on the adsorption-desorption behavior of heavy metals is less pronounced compared with pH [26]. Studies have shown that the salinity of the water at the surface of the sediment may regulate the metals' diffusion flux at the water-sediment interface and control the metals' bioaccessibility [31]. In the intertidal area, where marine and fresh water are mixed, salinity could increase the particulate phase of heavy metals by promoting the complexation of metal and organic matter [45].…”

Section: Physicochemical Conditions In the Aquatic Environmentmentioning

confidence: 99%

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Migration and Transformation of Heavy Metal and Its Fate in Intertidal Sediments: A Review

Geng,

Xia,

et al. 2024

Processes

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Intertidal sediments are rich in biological resources, which are important for material circulation and energy exchange. Meanwhile, these areas can be treated as sinks as well as sources of coastal heavy metal pollutants. Due to the influence of the tide, the intertidal sediments are in a state of periodic flooding and exposure, and environmental factors such as dissolved oxygen, salinity and overlying water pressure are changeable. Heavy metals in sediments are prone to migration and transformation with the dynamic effects of tidal water and the changes in the environment factors, which increase the bioavailability of heavy metals. In this review, the characteristics of distribution and the bioavailability of heavy metals in intertidal sediments are described; the migration and transformation behavior of heavy metals and its influencing factors under tidal conditions are analyzed; and the mechanisms of heavy metal’s migration and transformation in the intertidal zone are summarized. Moreover, the bioaccumulation of heavy metal by organisms and the remediation techniques are discussed. Therefore, this review systematically summarizes the states of existence, the transport mechanisms, and the fate of heavy metals in the intertidal sediment, fills in the research gap of the cycling of heavy metal in the intertidal zone, and provides a theoretical basis for the control of heavy metal pollution.

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Section: The Fractions Of Heavy Metal In Intertidal Sedimentsmentioning

confidence: 99%