Distribution and contamination pattern of heavy metals from surface sediments in the southern part of Caspian Sea, Iran

Naji, Abolfazl; Sohrabi, Tooraj

doi:10.1080/09542299.2015.1023089

Cited by 30 publications

(3 citation statements)

References 50 publications

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“…Additionally, except for the 0.2 and 4.5 mol•L −1 groups, the proportion of the residual state increased, compared with the that of control group in each group with vermiculite-montmorillonite added, indicating that the modifier had a certain passivating effect on Hg in soil, and that it can reduce the uptake of Hg by organisms in the soil. The role of PTEs in the environment is not only related to their total content, but also closely related to their existing forms in the environment [67]. There are also significant differences between the different chemical forms in terms of bioavailability and toxicity [68,69].…”

Section: Effect Of Modified Vermiculite-montmorillonite On the Hg Spe...mentioning

confidence: 99%

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Remediation of Soil Mercury by Modified Vermiculite-Montmorillonite and Its Effect on the Growth of Brassica chinensis L.

Cheng

et al. 2022

Molecules

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In this study, the surface of vermiculite-montmorillonite was modified by MnO2 loading. The modified vermiculite-montmorillonite was added to remediate the potentially toxic trace element (PTE) Hg present in soil containing coal gangue. Pot experiments were conducted to analyze and compare the pH values, Hg contents and Hg species present in coal gangue-containing soil, with and without the modified materials added, to determine whether the addition of modified materials had an effect on the growth of Brassica chinensis L. Results showed that with the addition of 35 g·kg−1 modified vermiculite-montmorillonite, the pH of soil increased by a value of 0.79, compared with that in the control group. When 15 g·kg−1 was added, the concentration of Hg in soil decreased by 98.2%. The addition of modified materials promoted the transformation of Hg in soil from a bioavailable form to an unavailable form; that is, the content of the residual form increased. The plant height and biomass of Brassica chinensis L. also increased, which indicated that the addition of modifiers can increase soil productivity, reduce the effects of PTEs on organisms in soil, and promote plant growth. Therefore, the addition of modified vermiculite-montmorillonite can achieve remediation of coal gangue-containing soil.

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Section: Effect Of Modified Vermiculite-montmorillonite On the Hg Spe...mentioning

confidence: 99%

“…The role of PTEs in the environment is not only related to their total content, but also closely related to their existing forms in the environment [67]. There are also significant differences between the different chemical forms in terms of bioavailability and toxicity [68,69].…”

Section: Effect Of Modified Vermiculite-montmorillonite On the Hg Spe...mentioning

confidence: 99%

Remediation of Soil Mercury by Modified Vermiculite-Montmorillonite and Its Effect on the Growth of Brassica chinensis L.

Cheng

et al. 2022

Molecules

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“…The total content of heavy metals in polluted soil cannot accurately reflect the level of pollution, because heavy metals exist in the soil in different chemical speciation, and each speciation has a different impact on the environment [43]. The Tessier sequential extraction method separates heavy metals in soil into the acid-extractable form (F1), carbonate-bound form (F2), Fe-Mn-oxides-bound form (F3), organic-matter-bound form (F4), and residue form (F5) [18].…”

Section: Effects Of Modified Biochar On Speciation Of CDmentioning

confidence: 99%

Effects of Modified Biochar on the Mobility and Speciation Distribution of Cadmium in Contaminated Soil

Zheng

Gao

et al. 2022

Processes

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Cadmium-contaminated soil poses a threat to the environment and human health. Biochar materials have received widespread attention as an in situ immobilizer for the efficient remediation of heavy-metal-contaminated soils. In this study, a modified biochar material (E–CBC) was developed for the immobilization of Cd in contaminated soil. E–CBC was characterized by XPS, SEM, BET, and FTIR. The effects of pristine biochar (BC) and E–CBC on soil physicochemical properties (pH and soil organic matter (SOM)), CaCl2-extractable Cd, total characteristics leaching procedure (TCLP) Cd, and speciation distribution of Cd were studied by incubation experiments. The results showed that the application of BC and E–CBC increased soil pH slightly and SOM significantly. A 2% dosage BC and E–CBC treatment reduced CaCl2-extractable Cd by 14.62% and 91.79%, and reduced TCLP Cd by 9.81% and 99.8%, respectively. E–CBC was shown to effectively induce the transition of Cd in the soil to a stable state. The application of a 0.25% dosage of E–CBC reduced the acid-extractable fraction of Cd from 58.06% to 10.66%. The functional groups increased after modification and may play an important role in the immobilization of Cd in the contaminated soil. In conclusion, E–CBC is a promising in situ immobilizer for the remediation of Cd-contaminated soil.

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Geochemical fractionation and pollution assessment of Zn, Cu, and Fe in surface sediments from Shadegan Wildlife Refuge, southwest of Iran

Chaharlang

Bakhtiari

Mohammadi

et al. 2017

Environ Sci Pollut Res

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This research focuses on the fractionation and distribution patterns of heavy metals (Zn, Cu, and Fe) in surficial sediments collected from Shadegan Wildlife Refuge, the biggest wetland in southern part of Iran, to provide an overall classification for the sources of metals in the study area using a sequential extraction method. For this purpose, a four-step sequential extraction technique was applied to define the partitioning of the metals into different geochemical phases of the sediment. The results illustrated that the average total level of Zn, Cu, and Fe in surface sediments were 55.20 ± 16.04, 22.86 ± 5.68, and 25,979.01 ± 6917.91 μg/g dw, respectively. On the average, the chemical partitioning of all metals in most stations was in the order of residual >oxidizable-organic > acid-reducible > exchangeable. In the same way, the results of calculated geochemical indices revealed that Cu, Zn, and Fe concentrations are mainly influenced by lithogenic origins. Compared with consensus-based SQGs, Cu was likely to result in occasionally harmful biological effects on the biota.

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Distribution and contamination pattern of heavy metals from surface sediments in the southern part of Caspian Sea, Iran

Cited by 30 publications

References 50 publications

Remediation of Soil Mercury by Modified Vermiculite-Montmorillonite and Its Effect on the Growth of Brassica chinensis L.

Remediation of Soil Mercury by Modified Vermiculite-Montmorillonite and Its Effect on the Growth of Brassica chinensis L.

Effects of Modified Biochar on the Mobility and Speciation Distribution of Cadmium in Contaminated Soil

Geochemical fractionation and pollution assessment of Zn, Cu, and Fe in surface sediments from Shadegan Wildlife Refuge, southwest of Iran

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