Mercury accumulation and speciation in plants and soils from abandoned cinnabar mines

Fernández-Martínez, Rodolfo; Larios, Raquel; Gómez-Pinilla, I.; Gómez-Mancebo, Belén; López-Andrés, Sol; Loredo, Jorge; Ordóñez, Almudena; Rucandio, Isabel

doi:10.1016/j.geoderma.2015.04.005

Cited by 63 publications

(9 citation statements)

References 52 publications

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“…Most studies on soil THg have been conducted in polluted sites, and have found a wide range in concentration of THg, from a few milligrams to several thousand milligrams per kilogram of soil (Fernández-Martínez et al, 2015;Reis et al, 2009). According to a survey of environmental Hg levels conducted in 18 prefectures of Japan, the residual soil THg concentrations varied between 0.002 mg kg -1 and 78.6 mg kg -1 (Nakagawa, 2008).…”

Section: Mercury Concentrations In Forest Soils and Native Earthwormsmentioning

confidence: 99%

Comparison of mercury and methylmercury bioaccumulation in earthworms (<i>Bimastus parvus</i>) native to landfill-leachate-contaminated forest soil

Arizono

Ji³

et al. 2018

J. Toxicol. Sci.

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Total mercury (THg) and methylmercury (MeHg) bioaccumulation was explored in the Bimastus parvus species of earthworm (B. parvus) native to the leachate-contaminated forest soils around a Hg-polluted traditional landfill in Japan. General soil properties and concentrations of THg and MeHg in forest soils and in B. parvus were determined. The results indicated that the average THg concentrations in B. parvus and in forest soils in the leachate-contaminated sites were 10.21 and 14.90 times higher than those in the reference sites, respectively, whereas similar average MeHg concentrations were observed in forest soils (< 0.01 mg kg) and in B. parvus (0.100-0.114 mg kg) across all sampled sites. The average bioaccumulation factors of THg in B. parvus (BAF) in forest soil were similar between the leachate-contaminated sites and the reference sites. Cluster and regression analyses demonstrated that the B. parvus Hg (THg and MeHg) and soil THg were positively correlated with each other and with soil organic matter (SOM) and clays, but were negatively correlated with sand and hardly correlated with silts and pH in leachate-contaminated forest soils. From these results, it was proposed that Hg exposure to food chains is possible through B. parvus, because B. parvus showed a high ability to accumulate THg and MeHg in both leachate-contaminated and reference forest soils. Together, these findings indicated that the role of B. parvus in MeHg production is not clear, and it is possible that the MeHg in B. parvus was firstly formed within forest soils and then accumulated in their tissues.

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Section: Mercury Concentrations In Forest Soils and Native Earthwormsmentioning

confidence: 99%

Comparison of mercury and methylmercury bioaccumulation in earthworms (<i>Bimastus parvus</i>) native to landfill-leachate-contaminated forest soil

Arizono

Ji³

et al. 2018

J. Toxicol. Sci.

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“…Metals exist either as separate entities or in combination with other soil components. Like other metals, Hg may be present in the soil in various forms, among which plants can readily accumulate mercuric ion (Hg 2+ ) from the soils [4]. Several studies have shown that Hg can be readily accumulated in higher plants [5].…”

Section: Introductionmentioning

confidence: 99%

Glutathione Restores Hg-Induced Morpho-Physiological Retardations by Inducing Phytochelatin and Oxidative Defense in Alfalfa

Rahman

Kabir

Mandal

et al. 2020

Biology

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Mercury (Hg) is toxic to plants, but the effect of glutathione in Hg alleviation was never studied in alfalfa, an important forage crop. In this study, Hg toxicity showed morphological retardation, chlorophyll reduction, and PSII inefficiency, which was restored due to GSH supplementation in alfalfa plants treated with Hg. Results showed a significant increase of Hg, but Fe and S concentrations substantially decreased in root and shoot accompanied by the downregulation of Fe (MsIRT1) and S (MsSultr1;2 and MsSultr1;3) transporters in roots of Hg-toxic alfalfa. However, GSH caused a significant decrease of Hg in the shoot, while the root Hg level substantially increased, accompanied by the restoration of Fe and S status, relative to Hg-stressed alfalfa. The subcellular analysis showed a substantial deposition of Hg in the root cell wall accompanied by the increased GSH and PC and the upregulation of MsPCS1 and MsGSH1 genes in roots. It suggests the involvement of GSH in triggering PC accumulation, causing excess Hg bound to the cell wall of the root, thereby reducing Hg translocation in alfalfa. Bioinformatics analysis showed that the MsPCS1 protein demonstrated one common conserved motif linked to the phytochelatin synthase domain (CL0125) with MtPCS1 and AtMCS1 homologs. These in silico analysis further confirmed the detoxification role of MsPCS1 induced by GSH in Hg-toxic alfalfa. Additionally, GSH induces GSH and GR activity to counteract oxidative injuries provoked by Hg-induced H2O2 and lipid peroxidation. These findings may provide valuable knowledge to popularize GSH-derived fertilizer or to develop Hg-free alfalfa or other forage plants.

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“…The studied soils show uncommonly high initial MeHg levels (6.4 -26.9 µg kg -1 ) when compared to other highly polluted mining or industrial legacy sites (Horvat et al, 2003;Neculita et al, 2005;Qiu et al, 2005;Fernández-Martínez et al, 2015). Still, we observed significant MeHg production during the first 28 days of the incubation resulting in even higher MeHg concentrations of up to (Table 3; Fig.…”

Section: Net-methylation During Flooding-draining Experimentmentioning

confidence: 44%

Comment on bg-2020-466

Poulin¹

2021

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Floodplain soils polluted with high levels of mercury (Hg) are potential point sources to downstream eco-systems.Repeated flooding (e.g. redox cycling) and agricultural activities (e.g. organic matter addition) may influence the fate and speciation of Hg in these soil systems. The formation and aggregation of colloids and particles influences both Hg mobility and its bioavailability to methylmercury (MeHg) forming microbes. In this study, we conducted a microcosm flooding-draining experiment on Hg polluted floodplain soils originating from an agriculturally used area situated in the Rhone Valley (Valais, Switzerland). The experiment comprised two 14 days flooding periods separated by one 14 days draining period. The effect of freshly added natural organic matter on Hg dynamics was assessed by adding liquid cow manure (+MNR) to two control soils characterized by different Hg (47.3 ± 0.6 mg kg -1 or 2.38 ± 0.01 mg kg -1 ) and organic carbon (OC: 1.92 wt. % or 3.45 wt. %) contents. During the experiment, the release, colloid formation and methylation of Hg in the soil solution were monitored. Upon manure addition in the highly polluted soil (lowest OC), an accelerated release of Hg to the soil solution could be linked to a fast reductive dissolution of Mn oxides. The manure treatments showed a fast sequestration of Hg and a higher percentage of particulate (0.02 -10 µm) bound Hg. As well, analyses of soil solutions by asymmetrical flow field-flow fractionation coupled with inductively coupled plasma mass spectrometry (AF4-ICP-MS) revealed a proportional increase of colloidal DOM-Hg and inorganic colloidal Hg (+MNR: 70 -100 %; control: 32 -70 %) upon manure addition. Our experiment shows that net Hg methylation (MeHg/Hg) was highest after the first draining period and decreased again after the second flooding period. No significant effects on methylation upon manure addition was found. The results of this study suggest that manure addition may promote sequestration by Hg complexation on large organic matter components and the formation/aggregation of inorganic HgS(s) colloids in Hg polluted fluvisols with low levels of natural organic matter.

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Mercury accumulation and speciation in plants and soils from abandoned cinnabar mines

Cited by 63 publications

References 52 publications

Comparison of mercury and methylmercury bioaccumulation in earthworms (<i>Bimastus parvus</i>) native to landfill-leachate-contaminated forest soil

Comparison of mercury and methylmercury bioaccumulation in earthworms (<i>Bimastus parvus</i>) native to landfill-leachate-contaminated forest soil

Glutathione Restores Hg-Induced Morpho-Physiological Retardations by Inducing Phytochelatin and Oxidative Defense in Alfalfa

Comment on bg-2020-466

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