Effects of Metal-Soil Contact Time on the Extraction of Mercury from Soils

Ma, Lan; Zhong, Huan; Wu, Yali

doi:10.1007/s00128-015-1468-x

Cited by 27 publications

(11 citation statements)

References 39 publications

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“…Soil was spiked with IHg (as 80 mg L -1 mercury nitrate monohydrate, Sigma-Aldrich) and equilibrated under flooded conditions for 20 days, after which differences in Hg geochemical fractionation or bioavailability became less evident between spiked and ambient Hg (Ma et al 2015). The total Hg concentration in the spiked soil was 2.2 ± 0.1 mg kg -1 (n = 21), which was within the range of reported soil Hg concentrations (0.56-390 mg kg -1 ) in Hg-contaminated areas (e.g., due to discharge from chemical factories, Zhang et al 2008;Huang et al 2011).…”

Section: Pot Experimentsmentioning

confidence: 99%

Amendment of sulfate with Se into soils further reduces methylmercury accumulation in rice

et al. 2016

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Purpose Both selenium (Se) and sulfate could largely affect methylmercury (MeHg) dynamics and phytoavailability in soil-rice systems, while their combined effects are less understood. Here, we aimed at exploring the potential effects of sulfate on MeHg accumulation in rice in the presence of Se. Materials and methods Rice was cultivated in inorganic Hgspiked soils amended with Se only (selenite/selenate, BSe treatments^) or Se and sulfate (BSe + Sulfate treatments^). Soil parameters (e.g., pH and redox potential (Eh)), MeHg concentrations in soils, as well as MeHg or Se accumulation in rice plants were quantified during the rice growth period. Results and discussion Soil MeHg concentrations were generally comparable between Se + Sulfate and Se treatments. However, MeHg uptake by rice plants in Se + Sulfate treatments was 9-31 % lower than those in Se treatments, possibly due to the increased soil pH and formation of iron sulfides, which may reduce MeHg phytoavailability under sulfate amendment. Furthermore, sulfate input enhanced Se accumulation in root (especially in the presence of selenate), which could be responsible for the increased MeHg distribution in root and thus lower MeHg distribution in grain. Consequently, the reduced plant uptake of MeHg together with the decreased MeHg distribution in grain resulted in decline of grain MeHg concentrations in Se + Sulfate treatments (8-31 % lower compared to Se treatments). Conclusions Our results suggest that sulfate input with Se could further reduce MeHg accumulation in rice, which improved mechanistic understanding of MeHg behaviors in soilrice systems.

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Section: Pot Experimentsmentioning

confidence: 99%

Amendment of sulfate with Se into soils further reduces methylmercury accumulation in rice

et al. 2016

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“…After that time the chemical fraction of Hg in spiked soil remained stable . This finding supported the study of Ma et al who stated that newly applied metals are initially transformed to more mobile geochemical fractionations and then gradually transformed into more refractory states with prolonged contact time, resulting in lower bioavailability …”

Section: Resultsmentioning

confidence: 99%

“…Chemical fractionation is an useful approach to determine the relationship between available fraction of a given heavy metal in soil and its subsequent content in plants. 55 The present study of Hg assisted phytoextraction was carried out on HgCl 2 spiked soil/growing medium. The stabilization period was 7 days.…”

Section: Efficiency Of Phytoextractionmentioning

confidence: 99%

“…This finding supported the study of Ma et al who stated that newly applied metals are initially transformed to more mobile geochemical fractionations and then gradually transformed into more refractory states with prolonged contact time, resulting in lower bioavailability. 55 Studies into the efficiency of Hg contaminated soil phytoextraction by L. sativum L. involved analyses of metal accumulation by the plant. The analyses were then used to determine the factors, i.e.…”

Section: Efficiency Of Phytoextractionmentioning

confidence: 99%

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The influence of compost and nitrilotriacetic acid on mercury phytoextraction by Lepidium sativum L.

Smolińska

2019

J of Chemical Tech & Biotech

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BACKGROUND The investigations on enhanced phytoextraction are focused on both the influence of soil amendments on reclamation efficiency, and processes that occur in plant cells as its response to pollutants. The aim of the present study was to analyze the glutathione content (GSH) as a response of Lepidium sativum L. to substances used in assisted phytoextraction of mercury (Hg) contaminated soil. The simultaneous influence of compost from green wastes and nitrilotriacetic acid (NTA) on Hg accumulation and translocation was investigated. The study also focused on the Hg leaching after assisted phytoextraction. RESULTS The results of the study showed that application of compost and NTA increased Hg translocation to plant shoots over 128–154%. A corresponding increase of GSH was observed. Application of soil enhancements decreased the concentration of leached Hg (LHg) around 24% when compared to Hg treated soil. CONCLUSION Lepidium sativum L. showed the potential as a tolerant plant that can be used in biological soil reclamation process. Simultaneous application of compost and NTA promoted Hg phytoextraction efficiency and at the same time decreased the potential leachable fraction of Hg in soil. The increased Hg translocation to plant shoots was correlated with the growth of GSH content in plants, as a plant response to environmental conditions. © 2019 Society of Chemical Industry

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“…To approximate the bioavailable Se, As and Hg in the artificial soil and tailings treatments, CaCl 2 extractions were completed (Ma et al 2015;Vazquez et al 2008;Zagury et al 2006). After the plant and worm experiments were completed, 2 g of the soil/tailing material from each treatment was mixed with 20 ml of 0.01 M CaCl 2 solution in a 50-ml vial.…”

Section: Geochemical Characterization Of Experimental Mediamentioning

confidence: 99%

Can a Low-Dose Selenium (Se) Additive Reduce Environmental Risks of Mercury (Hg) and Arsenic (As) in Old Gold Mine Tailings?

Chapman¹,

Robinson²,

Berry

et al. 2016

Water Air Soil Pollut

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Selenium (Se) has long been known as an effective antagonist for counteracting mercury (Hg) and arsenic (As) toxicity in many animal and plant species. This study is the first to assess a low-dose Se additive as an in situ remediation tool for As-and Hgcontaminated gold mine tailing material. Mine tailing material from an 1860s gold mine stamp mill site was treated with different concentrations of sodium selenite (0, 0.5, 1, 3, 8, and 15 mg Se/kg). Reclamation grass seeds planted in each treatment showed significantly decreased plant toxicity with increasing [Se], as measured by increases in biomass, % emergence, and root lengths. Leachate was collected from each pot after the grass was harvested. The lowest Hg and As concentrations measured in the leachate were associated with the 1 mg Se/kg treatment (94 and 71 % lower than concentrations in leachate from untreated tailing material) and increased with lower and higher Se treatments. Finally, earthworms (Eisenia andrei) were introduced to the experimental treatments. Earthworm [Hg] decreased with increasing [Se], but this effect was confounded by differing [Hg] in the tailing material. Earthworm [As] decreased with [Se] up to 3 mg Se/kg, then earthworm [As] increased with tailing [Se]. This experiment confirms that low-dose selenium additions (up to 3 mg Se/ kg tailing material) can have beneficial effects by limiting toxicity and mobility of As and Hg from the tailing material for both grass and earthworms.

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Effects of Metal-Soil Contact Time on the Extraction of Mercury from Soils

Cited by 27 publications

References 39 publications

Amendment of sulfate with Se into soils further reduces methylmercury accumulation in rice

Amendment of sulfate with Se into soils further reduces methylmercury accumulation in rice

The influence of compost and nitrilotriacetic acid on mercury phytoextraction by Lepidium sativum L.

Can a Low-Dose Selenium (Se) Additive Reduce Environmental Risks of Mercury (Hg) and Arsenic (As) in Old Gold Mine Tailings?

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