Effect of Thioligands on Plant-Hg Accumulation and Volatilisation from Mercury-contaminated Mine Tailings

Moreno, Fábio Netto; Anderson, Christopher; Stewart, Robert B.; Robinson, Brett; Nomura, Roberto Harutomi Corrêa; Ghomshei, Mory; Meech, J.A.

doi:10.1007/s11104-005-1755-0

Cited by 51 publications

(29 citation statements)

References 37 publications

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“…For air-foliage Hg 0 exchange, earlier parameterizations (S1 , Table 2) calculate the flux as a function of the evapotranspiration rate based on soil-root-stem-foliage transpiration stream. It is assumed that Hg is passed through the soil-root interface and then transferred into foliage in as complexes with organic ligands (Moreno et al, 2005a, b;Wang et al, 2012). However, root uptake is unlikely to occur (Cui et al, 2014).…”

Section: Modeling Of Air-surface Hg 0 Exchange Fluxmentioning

confidence: 99%

Global observations and modeling of atmosphere–surface exchange of elemental mercury: a critical review

et al. 2016

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Abstract. Reliable quantification of air-surface fluxes of elemental Hg vapor (Hg 0 ) is crucial for understanding mercury (Hg) global biogeochemical cycles. There have been extensive measurements and modeling efforts devoted to estimating the exchange fluxes between the atmosphere and various surfaces (e.g., soil, canopies, water, snow, etc.) in the past three decades. However, large uncertainties remain due to the complexity of Hg 0 bidirectional exchange, limitations of flux quantification techniques and challenges in model parameterization. In this study, we provide a critical review on the state of science in the atmosphere-surface exchange of Hg 0 . Specifically, the advancement of flux quantification techniques, mechanisms in driving the air-surface Hg exchange and modeling efforts are presented. Due to the semi-volatile nature of Hg 0 and redox transformation of Hg in environmental media, Hg deposition and evasion are influenced by multiple environmental variables including seasonality, vegetative coverage and its life cycle, temperature, light, moisture, atmospheric turbulence and the presence of reactants (e.g., O 3 , radicals, etc.). However, the effects of these processes on flux have not been fundamentally and quantitatively determined, which limits the accuracy of flux modeling.We compile an up-to-date global observational flux database and discuss the implication of flux data on the global Hg budget. Mean Hg 0 fluxes obtained by micrometeorological measurements do not appear to be significantly greater than the fluxes measured by dynamic flux chamber methods over unpolluted surfaces (p = 0.16, one-tailed, Mann-Whitney U test). The spatiotemporal coverage of existing Hg 0 flux measurements is highly heterogeneous with large data gaps existing in multiple continents (Africa, South Asia, Middle East, South America and Australia). The magnitude of the evasion flux is strongly enhanced by human activities, particularly at contaminated sites. Hg 0 flux observations in East Asia are comparatively larger in magnitude than the rest of the world, suggesting substantial re-emission of previously deposited mercury from anthropogenic sources. The Hg 0 exchange over pristine surfaces (e.g., background soil and water) and vegetation needs better constraints for global analyses of the atmospheric Hg budget. The existing knowledge gap and the associated research needs for future measurements and modeling efforts for the air-surface exchange of Hg 0 are discussed.

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Section: Modeling Of Air-surface Hg 0 Exchange Fluxmentioning

confidence: 99%

Global observations and modeling of atmosphere–surface exchange of elemental mercury: a critical review

et al. 2016

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“…Mercury is a 'soft metal' based on the Lewis hard and soft acidbase principle (Pearson, 1963), and thus has high affinity to sulfurcontaining compounds including (NH 4 ) 2 S 2 O 3 (Moreno et al, 2005b(Moreno et al, , 2005c. Therefore, (NH 4 ) 2 S 2 O 3 has been widely used to increase mobility and phytoavailability of soil-bound mercury in phytoextraction (Cassina et al, 2012;Hinton and Veiga, 2001;Moreno et al, 2005bMoreno et al, , 2005cMuddarisna et al, 2013;Pedron et al, 2013;Wang et al, 2011Wang et al, , 2014.…”

Section: Prediction Of Mehg Accumulation In Rice Grains By (Nh 4 ) 2 mentioning

confidence: 99%

“…Therefore, (NH 4 ) 2 S 2 O 3 has been widely used to increase mobility and phytoavailability of soil-bound mercury in phytoextraction (Cassina et al, 2012;Hinton and Veiga, 2001;Moreno et al, 2005bMoreno et al, , 2005cMuddarisna et al, 2013;Pedron et al, 2013;Wang et al, 2011Wang et al, , 2014. Unfortunately, application of (NH 4 ) 2 S 2 O 3 for assessing phytoavailability of MeHg in paddy soils or predicting MeHg accumulation in rice plants has not been studied yet, as far as we know.…”

Section: Prediction Of Mehg Accumulation In Rice Grains By (Nh 4 ) 2 mentioning

confidence: 99%

Prediction of methylmercury accumulation in rice grains by chemical extraction methods

Zhu

Zhong

Zeng

et al. 2015

Environmental Pollution

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“…These mercury resistance genes are ubiquitous in soils as they are generally carried by mobile genetic elements such as transposons and plasmids (Schneiker et al 2001). The few studies available on the role of rhizosphere in mercury volatilisation found either enhanced (Moreno et al 2005) (Johnson et al 2003) Hg 0 volatilisation in planted as compared to non-planted soil. The contrasting results may reflect the plant-specifity of stimulation of microbial strains capable of volatilising mercury.…”

Section: Rhizosphere Controls Of Metal/metalloid Volatilisationmentioning

confidence: 99%

Rhizosphere processes and management in plant-assisted bioremediation (phytoremediation) of soils

2008

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Plant-assisted bioremediation or phytoremediation holds promise for in situ treatment of polluted soils. Enhancement of phytoremediation processes requires a sound understanding of the complex interactions in the rhizosphere. Evaluation of the current literature suggests that pollutant bioavailability in the rhizosphere of phytoremediation crops is decisive for designing phytoremediation technologies with improved, predictable remedial success. For phytoextraction, emphasis should be put on improved characterisation of the bioavailable metal pools and the kinetics of resupply from less available fractions to support decision making on the applicability of this technology to a given site. Limited pollutant bioavailability may be overcome by the design of plantmicrobial consortia that are capable of mobilising metals/metalloids by modification of rhizosphere pH (e.g. by using Alnus sp. as co-cropping component) and ligand exudation, or enhancing bioavailability of organic pollutants by the release of biosurfactants. Apart from limited pollutant bioavailability, the lack of competitiveness of inoculated microbial strains (in particular degraders) in field conditions appears to be another major obstacle. Selecting/engineering of plant-microbial pairs where the competitiveness of the microbial partner is enhanced through a "nutritional bias" caused by exudates exclusively or primarily available to this partner (as known from the "opine concept") may open new horizons for rhizodegradation of organically polluted soils. The complexity and heterogeneity of multiply polluted "real world" soils will require the design of integrated approaches of rhizosphere management, e.g. by combining co-cropping of phytoextraction and rhizodegradation crops, inoculation of microorganisms and soil management. An improved understanding of the rhizosphere will help to translate the results of simplified bench scale and pot experiments to the full complexity and heterogeneity of field applications.

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Effect of Thioligands on Plant-Hg Accumulation and Volatilisation from Mercury-contaminated Mine Tailings

Cited by 51 publications

References 37 publications

Global observations and modeling of atmosphere–surface exchange of elemental mercury: a critical review

Global observations and modeling of atmosphere–surface exchange of elemental mercury: a critical review

Prediction of methylmercury accumulation in rice grains by chemical extraction methods

Rhizosphere processes and management in plant-assisted bioremediation (phytoremediation) of soils

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