Kinetics of Hg(II) Exchange between Organic Ligands, Goethite, and Natural Organic Matter Studied with an Enriched Stable Isotope Approach

Jiskra, Martin; Saile, Damian; Wiederhold, Jan G.; Bourdon, Bernard; Björn, Erik; Kretzschmar, Ruben

doi:10.1021/es503483m

Cited by 51 publications

(53 citation statements)

References 84 publications

(213 reference statements)

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“…On the basis of these validations, the proposed method is expected to be a reliable technique in studying the dissolution of cinnabar. Isotope tracers have been already used for determining adsorption and desorption processes [19,29]. It has also been applied in investigating the methylation rates of geochemically relevant inorganic Hg(II) species, including isotopically labeled cinnabar, metacinnabar, adsorbed Hg(II), and complexed Hg(II) [46].…”

Section: Thermodynamics Of Hg Adsorption On Cinnabar and Validation Omentioning

confidence: 99%

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Evaluating the role of re-adsorption of dissolved Hg2+ during cinnabar dissolution using isotope tracer technique

Jiang

Liu

et al. 2016

Journal of Hazardous Materials

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Section: Thermodynamics Of Hg Adsorption On Cinnabar and Validation Omentioning

confidence: 99%

“…It has also been successfully used to quantify the adsorption and desorption of Hg in sediments and particles [19,29]. The objective of this study was to decipher the role of re-adsorption of the released Hg in cinnabar dissolution.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the role of re-adsorption of dissolved Hg2+ during cinnabar dissolution using isotope tracer technique

Jiang

Liu

et al. 2016

Journal of Hazardous Materials

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“…Mercury isotope tracer techniques have been widely applied in studying the transport and transformation of Hg (e.g., methylation/demethylation, oxidation/reduction, and adsorption/desorption) (73,(79)(80)(81)(82)(83)(84) in recent years mainly because of its high precision, short incubation time, and its ability to simultaneously determine the rates of multiple processes (10 developed and applied to the study of re-adsorption of re-leased Hg 2+ and the effects of dissolution and re-adsorption processes.…”

Section: Isotope Tracer Technique and Its Potential Applications In Hmentioning

confidence: 99%

“…Isotope tracers have been already used for determining adsorption and desorption processes (73,83). It has also been applied in investigating the methylation rates of geochemically relevant inorganic Hg(II) species, including isotopically labeled cinnabar, metacinnabar, adsorbed Hg(II), and complexed Hg(II) (84).…”

Section: Thermodynamics Of Hg Adsorption On Cinnabar and Validation Omentioning

confidence: 99%

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Mercury Sulfide Dissolution in Environmental Conditions: Thermodynamic and Kinetic Approaches

Jiang¹

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Considering the lack of feasible techniques to differentiate dissolution and readsorption processes, I first developed an efficient method using isotope tracer and isotope dilution techniques to investigate the re-adsorption of released Hg during HgS dissolution.The HgS dissolution rate with consideration of re-adsorption was two times the rate calculated from detecting Hg alone in the presence of O2, indicating the importance of Hg re-adsorption during HgS dissolution. I further examined the role of Hg-ligand complexation in HgS dissolution and Hg(II) re-adsorption using a thermodynamic vii adsorption method, selecting L-cysteine (Cys) as a model compound for low molecular weight ligands and Waskish fulvic acid (FA) for natural dissolved organic matter (DOM).My results suggest that the presence of Cys enhanced HgS dissolution through the decreased re-adsorption of Hg-Cys complex, whereas Waskish FA inhibited HgS dissolution, possibly because of the adsorption of FA on HgS surface that covered dissolution sites.I further employed a geochemical modeling method to study Hg speciation and the relation of iHg speciation to MeHg, aiming to provide a methodological example for potentially evaluating the implications of Hg species distribution during HgS dissolution on MeHg production. I applied geochemical model PHREEQC to the Florida Everglades, a well-studied wetland with model input parameters available, to determine the distribution of iHg in surface water at different sites. The modeling results suggest that sulfide and DOM govern iHg speciation, and the Hg-sulfide and Hg-DOM species are related to MeHg in environmental media but not fish, suggesting the importance of iHg speciation in MeHg production and the complexity of Hg bioaccumulation.viii water, soil, and sediment and can be methylated to the toxic MeHg through microbemediated (e.g., sulfate reducing bacteria, SRB or iron reducing bacteria, IRB) and abiotic processes (7, 9, 10). Because of its lipophilic and protein-binding properties, MeHg is then easily accumulated by aquatic biota through the food web (7).All Hg forms, in particular the organomercury species, are highly toxic substances (11).Acute Hg exposure can produce permanent damage to the nervous and other systems to cause a range of symptoms such as paresthesia, ataxia, sensory disturbances, tremors, renal toxicity, myocardial infarction, and even death (12). Chronic Hg exposure was considered to mainly occur from the consumption of contaminated fish and other aquatic organisms (13,14). Rice is another important pathway for human exposure to MeHg in recent years. 2This was first discovered in Guizhou province, China, and it potentially exists elsewhere (15-17). The toxicity of Hg depends on the chemical form and the sources of exposure (11).The most dangerous mercury species is MeHg, which is obtained mainly from the diet and can be almost completely absorbed into blood and then be distributed to other organs in the human body, such as brain, kidney, liver, hair, and other tissues within a f...

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Deposition of mercury in forests across a montane elevation gradient: Elevational and seasonal patterns in methylmercury inputs and production

et al. 2017

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Global mercury contamination largely results from direct primary atmospheric and secondary legacy emissions, which can be deposited to ecosystems, converted to methylmercury, and bioaccumulated along food chains. We examined organic horizon soil samples collected across an elevational gradient on Whiteface Mountain in the Adirondack region of New York State, USA to determine spatial patterns in methylmercury concentrations across a forested montane landscape. We found that soil methylmercury concentrations were highest in the midelevation coniferous zone (0.39 ± 0.07 ng/g) compared to the higher elevation alpine zone (0.28 ± 0.04 ng/g) and particularly the lower elevation deciduous zone (0.17 ± 0.02 ng/g), while the percent of total mercury as methylmercury in soils decreased with elevation. We also found a seasonal pattern in soil methylmercury concentrations, with peak methylmercury values occurring in July. Given elevational patterns in temperature and bioavailable total mercury (derived from mineralization of soil organic matter), soil methylmercury concentrations appear to be driven by soil processing of ionic Hg, as opposed to atmospheric deposition of methylmercury. These methylmercury results are consistent with spatial patterns of mercury concentrations in songbird species observed from other studies, suggesting that future declines in mercury emissions could be important for reducing exposure of mercury to montane avian species.

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Kinetics of Hg(II) Exchange between Organic Ligands, Goethite, and Natural Organic Matter Studied with an Enriched Stable Isotope Approach

Cited by 51 publications

References 84 publications

Evaluating the role of re-adsorption of dissolved Hg2+ during cinnabar dissolution using isotope tracer technique

Evaluating the role of re-adsorption of dissolved Hg2+ during cinnabar dissolution using isotope tracer technique

Mercury Sulfide Dissolution in Environmental Conditions: Thermodynamic and Kinetic Approaches

Deposition of mercury in forests across a montane elevation gradient: Elevational and seasonal patterns in methylmercury inputs and production

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