80-Hg Mercury

Fricke, G.; Heilig, K.

doi:10.1007/10856314_82

Cited by 7 publications

(17 citation statements)

References 21 publications

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“… 35 , but different methods (i.e., DHF vs. MP2, respectively), which lead to different results. In addition, there are suggestions that calculated results of Hg-bearing species used the mean square nuclear charge radii of Fricke and Heilig 41 are closer to the experiment results 35 . Note that different versions of the calculation software package (i.e., DIRAC04 and DIRAC13.1) have little impact on the calculated results (see Table S6 ).…”

Section: Discussionmentioning

confidence: 78%

“…Schauble 4 used the nuclear charge radii of Angeli 42 (i.e., <r 2 > 1/2 of 202 Hg and 198 Hg are 5.4633fm and 5.4466fm) and the nuclear charge radius difference (δ<r 2 > = <r 2 > A −<r 2 > A′ ) is 0.182fm 2 . But we use the nuclear charge radii from Fricke and Heilig 41 (i.e., <r 2 > 1/2 of 202 Hg and 198 Hg are 5.462fm and 5.443fm) and the nuclear charge radius difference (δ<r 2 > = <r 2 > A −<r 2 > A′ ) is 0.207fm 2 . Our results are roughly 1.137 times of those of Schauble 4 , consistent with the radii difference ratio, i.e., 0.207/0.182 = 1.137.…”

Section: Discussionmentioning

confidence: 99%

“…where the mean square nuclear charge radii (<r 2 >) can be found from the Landolt-Boernstein Database 41 for Hg and from Angeli 42 for Tl and Pb.…”

Section: Methodsmentioning

confidence: 99%

“… The black line is the slope of Δ 199 Hg/Δ 201 Hg of this study. The gray dash, dark gray solid, dark gray dot, dark gray short dash dot lines are the slop of Δ 199 Hg/Δ 201 Hg based on theoretical NVE-driven MIF calculated with radii of Landolt-Boernstein Databas 41 (calculated by Wiederhold et al . 35 ), experimental NVE-driven MIF of Zheng et al .…”

Section: Figurementioning

confidence: 99%

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Nuclear volume effects in equilibrium stable isotope fractionations of mercury, thallium and lead

Yang

Liu

2015

Sci Rep

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The nuclear volume effects (NVEs) of Hg, Tl and Pb isotope systems are investigated with careful evaluation on quantum relativistic effects via the Dirac’s formalism of full-electron wave function. Equilibrium 202Hg/198Hg, 205Tl/203Tl, 207Pb/206Pb and 208Pb/206Pb isotope fractionations are found can be up to 3.61‰, 2.54‰, 1.48‰ and 3.72‰ at room temperature, respectively, larger than fractionations predicted by classical mass-dependent isotope fractionations theory. Moreover, the NVE can cause mass-independent fractionations (MIF) for odd-mass isotopes and even-mass isotopes. The plot of vs. for Hg-bearing species falls into a straight line with the slope of 1.66, which is close to previous experimental results. For the first time, Pb4+-bearing species are found can enrich heavier Pb isotopes than Pb2+-bearing species to a surprising extent, e.g., the enrichment can be up to 4.34‰ in terms of 208Pb/206Pb at room temperature, due to their NVEs are in opposite directions. In contrast, fractionations among Pb2+-bearing species are trivial. Therefore, the large Pb fractionation changes provide a potential new tracer for redox conditions in young and closed geologic systems. The magnitudes of NVE-driven even-mass MIFs of Pb isotopes (i.e., ) and odd-mass MIFs (i.e., ) are almost the same but with opposite signs.

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

“…where the mean square nuclear charge radii (<r 2 >) can be found from the Landolt-Boernstein Database 41 for Hg and from Angeli 42 for Tl and Pb.…”

Section: Methodsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Nuclear volume effects in equilibrium stable isotope fractionations of mercury, thallium and lead

Yang

Liu

2015

Sci Rep

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“…NVF is related to the nuclear charge radii of the Hg isotopes which do not scale linearly with mass, 272 therefore, NVF is associated with mass independent fractionation (MIF). The expected mass 273 independent enrichment in E 199 Hg is calculated from the cationic enrichment factor of the nuclear 274 volume component (ε 202 Hg NVF ) using the scaling factors of 199/198 Hg relative to 202/198 Hg, 23 where SF MDF 275 is the kinetic mass dependent scaling factor of 0.252 and SF NVF is the nuclear volume scaling factor of 276 0.0525 using nuclear charge radii from Landolt-Boernstein: 55 277 Ε ଵଽଽ Hg = (ε ଶଶ Hg × SF ) − (ε ଶଶ Hg × SF ୈ ) (9) 278 Table 1, Table S2). This discrepancy between the experimental findings and the theoretical calculations for the Hg species is not yet fully understood.…”

Section: Possible Hg Isotope Fractionation Mechanisms Previous Studimentioning

confidence: 99%

Solution Speciation Controls Mercury Isotope Fractionation of Hg(II) Sorption to Goethite

Jiskra

Wiederhold

Bourdon

et al. 2012

Environ. Sci. Technol.

152

129

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The application of Hg isotope signatures as tracers for environmental Hg cycling requires the determination of isotope fractionation factors and mechanisms for individual processes. Here, we investigated Hg isotope fractionation of Hg(II) sorption to goethite in batch systems under different experimental conditions. We observed a mass-dependent enrichment of light Hg isotopes on the goethite surface relative to dissolved Hg (ε(202)Hg of -0.30‰ to -0.44‰) which was independent of the pH, chloride and sulfate concentration, type of surface complex, and equilibration time. Based on previous theoretical equilibrium fractionation factors, we propose that Hg isotope fractionation of Hg(II) sorption to goethite is controlled by an equilibrium isotope effect between Hg(II) solution species, expressed on the mineral surface by the adsorption of the cationic solution species. In contrast, the formation of outer-sphere complexes and subsequent conformation changes to different inner-sphere complexes appeared to have insignificant effects on the observed isotope fractionation. Our findings emphasize the importance of solution speciation in metal isotope sorption studies and suggest that the dissolved Hg(II) pool in soils and sediments, which is the most mobile and bioavailable, should be isotopically heavy, as light Hg isotopes are preferentially sequestered during binding to both mineral phases and natural organic matter.

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Introduction

Goodacre¹

2021

Applied Laser Spectroscopy for Nuclear Physics

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80-Hg Mercury

Cited by 7 publications

References 21 publications

Nuclear volume effects in equilibrium stable isotope fractionations of mercury, thallium and lead

Nuclear volume effects in equilibrium stable isotope fractionations of mercury, thallium and lead

Solution Speciation Controls Mercury Isotope Fractionation of Hg(II) Sorption to Goethite

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