Translocation and distribution of mercury in biomasses from subtropical forest ecosystems: evidence from stable mercury isotopes

Liu, Yi; Lin, Che‐Jen; Yuan, Wei; Lü, Zifeng; Feng, Xinbin

doi:10.1007/s11631-020-00441-3

Cited by 9 publications

(10 citation statements)

References 67 publications

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“…We derived a slope of 1.25 ± 0.13 (1 SE) for bole wood using York orthogonal regression (Fig. S8.1; York et al, 2004), which is higher than other studies (1.04 in Wang et al, 2021;1.05 in Scanlon et al, 2020, andLiu et al, 2021) but still lies in the range of the expected slope (1.0-1.3) for MIE-related photochemical reduction of Hg(II) to Hg(0) (Bergquist and Blum, 2007;Zheng and Hintelmann, 2009). The observed MIF data suggest MIE-related photochemical reduction and subsequent Hg(0) evasion is likely the dominant pathway of Hg(0) to the atmosphere.…”

Section: Mass-independent Fractionation (Mif)mentioning

confidence: 54%

“…These estimates assume Hg in tree rings is derived from foliar uptake of GEM from the atmosphere, which is suggested to be the dominant uptake pathway of Hg in trees (e.g. Beauford et al, 1977;Graydon et al, 2009;Cozzolino et al, 2016) with no further MDF during downward transport of Hg within the trees (as observed by Liu et al, 2021).…”

Section: Mass-dependent Fractionation (Mdf)mentioning

confidence: 99%

“…Hg on leaf surfaces contributes only a minor fraction of THg in foliage, and accumulation rates are low due to both precipitation wash-off (Rea et al, 2000(Rea et al, , 2001Laacouri et al, 2013) and photoreduction and subsequent evasion of GEM (Graydon et al, 2009;Mowat et al, 2011). Several studies have demonstrated elevated bark THg concentrations relative to branch and bole wood (Siwik et al, 2010;Zhou et al, 2017;Liu et al, 2021). Therefore, it has been suggested that Hg in bark is chiefly derived from atmospheric deposition (Chiarantini et al, 2016(Chiarantini et al, , 2017, potentially with a greater proportion of GOM and PBM rather than GEM (Peckham et al, 2019a).…”

Section: Introductionmentioning

confidence: 99%

“…A recent study examining three evergreen species used Hg stable isotopes to show that reduction and re-release can occur (Yuan et al, 2018). Although the bole wood of trees has lower THg concentrations than bark and needles/leaves in both deciduous and evergreen species (Navrátil et al, 2017;Zhou et al, 2017;Liu et al, 2021), the overall Hg loading of the tree is the reverse: wood carries the largest total mass of Hg due to much greater overall biomass (Liu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Internal tree cycling and atmospheric archiving of mercury: examination with concentration and stable isotope analyses

et al. 2022

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Abstract. Trees predominantly take up mercury (Hg) from the atmosphere via stomatal assimilation of gaseous elemental Hg (GEM). Hg is oxidised in leaves/needles and transported to other tree anatomy including bole wood, where it can be stored long-term. Using Hg associated with growth rings facilitates archiving of historical GEM concentrations. Nonetheless, there are significant knowledge gaps on the cycling of Hg within trees. We investigate Hg archived in tree rings, internal tree Hg cycling, and differences in Hg uptake mechanisms in Norway spruce and European larch sampled within 1 km of a HgCl2-contaminated site using total Hg (THg) and Hg stable isotope analyses. Tree ring samples are indicative of significant increases in THg concentrations (up to 521 µg kg−1) from the background period (BGP; facility closed; 1992–present) to secondary industrial period (2ndIP; no HgCl2 wood treatment; 1962–1992) to primary industrial period (1stIP; active HgCl2 wood treatment; ≈ 1900–1962). Mass-dependent fractionation (MDF) Hg stable isotope data are shifted negative during industrial periods (δ202Hg of 1stIP: −4.32 ± 0.15 ‰, 2ndIP: −4.04 ± 0.32 ‰, BGP: −2.83 ± 0.74 ‰; 1 SD). Even accounting for a ≈ −2.6 ‰ MDF shift associated with stomatal uptake, these data are indicative of emissions derived from industrial activity being enriched in lighter isotopes associated with HgCl2 reduction and Hg0 volatilisation. Similar MDF (δ202Hg: −3.90 ± 0.30 ‰; 1 SD) in bark Hg (137 ± 105 µg kg−1) suggests that stomatal assimilation and downward transport is also the dominant uptake mechanism for bark Hg (reflective of negative stomatal-uptake MDF shift) rather than deposition to bark. THg was enriched in sapwood of all sampled trees across both tree species. This may indicate long-term storage of a fraction of Hg in sapwood or xylem solution. We also observed a small range of odd-isotope mass-independent fractionation (MIF). Differences in Δ199Hg between periods of different industrial activities were significant (Δ199Hg of 1stIP: 0.00 ± 0.03 ‰, 2ndIP: −0.06 ± 0.04 ‰, BGP: −0.13 ± 0.03 ‰; 1 SD), and we suggest MIF signatures are conserved during stomatal assimilation (reflect source MIF signatures). These data advance our understanding of the physiological processing of Hg within trees and provide critical direction to future research into the use of trees as archives for historical atmospheric Hg.

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Section: Mass-independent Fractionation (Mif)mentioning

confidence: 54%

Section: Mass-dependent Fractionation (Mdf)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Internal tree cycling and atmospheric archiving of mercury: examination with concentration and stable isotope analyses

et al. 2022

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“…Heavy metal(loid)s could induce a serial of adverse effects on human beings and animals and deteriorate the environment through natural and anthropogenic activities [1][2][3][4]. Lead-zinc smelting is an important source of potentially toxic elements [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Heavy Metal(loid)s Contamination in Ground Dust and Associated Health Risks at a Former Indigenous Zinc Smelting Area

et al. 2021

IJERPH

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Indigenous zinc smelting (IZS) is a backward technique that releases a great deal of heavy metal(loid)s into the environment. However, the contamination of heavy metal(loid)s in ground dust and the associated health risks in such areas are poorly known. In this study, a former IZS area in Guizhou, China, was surveyed during 2008–2018 with 15 elements (Ag, As, Bi, Cd, Co, Cr, Cu, Hg, In, Ni, Pb, Sb, Sn, Tl, Zn) being analyzed. The results indicate that most elements (e.g., Ag, As, Cd, Cu, Pb, Sb, Sn, Zn) in ground dust decreased significantly after the cessation of the IZS in 2006; nevertheless, some elements still remained at relatively high levels in 2018, e.g., Pb (average: 762 ± 647 mg/kg), Zn (average: 1287 ± 753 mg/kg), Cd (average: 7.76 ± 5.06 mg/kg), and As (average: 41.9 ± 34.8 mg/kg), indicating they might come from the local contaminated soils, slag residues and smelting potteries. In terms of the impacts on human health, children have both higher non-carcinogenic and carcinogenic risks than that of adults, with the latter subpopulation having a lower risk than the threshold values. Pb and As were the two elements with the highest non-carcinogenic risk for children, the hazard index of local children was still higher than the threshold of 1 (e.g., 1.43 for As, 2.09 for Pb) in 2018. The carcinogenic risk of As exposure to children dropped more than two times to 6.42 × 10−7 in 2018, which falls below the tolerable range (10−6–10−4). This study revealed that although the concentration of heavy metal(loid)s in ground dust and linked health risk in the IZS area has reduced dramatically after the cessation of IZS, continued removal of slag residues and smelting potteries is necessary for further decreasing the human health risk.

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Atmospheric Hg(0) dry deposition over environmental surfaces: Insights from mercury isotope fractionation

Liu,

Guo

et al. 2024

Eco-Environment & Health

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Translocation and distribution of mercury in biomasses from subtropical forest ecosystems: evidence from stable mercury isotopes

Cited by 9 publications

References 67 publications

Internal tree cycling and atmospheric archiving of mercury: examination with concentration and stable isotope analyses

Internal tree cycling and atmospheric archiving of mercury: examination with concentration and stable isotope analyses

Heavy Metal(loid)s Contamination in Ground Dust and Associated Health Risks at a Former Indigenous Zinc Smelting Area

Atmospheric Hg(0) dry deposition over environmental surfaces: Insights from mercury isotope fractionation

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