Distribution of mercury isotope signatures in Yundang Lagoon, Xiamen, China, after long-term interventions

Huang, Shuyuan; Zhao, Yuhan; Lv, Supeng; Wang, Weiguo; Wang, Weili; Zhang, Yuanbiao; Huo, Yunlong; Sun, Xiaoqi; Chen, Yaojin

doi:10.1016/j.chemosphere.2021.129716

Cited by 15 publications

(3 citation statements)

References 80 publications

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“…Generally, these results displayed a trend of fractions progressing towards lighter isotopes with increasing extraction strength; heaviest isotopes were found in the water-extractable fraction (F1) and lightest in the aqua regia fraction (F4) (Fig. 2-6 and Section S7 †), which is consistent with the data from Brocza et al 55 However, other studies have reported different trends, 90,91 or no signicant isotopic variations between different soil extracts. 63 These studies all used different SEP methods (different extractants), which will result in different species released in the extractions steps of these individual studies.…”

Section: View Article Onlinesupporting

confidence: 88%

Demystifying mercury geochemistry in contaminated soil–groundwater systems with complementary mercury stable isotope, concentration, and speciation analyses

McLagan

Schwab

Wiederhold

et al. 2022

Environ. Sci.: Processes Impacts

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Section: View Article Onlinesupporting

confidence: 88%

Demystifying mercury geochemistry in contaminated soil–groundwater systems with complementary mercury stable isotope, concentration, and speciation analyses

McLagan

Schwab

Wiederhold

et al. 2022

Environ. Sci.: Processes Impacts

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“…The salt-sludge water-soluble Hg pool displayed an irregular pattern with variability in enrichment from notably lighter to heavier than the bulk THg (Δ-δ 202 Hg water‑soluble THg = −0.84 to 0.54‰, mean = −0.10‰, n = 6). The water-soluble Hg pool in soils and sediments has been observed to vary in its solubility, with some studies reporting substantially lower levels, ,, while others report similar , or higher ,,, levels of δ 202 Hg signatures compared to the bulk THg. This variation is thought to result from the differential binding of Hg isotopes in different chemical forms of Hg in the substrates, as well as the kinetic and equilibrium processes that desorb Hg(II) from the matrix surface during extraction. , However, the uppermost soils ( e.g.…”

Section: Resultsmentioning

confidence: 99%

Legacy Mercury Re-emission and Subsurface Migration at Contaminated Sites Constrained by Hg Isotopes and Chemical Speciation

Zhu,

Li,

et al. 2024

Environ. Sci. Technol.

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The re-emission and subsurface migration of legacy mercury (Hg) are not well understood due to limited knowledge of the driving processes. To investigate these processes at a decommissioned chlor-alkali plant, we used mercury stable isotopes and chemical speciation analysis. The isotopic composition of volatilized Hg(0) was lighter compared to the bulk total Hg (THg) pool in salt-sludge and adjacent surface soil with mean ε 202 Hg Hg(0)-THg values of −3.29 and −2.35‰, respectively. Hg(0) exhibited dichotomous directions (E 199 Hg Hg(0)-THg = 0.17 and −0.16‰) of massindependent fractionation (MIF) depending on the substrate from which it was emitted. We suggest that the positive MIF enrichment during Hg(0) reemission from salt-sludge was overall controlled by the photoreduction of Hg(II) primarily ligated by Cl − and/or the evaporation of liquid Hg(0). In contrast, O-bonded Hg(II) species were more important in the adjacent surface soils. The migration of Hg from salt-sludge to subsurface soil associated with selective Hg(II) partitioning and speciation transformation resulted in deep soils depleted in heavy isotopes (δ 202 Hg = −2.5‰) and slightly enriched in odd isotopes (Δ 199 Hg = 0.1‰). When tracing sources using Hg isotopes, it is important to exercise caution, particularly when dealing with mobilized Hg, as this fraction represents only a small portion of the sources.

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“…All trapping solutions were preserved with 1 % (v/v) BrCl and stored at 4 • C in the dark before the Hg isotope analysis. Hg isotopic compositions were measured by a multicollector inductively coupled plasma mass spectrometer (MC-ICP-MS; Nu Instruments Ltd, UK) equipped with an introduction device, following the protocols presented in previous studies (Huang et al, 2015(Huang et al, , 2021Lin et al, 2015). The introduction device includes a modified cold vapor generator (CVG) and an Aridus3 nebulizer for the respective Hg and Tl introduction.…”

Section: Hg Isotopes Analysismentioning

confidence: 99%

Mercury isotopic compositions in fine particles and offshore surface seawater in a coastal area of East China: implications for Hg sources and atmospheric transformations

Shi

Zhang

et al. 2021

Atmos. Chem. Phys.

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Abstract. Isotopic compositions of Mercury (Hg) in atmospheric particles (HgPM) are probably the mixed results of emission sources and atmospheric processes. Here, we present Hg isotopic compositions in daily fine particles (PM2.5) collected from an industrial site (Chunxiao – CX) and a nearby mountain site (Daimeishan – DMS) in a coastal area of East China, and in surface seawater close to the industrial area, to reveal the influence of anthropogenic emission sources and atmospheric transformations on Hg isotopes. The PM2.5 samples displayed a significant spatial difference in δ202Hg. For the CX site, the negative δ202Hg values are similar to those of source materials, and the HgPM contents were well correlated with chemical tracers, indicating the dominant contributions of local industrial activities to HgPM2.5, whereas the observed positive δ202Hg at the DMS site was likely associated with regional emissions and extended atmospheric processes during transport. The Δ199Hg values in PM2.5 from the CX and DMS sites were comparably positive. The unity slope of Δ199Hg versus Δ201Hg over all data suggests that the odd mass independent fractionation (MIF) of HgPM2.5 was primarily induced by the photoreduction of Hg2+ in aerosols. The positive Δ200Hg values with a minor spatial difference were probably associated with the photooxidation of Hg0, which is generally enhanced in the coastal environment. Total Hg in offshore surface seawater was characterized by negative δ202Hg and near-zero Δ199Hg and Δ200Hg values, which are indistinguishable from Hg isotopes of source materials. Overall, the PM2.5 collected from industrial areas had comparable δ202Hg values but more positive Δ199Hg and Δ200Hg as compared to surface seawater. The results indicate that atmospheric transformations would induce the significant fractionation of Hg isotopes and obscure the Hg isotopic signatures of anthropogenic emissions.

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Distribution of mercury isotope signatures in Yundang Lagoon, Xiamen, China, after long-term interventions

Cited by 15 publications

References 80 publications

Demystifying mercury geochemistry in contaminated soil–groundwater systems with complementary mercury stable isotope, concentration, and speciation analyses

Demystifying mercury geochemistry in contaminated soil–groundwater systems with complementary mercury stable isotope, concentration, and speciation analyses

Legacy Mercury Re-emission and Subsurface Migration at Contaminated Sites Constrained by Hg Isotopes and Chemical Speciation

Mercury isotopic compositions in fine particles and offshore surface seawater in a coastal area of East China: implications for Hg sources and atmospheric transformations

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