Mercury concentration and isotopic composition on different atmospheric particles (PM10 and PM2.5) in the subtropical coastal suburb of Xiamen Bay, Southern China

Sun, Lumin; Zhang, Xiaodan; Zheng, Jiayi; Zheng, Yue; Yuan, Dongxing; Chen, Weijia

doi:10.1016/j.atmosenv.2021.118604

Cited by 16 publications

(8 citation statements)

References 85 publications

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“…Most physical and chemical processes lead to MDF, but odd-MIF is mainly produced by photochemical reactions (e.g. photoreduction of aqueous Hg(II), photodemethylation of methylmercury). − Even-MIF is mainly observed in atmospheric samples, and its mechanism may be attributed to atmospheric redox processes. − Previous studies have reported Hg isotopes of PBM in different regions (e.g., urban, rural, and coastal areas) ,− and seasonal even diurnal variation of odd-MIF ,, and indicate that the isotopic compositions of PBM emitted from primary sources would be modified during atmospheric transformation or transportation. However, the mechanism that drives Hg isotope variations of PBM is still poorly understood, especially during the transformations of PBM in severe haze events.…”

Section: Introductionmentioning

confidence: 99%

Stable Isotopes Reveal Photoreduction of Particle-Bound Mercury Driven by Water-Soluble Organic Carbon during Severe Haze

Zhang

Zheng

Sun

et al. 2022

Environ. Sci. Technol.

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Haze with high loading of particles may result in significant enrichment of particle-bound Hg (PBM), potentially impacting the atmospheric Hg transformation and transport. However, the dynamics of Hg transformation and the relative environmental effect during severe haze episodes remain unclear. Here, we report Hg isotopic compositions of atmospheric particles (PM 2.5 , PM 10 , and TSP) collected during a severe haze episode in Tianjin, China, to investigate the transformation and fate of Hg during haze events. All severe haze samples display significantly higher Δ 199 Hg (up to 1.50‰) than global urban PBM, which cannot be explained by primary anthropogenic emissions. The high Δ 199 Hg is likely caused by photoreduction of PBM promoted by water-soluble organic carbon (WSOC) during the particle accumulation period, as demonstrated by the positive correlations of Δ 199 Hg with WSOC and relative humidity and confirmed by our laboratory-controlled photoreduction experiment. The results show that, on average, 21% of PBM are likely photoreduced and re-emitted back to the atmosphere as Hg(0), potentially requiring revision of atmospheric Hg budgeting and modeling. This study highlights the release of large portions of PBM back to the gas phase through photoreduction, which needs to be taken into account while evaluating the atmospheric Hg cycle and the relative ecological effects.

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Section: Introductionmentioning

confidence: 99%

Stable Isotopes Reveal Photoreduction of Particle-Bound Mercury Driven by Water-Soluble Organic Carbon during Severe Haze

Zhang

Zheng

Sun

et al. 2022

Environ. Sci. Technol.

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“…Linear correlations of Hg concentrations and Hg isotope values in PBM samples: (A) Hg concentrations vs δ 202 Hg, (B) Hg concentrations vs Δ 199 Hg, (C) δ 202 Hg vs Δ 199 Hg, (D) Δ 200 Hg vs Δ 199 Hg, (E) Δ 201 Hg vs Δ 199 Hg, and (F) Δ 204 Hg vs Δ 200 Hg. Also plotted are the Hg isotope compositions of PBM from background sites (all China, forested mountains) ,, and urban/industrial sites. ,− Given that our studied sites are located inland, PBM data from coastal/offshore and polar sites are not shown. The error bars for our studied samples denote the 2SD analytic uncertainties; the error bars for cited data denote the 1SD uncertainties of site-specific mean values.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Atmospheric samples, including TGM (typically used to represent GEM) ,− ,− and PBM of different particulate sizes (TSP, PM 10 , and PM 2.5 ), − ,,,,− that were collected from diverse regions (urban/industrial, rural/background, and coastal/offshore sites) have been reported for Hg isotope compositions. TGM samples collected at inland background sites (e.g., forested mountains) far from the urban/industrial centers and tectonically active regions (e.g., volcanos and faults) are commonly characterized by positive δ 202 Hg (−0.16 to 1.19‰, site-specific mean values) and slightly negative Δ 199 Hg (−0.28 to −0.05‰) and Δ 200 Hg (−0.11 to −0.02‰) values (Figure ).…”

Section: Results and Discussionmentioning

confidence: 99%

Atmospheric Mercury Isotope Shifts in Response to Mercury Emissions from Underground Coal Fires

Sun

Cao

Dai

et al. 2023

Environ. Sci. Technol.

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Pollutant emissions from coal fires have caused serious concerns in major coal-producing countries. Great efforts have been devoted to suppressing them in China, notably at the notorious Wuda Coalfield in Inner Mongolia. Recent surveys revealed that while fires in this coalfield have been nearly extinguished near the surface, they persist underground. However, the impacts of Hg volatilized from underground coal fires remain unclear. Here, we measured concentrations and isotope compositions of atmospheric Hg in both gaseous and particulate phases at an urban site near the Wuda Coalfield. The atmospheric Hg displayed strong seasonality in terms of both Hg concentrations (5−7-fold higher in fall than in winter) and isotope compositions. Combining characteristic isotope compositions of potential Hg sources and air mass trajectories, we conclude that underground coal fires were still emitting large amounts of Hg into the atmosphere that have been transported to the adjacent urban area in the prevailing downwind direction. The other local anthropogenic Hg emissions were only evident in the urban atmosphere when the arriving air masses did not pass directly through the coalfield. Our study demonstrates that atmospheric Hg isotope measurement is a useful tool for detecting concealed underground coal fires.

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“…Wet deposition of iHg through atmospheric precipitation could be an important source of positive odd Hg MIF, which has an overall global mean Δ 199 Hg of 0.41‰ (Yin et al 2018;Jiskra et al 2021). Particle bound Hg from coastal marine boundary layers in the Northern Hemisphere, which has Δ 199 Hg values of 0.35-0.4‰ (Rolison et al 2013;Fu et al 2019;Yu et al 2020;Qiu et al 2021;Sun et al 2021), may also be an important proximal source of iHg with positive odd MIF to the WPO. Note that the Δ 199 Hg/Δ 201 Hg slopes of both oceanic precipitation and particle bound Hg in the atmosphere from coastal regions are $ 1.0, similar to that in adult PBT from the WPO.…”

Section: Sources Of Hg To Adult Pbtmentioning

confidence: 99%

Mercury stable isotopes reveal sources of methylmercury and prey in giant Pacific bluefin tuna from the western North Pacific Ocean

Chen

Ang

et al. 2023

Limnol Oceanogr Letters

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Pacific bluefin tuna (PBT) is a long-lived, migratory apex predator that travels across vast areas of the North Pacific Ocean. Concentrations of the neurotoxin methylmercury (MeHg) are high in large PBT and increase with fish age. Mercury stable isotope ratios recorded in PBT muscle tissue show a major shift in the source of MeHg between juvenile PBT in the eastern North Pacific Ocean reported in a previous study and adult PBT (age 5 to more than 27 yr) from the west. In addition, a gradual increase in the accumulation of MeHg from epipelagic prey from the Kuroshio extension in adult PBT as they grow was observed. Finally, MeHg stable isotopes indicate that MeHg in the western North Pacific Ocean has a different source or undergoes different transformations before entering the oceanic food web than in the central and eastern North Pacific. These findings may help identify the source of the high concentrations of MeHg in PBT and other top predators from the western North Pacific Ocean.

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Mercury concentration and isotopic composition on different atmospheric particles (PM10 and PM2.5) in the subtropical coastal suburb of Xiamen Bay, Southern China

Cited by 16 publications

References 85 publications

Stable Isotopes Reveal Photoreduction of Particle-Bound Mercury Driven by Water-Soluble Organic Carbon during Severe Haze

Stable Isotopes Reveal Photoreduction of Particle-Bound Mercury Driven by Water-Soluble Organic Carbon during Severe Haze

Atmospheric Mercury Isotope Shifts in Response to Mercury Emissions from Underground Coal Fires

Mercury stable isotopes reveal sources of methylmercury and prey in giant Pacific bluefin tuna from the western North Pacific Ocean

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