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元素汞的近地表氧化导致北冰洋生物群中的汞暴露。

Near surface oxidation of elemental mercury leads to mercury exposure in the Arctic Ocean biota.

作者信息

Lim Seung Hyeon, Kim Younggwang, Motta Laura C, Yang Eun Jin, Rhee Tae Siek, Hong Jong Kuk, Han Seunghee, Kwon Sae Yun

机构信息

Division of Environmental Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang, 37673, Republic of Korea.

Marine Chemistry & Geochemistry, Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, MA, 02543, USA.

出版信息

Nat Commun. 2024 Aug 31;15(1):7598. doi: 10.1038/s41467-024-51852-2.

DOI:10.1038/s41467-024-51852-2
PMID:39217169
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11365953/
Abstract

Atmospheric mercury (Hg(0), Hg(II)) and riverine exported Hg (Hg(II)) are proposed as important Hg sources to the Arctic Ocean. As plankton cannot passively uptake Hg(0), gaseous Hg(0) has to be oxidized to be bioavailable. Here, we measured Hg isotope ratios in zooplankton, Arctic cod, total gaseous Hg, sediment, seawater, and snowpack from the Bering Strait, the Chukchi Sea, and the Beaufort Sea. The ΔHg, used to differentiate between Hg(0) and Hg(II), shows, on average, 70% of Hg(0) in all biota and differs with seawater ΔHg (Hg(II)). Since ΔHg anomalies occur via tropospheric Hg(0) oxidation, we propose that near-surface Hg(0) oxidation via terrestrial vegetation, coastally evaded halogens, and sea salt aerosols, which preserve ΔHg of Hg(0) upon oxidation, supply bioavailable Hg(II) pools in seawater. Our study highlights sources and pathways in which Hg(0) poses potential ecological risks to the Arctic Ocean biota.

摘要

大气汞（Hg(0)、Hg(II)）和河流输出汞（Hg(II)）被认为是北冰洋重要的汞源。由于浮游生物无法被动吸收Hg(0)，气态Hg(0)必须被氧化才能具有生物可利用性。在此，我们测量了白令海峡、楚科奇海和波弗特海的浮游动物、北极鳕鱼、总气态汞、沉积物、海水和积雪中的汞同位素比率。用于区分Hg(0)和Hg(II)的ΔHg平均显示，所有生物群中70%的汞为Hg(0)，且与海水ΔHg（Hg(II)）不同。由于ΔHg异常是通过对流层Hg(0)氧化产生的，我们提出通过陆地植被、沿海逸出的卤素和海盐气溶胶进行的近地表Hg(0)氧化，在氧化过程中保留了Hg(0)的ΔHg，为海水中具有生物可利用性的Hg(II)库提供了来源。我们的研究突出了Hg(0)对北冰洋生物群构成潜在生态风险的来源和途径。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9fbe/11365953/2288512ef1ae/41467_2024_51852_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9fbe/11365953/6f63f1365b96/41467_2024_51852_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9fbe/11365953/9c13bc8b2d04/41467_2024_51852_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9fbe/11365953/1ae00bf6d0a7/41467_2024_51852_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9fbe/11365953/2288512ef1ae/41467_2024_51852_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9fbe/11365953/6f63f1365b96/41467_2024_51852_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9fbe/11365953/9c13bc8b2d04/41467_2024_51852_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9fbe/11365953/1ae00bf6d0a7/41467_2024_51852_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9fbe/11365953/2288512ef1ae/41467_2024_51852_Fig4_HTML.jpg

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本文引用的文献

1
Mercury isotopic evidence for the importance of particles as a source of mercury to marine organisms.汞同位素证据表明颗粒物质是海洋生物汞的重要来源。
Proc Natl Acad Sci U S A. 2022 Nov;119(44):e2208183119. doi: 10.1073/pnas.2208183119. Epub 2022 Oct 24.
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Mercury isotope evidence for Arctic summertime re-emission of mercury from the cryosphere.汞同位素证据表明北极夏季冰原释放汞。
Nat Commun. 2022 Aug 24;13(1):4956. doi: 10.1038/s41467-022-32440-8.
3
Dissociation of Mercuric Oxides Drives Anomalous Isotope Fractionation during Net Photo-oxidation of Mercury Vapor in Air.
汞氧化物的离解驱动空气中汞蒸气净光氧化过程中异常同位素分馏。
Environ Sci Technol. 2022 Sep 20;56(18):13428-13438. doi: 10.1021/acs.est.2c02722. Epub 2022 Aug 12.
4
Internal Dynamics and Metabolism of Mercury in Biota: A Review of Insights from Mercury Stable Isotopes.生物体内汞的内动力学和代谢：汞稳定同位素研究的新认识。
Environ Sci Technol. 2022 Jul 5;56(13):9182-9195. doi: 10.1021/acs.est.1c08631. Epub 2022 Jun 19.
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Arctic atmospheric mercury: Sources and changes.北极大气汞：来源与变化。
Sci Total Environ. 2022 Sep 15;839:156213. doi: 10.1016/j.scitotenv.2022.156213. Epub 2022 May 24.
6
Updated trends for atmospheric mercury in the Arctic: 1995-2018.北极大气汞更新趋势：1995-2018 年。
Sci Total Environ. 2022 Sep 1;837:155802. doi: 10.1016/j.scitotenv.2022.155802. Epub 2022 May 10.
7
Toxicological risk of mercury for fish and invertebrate prey in the Arctic.北极地区汞对鱼类和无脊椎动物猎物的毒理学风险。
Sci Total Environ. 2022 Aug 25;836:155702. doi: 10.1016/j.scitotenv.2022.155702. Epub 2022 May 4.
8
What are the likely changes in mercury concentration in the Arctic atmosphere and ocean under future emissions scenarios?在未来的排放情景下，北极大气和海洋中汞浓度可能会发生什么变化？
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The impact of mercury contamination on human health in the Arctic: A state of the science review.汞污染对北极地区人类健康的影响：科学综述。
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