Mass-Independent Fractionation of Mercury Stable Isotopes Reveals Atmospheric Transport Impact on Particulate-Bound Mercury

文献类型： 外文期刊

第一作者： Qin, Xuechao

作者： Qin, Xuechao;Wei, Rongfei;Tao, Zhenghua;Guo, Qingjun;Qin, Xuechao;Dong, Xinyuan;Liu, Congqiang;Zhang, Hua;Guo, Qingjun

作者机构：

关键词： particulate-bound mercury; mercury isotopes; mass-independent fractionation; mercury pollution; atmosphere transport

期刊名称：GEOPHYSICAL RESEARCH LETTERS （ 影响因子：4.6； 五年影响因子：5.1 ）

ISSN： 0094-8276

年卷期： 2025 年 52 卷 17 期

页码：

收录情况： SCI

摘要： Atmospheric particulate-bound mercury (PBM), adsorbed onto aerosols like TSP and PM2.5 (PBMTSP and PBM2.5), is crucial to the Hg biogeochemical cycle. However, the mechanisms underlying the formation and transportation of PBM remain unclear. This study aims to explore these mechanisms by utilizing Hg isotopes and collecting PBMTSP and PBM2.5 samples at five distinct sites in North China. Both PBMTSP and PBM2.5 exhibited positive odd and even mass-independent fractionation (MIF), with Delta 199Hg values in PBM2.5 enriched by 0.25 +/- 0.35 parts per thousand relative to PBMTSP. The slopes between Delta 199Hg and Delta 201Hg, along with sulfur MIF and backward trajectories, suggest that intense photoreduction reactions during long-distance and high-altitude transport are the primary driver of the elevated Delta 199Hg in fine particulate matter. Importantly, significant positive MIF signatures can occur not only in remote areas but also in anthropogenic Hg emission regions, underscoring the underestimated role of atmospheric transport, particularly on clean days.

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