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• W4233764186 abstract "Abstract. The usefulness of mercury (Hg) isotopes for tracing the sources and pathways of Hg (and its vectors) in atmospheric fine particles (PM2.5) is uncertain. Here, we measured Hg isotopic compositions in 30 potential source materials and 23 PM2.5 samples collected in four seasons from the megacity Beijing (China), and combined the seasonal variation of both mass-dependent fractionation (represented by the ratio 202Hg/198Hg, δ202Hg) and mass-independent fractionation of isotopes with odd and even mass numbers (represented by Δ199Hg and Δ200Hg, respectively) with geochemical parameters and meteorological data to identify the sources of PM2.5-Hg and possible atmospheric particulate Hg transformation. All PM2.5 samples were strongly enriched in Hg and other heavy metals, and displayed large ranges of both δ202Hg (−2.18 to 0.51 ‰) and Δ199Hg (−0.53 to 0.57 ‰), and small positive Δ200Hg (0.02 to 0.17 ‰). The results indicated that the seasonal variation of Hg isotopic composition (and elemental concentrations) was likely derived from variable contributions from the anthropogenic sources, with continuous input due to industrial activities (e.g. smelting, cement production and coal combustion) in all seasons, while coal combustion dominated in Winter and biomass burning mainly in Autumn. The significant positive Δ199Hg of PM2.5-Hg in Spring and early Summer was likely derived from long-range transported Hg that had undergone extensive photochemical reduction. The study demonstrated that Hg isotopes are a powerful tool for tracing the sources of particulate Hg and its vectors in the atmosphere." @default.
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• W4233764186 date "2016-06-08" @default.
• W4233764186 modified "2023-10-17" @default.
• W4233764186 title "Isotopic composition for source identification of mercury in atmospheric fine particles" @default.
• W4233764186 doi "https://doi.org/10.5194/acp-2016-363" @default.
• W4233764186 hasPublicationYear "2016" @default.
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