Domestic and Transboundary Sources of Atmospheric Particulate Bound Mercury in Remote Areas of China: Evidence from Mercury Isotopes

Mercury(编程语言) 中国 微粒 环境科学 污染 自然地理学 航程(航空) 海洋学 地理 气候学 大气科学 空气污染 地质学 生态学 程序设计语言 材料科学 考古 复合材料 生物 计算机科学
作者
Xuewu Fu,Hui Zhang,Xinbin Feng,Qingyou Tan,Lili Ming,Chen Liu,Leiming Zhang
出处
期刊:Environmental Science & Technology [American Chemical Society]
卷期号:53 (4): 1947-1957 被引量:79
标识
DOI:10.1021/acs.est.8b06736
摘要

Isotopic composition of atmospheric particulate bound mercury (PBM) was obtained at four remote sites in different geographical regions of China for three to 12 month periods. Mean (±1σ) Δ199HgPBM was the highest at the site in southwestern China (0.66 ± 0.32‰), followed by the site in northeastern China (0.36 ± 0.34‰), the site in the marine boundary layer of East China Sea (0.35 ± 0.33‰), and was the lowest at the site in northwestern China (0.27 ± 0.22‰). Δ199HgPBM was relatively higher in cold than warm season at the sites in northwestern and southwestern China, whereas the opposite was found at the site in northeastern China. We propose that the seasonal variations of Δ199HgPBM were influenced by the exposure of air masses to regional (e.g., anthropogenic and dust related) and long-range (e.g., anthropogenic and oceanic) sources in the preceding several days, with the former characterized by lower Δ199HgPBM and the latter characterized by more positive Δ199HgPBM due to sufficient atmospheric transformations. Modeling results from Potential Source Contribution Function suggested that domestic anthropogenic emission was the major contributor to PBM pollution at the sites in northeastern and eastern China, whereas long-range transboundary transport of PBM from South Asia played a more important role at the sites in southwestern and northwestern China.
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