Journal
ENVIRONMENTAL POLLUTION
Volume 218, Issue -, Pages 259-268Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2016.06.073
Keywords
Atmospheric mercury; PM2.5; Pollution characteristics; Source identification; Coastal area
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Funding
- Key Research Program of Chinese Academy of Sciences [KJZDEW-TZ-G06-02]
- National Natural Science Foundation of China [U1405235, 41303072, 41575146, 21507127]
- Natural Science Foundation of Fujian Province, China [2016J01201]
- Knowledge Innovation Program of Chinese Academy of Sciences [IUEZD201403]
- State Environmental Protection Key Laboratory of the Cause and Prevention of Urban Air Pollution Complex [CX201510(b)]
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Measurement of atmospheric mercury speciation was conducted in a coastal city of the Yangtze River Delta, China from July 2013 to January 2014, in conjunction with air pollutants and meteorological parameters. The mean concentrations of gaseous elemental mercury (GEM), particulate bound mercury (HgP) and reactive gaseous mercury (RGM) were 3.26 +/- 1.63 ng m(-3), 659 +/- 931 pg m(-3), and 197 246 pg m-3, respectively. High percentages of HgP during haze days were found, due to the increase in direct emissions and gas-particle partitioning of RGM. The average gas-particle partitioning coefficients (Kp) during moderate or severe haze days (PM2.5 > 150 mu g m(-3)) were obviously decreased. GEM and HgP were positively correlated with PM2.5, SO2, NO2 and CO, suggesting a significant contribution of anthropogenic sources. Elevated HgP concentrations in cold seasons and in the morning were observed while RGM exhibited different seasonal and diurnal pattern. The ratio of HgP/SO2 and Pearson correlation analysis suggested that coal combustion was the main cause of increasing atmospheric Hg concentrations. The monitoring site was affected by local, regional and interregional sources. The back trajectory analysis suggested that air mass from northwest China and Huabei Plain contributed to elevated atmospheric Hg in winter and autumn, while southeast China with clean air masses were the major contributor in summer. (C) 2016 Elsevier Ltd. All rights reserved.
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