Characteristics of atmospheric mercury deposition and size-fractionated particulate mercury in urban Nanjing, China

作者：Jialei Zhu, Tao Wang, R. W. Talbot, Huiting Mao, Xu Yang, Congbin Fu, Jianning Sun, Bingliang Zhuang, S. Li, Yunpeng Han, Min Xie · 发表于：Atmospheric chemistry and physics · 年份：2014 · DOI：10.5194/acp-14-2233-2014 · 被引用次数：69 · 研究领域：Mercury impact and mitigation studies、Air Quality and Health Impacts、Toxic Organic Pollutants Impact

Abstract. A comprehensive measurement study of mercury wet deposition and size-fractionated particulate mercury (HgP) concurrent with meteorological variables was conducted from June 2011 to February 2012 to evaluate the characteristics of mercury deposition and particulate mercury in urban Nanjing, China. The volume-weighted mean (VWM) concentration of mercury in rainwater was 52.9 ng L−1 with a range of 46.3–63.6 ng L−1. The wet deposition per unit area was averaged 56.5 μg m−2 over 9 months, which was lower than that in most Chinese cities, but much higher than annual deposition in urban North America and Japan. The wet deposition flux exhibited obvious seasonal variation strongly linked with the amount of precipitation. Wet deposition in summer contributed more than 80% to the total amount. A part of contribution to wet deposition of mercury from anthropogenic sources was evidenced by the association between wet deposition and sulfates, as well as nitrates in rainwater. The ions correlated most significantly with mercury were formate, calcium, and potassium, which suggested that natural sources including vegetation and resuspended soil should be considered as an important factor to affect the wet deposition of mercury in Nanjing. The average HgP concentration was 1.10 ± 0.57 ng m−3. A distinct seasonal distribution of HgP concentrations was found to be higher in winter as a result of an increase in the PM10 concentration. Overall, more than half of the HgP existed in the ...