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Abstract
The current study was aimed to investigate the mercury pollution in urban road runoff. A total of 34 rainfall events were monitored on 5 independent road catchments from 2015 to 2016 in Nanjing city, China. Events mean concentrations of mercury and the impact factors of mercury pollution in urban road runoff were also carried out in the current study. Results revealed that the concentration of various mercury species was very high. Total mercury, dissolved mercury and particulate mercury were found to be in the range of 0.173–8.254 μg/L, 0.069–6.823 μg/L, and 0.086–2.485 μg/L, respectively. The order of total mercury concentration among the five catchments was as follows: Longpan road > Xinjiekou > Jiulonghu > Zhujiang road > Maqun area. Results revealed the existence of different dominant species of mercury in different urban areas. Particularly, mercury in urban road runoff mainly existed in particulate form in Maqun area, and the concentrations of inactive mercury (0.250–2.821 μg/L) were far more than that of volatile mercury (0.023–0.215 μg/L) and active mercury (0.026–0.359 μg/L). The order of impact factors of rainfall characteristics on Hg pollution in runoff was dry periods > runoff time > duration of rainfall > storm intensity > rainfall. Analysis based on the first flush effect showed that the first flush phenomenon of mercury was not significant.
Highlights
Mercury (Hg) is a global pollutant which is accumulated in the long term through natural and anthropogenic activities in the environment in organic or inorganic form [1,2,3]
The data revealed that the concentrations of Hg in different forms varied greatly over 34 rainfall events, ranging from 0.173 to 8.254 μg/L for total Hg (THg), from 0.069 to 6.823 μg/L for dissolved Hg (DHg), and from 0.086 to 2.485 μg/L for PHg, respectively
The current study revealed different results because the samples analyzed were all collected from urban road runoff, where the biological absorption and accumulation are not obvious
Summary
Mercury (Hg) is a global pollutant which is accumulated in the long term through natural and anthropogenic activities in the environment in organic or inorganic form [1,2,3]. As a kind of non-biological metabolism of toxic heavy metals, Hg in low concentrations is still seriously harmful to the natural environment and human health [4]. Natural sources mainly include volcanic, forest fire, soil and water Hg release [5], whereas anthropogenic sources include traffic activities, ore smelting, garbage incineration and fossil fuel combustion, etc. Mercury has drawn global attention due to its ability to contaminate entire water bodies from remote non-point source trace level inputs that bio-accumulate through the food
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