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Water 2017, 9(10), 779;

Study on Mercury Distribution and Speciation in Urban Road Runoff in Nanjing City, China

School of Civil Engineering, Southeast University, Sipai Lou 2#, Nanjing 210096, China
Southeast University-Monash University Joint Research Centre for Water Sensitive Cities, Nanjing 210096, China
Authors to whom correspondence should be addressed.
Received: 7 September 2017 / Revised: 22 September 2017 / Accepted: 2 October 2017 / Published: 12 October 2017
(This article belongs to the Special Issue Sponge Cities: Emerging Approaches, Challenges and Opportunities)
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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. View Full-Text
Keywords: mercury species; urban road runoff; events mean concentrations (EMCs); water pollution; first flush mercury species; urban road runoff; events mean concentrations (EMCs); water pollution; first flush

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Singh, R.P.; Wu, J.; Kumar, A.J.; Fu, D. Study on Mercury Distribution and Speciation in Urban Road Runoff in Nanjing City, China. Water 2017, 9, 779.

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