Junming Guo1, Kirpa Ram2,4, Lekhendra Tripathee This email address is being protected from spambots. You need JavaScript enabled to view it.1,5, Shichang Kang1,3,6, Jie Huang3,4, Pengfei Chen1, Prakriti Sharma Ghimire1,5

1 State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences (CAS), Lanzhou 730000, China
2 Institute of Environment and Sustainable Development, Banaras Hindu University, Varanasi-221005, U.P., India
3 CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100085, China
4 Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese, Academy of Sciences, Beijing 100101, China
5 Himalayan Environment Research Institute, Kathmandu, Nepal
6 University of Chinese Academy of Sciences, Beijing 100049, China


 

Received: March 16, 2020
Revised: June 6, 2020
Accepted: June 7, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.2019.12.0630 


Cite this article:

Guo, J., Ram, K., Tripathee, L., Kang, S, Huang, J., Chen, P. and Ghimire, P.S. (2020). Study on Mercury in PM10 at an Urban Site in the Central Indo-Gangetic Plain: Seasonal Variability and Influencing Factors. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.2019.12.0630


HIGHLIGHTS

  • Heavy HgP concentrations in aerosols of Kanpur.
  • Clear seasonal variation with highest HgP levels in March and winter.
  • Estimated dry deposition flux was 104.69 µg m2 yr1.
  • Attention should be paid to the influencing factors and sources of HgP in the IGP region.
 

ABSTRACT


Mercury (Hg) is among the most toxic metals possessing a major threat to human health and aquatic ecosystems over the globe. However, measurement of Hg concentrations and seasonal variability remain poorly understood over the Indo-Gangetic Plain (IGP) in northern India. In this study, we present one-year data of particulate-bound mercury (HgP) in aerosol samples (PM10) collected from Kanpur to understand seasonal variability and factors influencing concentration, as well as dry deposition flux. The HgP concentration exhibit a large temporal variability and ranged between 100 (on 14 June 2007) to 4340 pg m–3 (on 4 March 2007) with an annual average concentration of HgP is 776 ± 846 pg m–3. The HgP concentrations and HgP/PM10 ratios showed a marked seasonality with the highest in winter (Dec-Feb) followed by post-monsoon (Oct–Nov) and summer (April–June) seasons. HgP and HgP/PM10 were positively correlated (r2 = 0.77, p < 0.05, N = 58) during the sampling period and the estimated dry deposition flux of HgP was 104.7 µg m–2 y–1. Although this study provides a comprehensive data set on HgP in an urban atmosphere of the IGP revealing high levels of HgP, measurement of gaseous Hg is needed for estimation of the total Hg budget. Therefore, future studies should focus on identification of different sources as well as emission characteristics of all forms of Hg (organic and inorganic forms) for better mitigation strategy to prevent health risks associated with toxic Hg in the region.


Keywords: Particulate mercury; Aerosol; Dry deposition flux; Indo-Gangetic Plain; South Asia.



Aerosol Air Qual. Res. 20:-. https://doi.org/10.4209/aaqr.2019.12.0630 

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