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Source characterization and human health risk assessment of nitrate in groundwater of middle Gangetic Plain, India

  • Deepak KumarEmail author
  • Anshuman Singh
  • Rishi Kumar Jha
  • Bibhuti Bhushan Sahoo
  • Sunil Kumar Sahoo
  • Vivekanand Jha
Original Paper
  • 35 Downloads

Abstract

Nitrate (\( {\mathrm{NO}}_3^{-} \)) pollution is a global concern as it affects the whole ecosystem: human, livestock, economy, and environment. The elevated levels of nitrate in groundwater can directly pose risks to population. A total of 156 representative groundwater samples were collected from groundwater sources such as hand pumps and bore wells across the study area. To identify the source of nitrate with its associated attributes, multivariate statistical methods (factor analysis (FA), sparse principal component analysis (SPCA)) were used in this study. In addition, empirical Bayesian kriging (EBK) modeling was used to predict the nitrate at ungauged locations of the study area. From the analysis of results, it was found that 5% of the groundwater samples exceeded the acceptable limit (50 mg l−1) of nitrate as specified by the World Health Organization (WHO). The first principal component (PC) indicated by the SPCA was salinity factor, which was significantly contributed by electrical conductivity followed by sulfate. The fourth PC represented the nitrate as a factor and positive loading of nitrate was strongly associated with chloride, sulfate, and calcium. The associated loading of nitrate with water quality attributes indicated that elevated level of nitrate in groundwater may be due to external sources that came through anthropogenic activity. A similar conclusion was drawn from factor analysis as well, indicating that SPCA can be applied as a new method for groundwater geochemistry. Hazard index calculations showed that infants of the study region were at a higher risk compared to the adults and children.

Keywords

Groundwater Nitrate Health risk Groundwater quality Groundwater pollution Gaya 

Notes

Acknowledgments

The authors are profoundly grateful to the reviewers and the associate editor for the careful examination of the draft of the manuscript and their many valuable comments and suggestions to help improve the manuscript.

Funding information

This work was supported by the Board of Research and Nuclear Sciences under Department of Atomic Energy, India, for providing financial assistance under the National Uranium project (NUP) (BRNS Project Ref. No.: 36(4)/14/10/2014-BRNS).

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.Department of Civil EngineeringNational Institute of TechnologyPatnaIndia
  2. 2.Department of MathematicsNational Institute of TechnologyPatnaIndia
  3. 3.Environmental Assessment DivisionBhabha Atomic Research CentreMumbaiIndia

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