EGU21-9103, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-9103
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Wet Deposition Fluxes of Nitrate and Ammonium at a Rural Agricultural Site in north India

Sudesh Yadav and Umesh Kulshrestha
Sudesh Yadav and Umesh Kulshrestha
  • Jawaharlal Nehru University, JNU, New Delhi, School of Environmental Sciences, New Delhi, India (sudeshyadav1902@gmail.com)

The chemical composition of rainwater is an indicator of the air quality and sources of influence. In this study, pH and ionic concentrations were measured in rain samples collected during monsoon season of 2018 at a rural agricultural site located in northern part of India. Wet deposition fluxes of reactive nitrogen species NH4+ over NO3- were calculated to estimate their annual deposition. The pH of samples varied between 5.2 and 6.14, with an average value of 5.72 which is in alkaline range considering 5.6 as the neutral pH of cloud water with atmospheric CO2 equilibrium. These relatively high pH values indicate the neutralisation of acidity in precipitation. Samples were analysed for their cationic and anionic content using ion chromatography. The results showed that NH4+ concentrations were higher than NO3- with the VWM concentrations of 187.23 μeql-1 and 26.79 μeql-1 respectively. Furthermore, wet deposition flux of NH4+-N was calculated as 4.25 kg ha-1 yr-1 while that of NO3--N was as 2.10 kg ha-1 yr-1. VWM concentrations of major ions decreased in the following order NH4+ > Ca2+ > SO42- > NO3- > K+ > Cl- > Na+ > Mg2+. In this study, relatively high NH4+ concentrations in rainwater can be attributed to nearby agricultural activities, excreta and biomass burning.

Keywords: Rainwater, Neutralisation, VWM concentration, Agricultural site, Reactive Nitrogen.

How to cite: Yadav, S. and Kulshrestha, U.: Wet Deposition Fluxes of Nitrate and Ammonium at a Rural Agricultural Site in north India, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-9103, https://doi.org/10.5194/egusphere-egu21-9103, 2021.

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