Abstract
The concentrations of pollutants in precipitation are indicators of their abundance in the atmosphere. The deposition of heavy metals and inorganic reactive nitrogen (Nr) through precipitation was assessed for monsoon season in Delhi, India. The wet deposition fluxes for heavy metals followed the order, Hg < Cu < Zn < Co < Ba < Cd < Ag < As < Mn < Cr < Fe < Pb < Ni < Al and for Nr followed the order, NO3− < NH4+. Fractional acidity and ammonia availability index indicated that acidity in the precipitation was effectively neutralized by alkaline species. Furthermore, enrichment factor of heavy metals indicated that rainfall was contaminated with Cd and Hg (EF > 10,000) showing maximum enrichments among all the studied heavy metals. CWT analysis for monsoon season showed more than 70% of contributions by air trajectories passing over the densely populated northeastern IGP region for all the observed heavy metals and inorganic reactive nitrogen species. Correlation and PCA analysis showed that abundant metals such as Al, Fe and Mn were mainly of crustal origin, whereas rest of the heavy metals showed anthropogenic contributions from vehicles, industries, fossil fuels, biomass burning, etc. Availability of quality deposition data is of utmost importance in South Asia due to rapid economic growth and prevailing data gaps in this region. Wet scavenging of trace metals could also be useful in exploring basic information for evaluation of toxic potential of non-essential trace metals and their associated human health risks due to domestic use and consumption of rainwater.
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Data availability
The datasets generated and analyzed during the current study are available with the corresponding author on reasonable request.
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Acknowledgements
Authors acknowledge Jawaharlal Nehru University for providing the infrastructure to carry out this study. We are extremely thankful for the financial support from UKRI GCRF South Asian Nitrogen Hub. This study is a part of DRS-Net (Deposition Research Network through students)-India.
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Financial support from UKRI GCRF SANH is gratefully acknowledged for this study.
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AK contributed to sample collection, heavy metal analysis, data compilation, interpretation & visualization and writing of the manuscript. SY contributed to mercury analysis and writing. YS contributed to ion chromatography analysis. UK contributed to conceptualization, funding acquisition, review and editing of the manuscript.
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Katoch, A., Yadav, S., Singh, Y. et al. Wet scavenging of trace metals and reactive nitrogen in Delhi, India. Int. J. Environ. Sci. Technol. 21, 2897–2912 (2024). https://doi.org/10.1007/s13762-023-05097-z
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DOI: https://doi.org/10.1007/s13762-023-05097-z