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dc.contributor.authorKumar, B.S.K.
dc.contributor.authorSridevi, B.
dc.contributor.authorSarma, V.V.S.S.
dc.contributor.authorCardinal, D.
dc.contributor.authorSebilo, M.
dc.date.accessioned2024-10-03
dc.date.accessioned2025-02-11T11:21:20Z
dc.date.available2024-08-09
dc.date.available2025-02-11T11:21:20Z
dc.date.issued2024
dc.identifier.citationACS Environmental Science & Technology- Water, vol.4(8); 2024; 3521-3531
dc.identifier.issn2690-0637
dc.identifier.otherhttps://pubs.acs.org/doi/abs/10.1021/acsestwater.4c00338
dc.identifier.urihttps://doi.org/10.1021/ACSESTWATER.4C00338
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9376
dc.descriptionIF2023= 4.8
dc.description.abstractNitrate is accumulated in the groundwater, modified through nitrification/denitrification, and exchanged with coastal/estuarine water bodies. To examine the sources and modifications of nitrate, the concentrations and isotopic composition of nitrate (? 15N and ? 18ONO3) in the groundwater was monitored at 5 locations along the bank of Godavari estuary and in the estuarine waters for 7 months during wet (August-November) and dry (March-May) periods. Though the concentration of nitrate (NO3-) was higher during the wet than dry periods in both the groundwater and estuary, insignificant seasonal variability was observed in ?15N and ?18ONO3 indicating homogenization through mineralization-immobilization turnover of NO3-. The range of ?15N to ?18O of NO3- indicates soil, manure, and septic waste may be the major source of NO3-. The mean ratio of ?15N/?18O of 1.1 0.3 indicates the occurrence of denitrification in the groundwater. Concentrations ?15NNO3 and ?18ONO3 of NO3- displayed a significant relation between groundwater and estuarine water suggesting that NO3- is possibly denitrified. This study suggests that denitrified NO3- (enriched ?15N and ?18O) reported in the Godavari estuary may be contributed through submarine groundwater discharge than it is hypothesized to flux from the watershed.
dc.languageen
dc.publisherAmerican Chemical Society
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleIsotopic evidence of denitrified nitrate in groundwater beneath intensive agriculture and exchange with estuary (Godavari, India)
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Visakhapatnam, Andhra Pradesh, India


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