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• W2076125035 startingPage "709" @default.
• W2076125035 abstract "The potential for exploitation of urban aquifers is partly dependent on understanding the distribution and fate of urban N sources, such as sewage and fertilisers, that can limit the use of groundwater for public supplies. To investigate the application of the dual-isotope approach to understanding the N hydrochemistry of urban groundwater, this paper presents δ15N–NO3− and δ18O–NO3− data collected from two multi-level piezometers in the Sherwood sandstone aquifer beneath Nottingham in the English Midlands, UK. At one multi-level piezometer (Old Basford), depth sample measurements of δ15N–NO3− in the range +9.2 to +11.4 ‰ and δ18O–NO3− in the range +8.2 to +10.9‰, together with NO3− nitrate concentrations from 31.7 to 66.7 mg/l, are evidence for nitrification of sewage-derived inputs. In contrast, at the other multi-level piezometer (the Meadows), isotopically enriched samples (δ15N–NO3− in the range +24.3 to +42.2 ‰ and δ18O–NO3− in the range +20.5 to +29.4‰) are evidence for denitrification, although the compositional range of δ15N–NO3− does not identify the N source without corroborating data. For the Meadows location, a cross-plot of δ15N–NO3− versus δ18O–NO3− gave an enrichment of the 15N isotope relative to the 18O isotope by a factor of 1.9, within the range of 1.3–2.1 reported for denitrification in other studies. This study has shown that the dual-isotope approach provides improved understanding of N sources and fate in the urban environment but further work is required to identify nitrification pathways to provide more confidence in the application and interpretation of δ18O–NO3− measurements." @default.
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• W2076125035 date "2004-05-01" @default.
• W2076125035 modified "2023-10-10" @default.
• W2076125035 title "A dual-isotope approach to the nitrogen hydrochemistry of an urban aquifer" @default.
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• W2076125035 doi "https://doi.org/10.1016/j.apgeochem.2003.11.001" @default.
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