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• W3037419864 endingPage "140374" @default.
• W3037419864 startingPage "140374" @default.
• W3037419864 abstract "Nitrate (NO3-) is one of the most widespread contaminants in groundwater primarily due to agricultural activities utilizing N-containing fertilizers and the presence of animal wastes. Hydrochemical and nitrate isotope data (δ15N-NO3- and δ18O-NO3-) from the unconfined aquifer in the urban area of Del Campillo city and its surrounding rural area with different land-use types, i.e. individual sanitation systems, agricultural areas and livestock breeding facilities, were generated to investigate the impact of nitrogen pollution sources and to assess N-biogeochemical processes. The Principal Component Analysis of hydrochemical and isotopic data were used to compare the factors that control the groundwater quality and particularly the nitrate concentrations in the urban and the rural area. The results showed that nitrate pollution in the urban area of Del Campillo city originated mainly from the on-site sanitation systems and/or animal domestic wastes, whereas in the rural area nitrate pollution was mostly attributed to a combination of urea-based fertilizers and manure from livestock breeding activities. The aquifer is under oxic to suboxic conditions in the rural area and becomes suboxic in the urban area where the higher supply of organic matter consumes oxygen. As a result, denitrification was more significant in the urban area compared to the rural area, as evidenced by the higher N and O isotope enrichment factor (ε). This work will be used to benchmark the current nitrate contamination status in the region and evaluate effective planning of environmental measures and remediation strategies." @default.
• W3037419864 created "2020-07-02" @default.
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• W3037419864 date "2020-11-01" @default.
• W3037419864 modified "2023-10-16" @default.
• W3037419864 title "Comparative evaluation of urban versus agricultural nitrate sources and sinks in an unconfined aquifer by isotopic and multivariate analyses" @default.
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• W3037419864 doi "https://doi.org/10.1016/j.scitotenv.2020.140374" @default.
• W3037419864 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32886971" @default.
• W3037419864 hasPublicationYear "2020" @default.
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