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• W2037228023 abstract "The nitrogen and oxygen isotopic compositions of nitrate in pore water extracts from unsaturated zone (UZ) core samples and groundwater samples indicate at least four potential sources of nitrate in groundwaters at the U.S. DOE Hanford Site in south-central Washington. Natural sources of nitrate identified include microbially produced nitrate from the soil column (δ15N of 4−8‰, δ18O of −9 to 2‰) and nitrate in buried caliche layers (δ15N of 0−8‰, δ18O of −6 to 42‰). Isotopically distinct industrial sources of nitrate include nitric acid in low-level disposal waters (δ15N ≈ 0‰, δ18O ≈ 23‰) and co-contaminant nitrate in high-level radioactive waste from plutonium processing (δ15N of 8−33‰, δ18O of −9 to 7‰). The isotopic compositions of nitrate from 97 groundwater wells with concentrations up to 1290 mg/L NO3- have been analyzed. Stable isotope analyses from this study site, which has natural and industrial nitrate sources, provide a tool to distinguish nitrate sources in an unconfined aquifer where concentrations alone do not. These data indicate that the most common sources of high nitrate concentrations in groundwater at Hanford are nitric acid and natural nitrate flushed out of the UZ during disposal of low-level wastewater. Nitrate associated with high-level radioactive UZ contamination does not appear to be a major source of groundwater nitrate at this time." @default.
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• W2037228023 date "2005-04-15" @default.
• W2037228023 modified "2023-09-27" @default.
• W2037228023 title "Tracking Sources of Unsaturated Zone and Groundwater Nitrate Contamination Using Nitrogen and Oxygen Stable Isotopes at the Hanford Site, Washington" @default.
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• W2037228023 doi "https://doi.org/10.1021/es0481070" @default.
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