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• W4286751454 endingPage "157345" @default.
• W4286751454 startingPage "157345" @default.
• W4286751454 abstract "Recently, the subsoils of ephemeral stream (arroyos) floodplains in the northern Chihuahuan Desert were discovered to contain large naturally occurring NO3- reservoirs (floodplain: ~38,000 kg NO3-N/ha; background: ~60 kg NO3-N/ha). These reservoirs may be mobilized through land use change or natural stream channel migration which makes differentiating between anthropogenic and natural groundwater NO3- sources challenging. In this study, the fate and sources of NO3- were investigated in an area with multiple NO3- sources such as accidental sewer line releases and sewage lagoons as well as natural reservoirs of subsoil NO3-. To differentiate sources, this study used a large suite of geochemical tools including δ15N[NO3], δ18O[NO3], δ15N[N2], δ13C[DIC], 14C, tritium (3H), dissolved gas concentrations, major ion chemistry, and contaminants of emerging concern (CEC) including artificial sweeteners. NO3- at sites with the highest concentrations (25 to 229 mg/L NO3-N) were determined to be largely sourced from naturally occurring subsoil NO3- based on δ15N[NO3] (<8 ‰) and mass ratios of Cl-/Br- (〈100) and NO3-/Cl- (>1.5). Anthropogenic NO3- was deciphered using mass ratios of Cl-/Br- (>120) and NO3-/Cl- (<1), δ15N[NO3] (>8 ‰), and CEC detections. Nitrogen isotope analyses indicated that denitrification is fairly limited in the field area. CEC were detected at 67 % of sites including 3H dead sites (<1 pCi/L) with low percent modern carbon-14 (PMC; <30 %). Local supply wells are 3H dead with low PMC; as 3H does not re-equilibrate and 14C is very slow to re-equilibrate during recirculation through infrastructure, sites with low PMC, 3H < 1 pCi/L, and CEC detections were interpreted as locations with substantial anthropogenic groundwater recharge. Neotame was used to identify locations of very recent (<15 years before present) or ongoing wastewater influxes to the aquifer. This work shows the important influence of naturally occurring subsoil NO3- reservoirs on groundwater in arid regions and the major contribution of artificial recharge." @default.
• W4286751454 created "2022-07-23" @default.
• W4286751454 creator A5036296516 @default.
• W4286751454 date "2022-11-01" @default.
• W4286751454 modified "2023-10-17" @default.
• W4286751454 title "Deciphering natural and anthropogenic nitrate and recharge sources in arid region groundwater" @default.
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• W4286751454 doi "https://doi.org/10.1016/j.scitotenv.2022.157345" @default.
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• W4286751454 hasPublicationYear "2022" @default.
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