Anoxic nitrogen cycling in a hydrocarbon and ammonium contaminated aquifer
Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DI...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Wells, Naomi S. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2018transfer abstract |
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| Schlagwörter: |
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| Umfang: |
10 |
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| Übergeordnetes Werk: |
Enthalten in: Matches, mismatches and priorities of pathways from a climate-resilient development perspective in the mountains of Nepal - Pandey, Avash ELSEVIER, 2021, a journal of the International Association on Water Quality (IAWQ), Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:142 ; year:2018 ; day:1 ; month:10 ; pages:373-382 ; extent:10 |
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| DOI / URN: |
10.1016/j.watres.2018.06.005 |
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| 520 | |a Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. | ||
| 520 | |a Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. | ||
| 650 | 7 | |a Chemolithotrophic N cycling |2 Elsevier | |
| 650 | 7 | |a Biodegradation |2 Elsevier | |
| 650 | 7 | |a Nitrate dual isotopes |2 Elsevier | |
| 650 | 7 | |a Contaminated groundwater |2 Elsevier | |
| 650 | 7 | |a Stable isotopes |2 Elsevier | |
| 650 | 7 | |a Nitrite |2 Elsevier | |
| 700 | 1 | |a Kappelmeyer, Uwe |4 oth | |
| 700 | 1 | |a Knöller, Kay |4 oth | |
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10.1016/j.watres.2018.06.005 doi GBV00000000000665.pica (DE-627)ELV04369702X (ELSEVIER)S0043-1354(18)30449-4 DE-627 ger DE-627 rakwb eng 333.7 320 VZ Wells, Naomi S. verfasserin aut Anoxic nitrogen cycling in a hydrocarbon and ammonium contaminated aquifer 2018transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. Chemolithotrophic N cycling Elsevier Biodegradation Elsevier Nitrate dual isotopes Elsevier Contaminated groundwater Elsevier Stable isotopes Elsevier Nitrite Elsevier Kappelmeyer, Uwe oth Knöller, Kay oth Enthalten in Elsevier Science Pandey, Avash ELSEVIER Matches, mismatches and priorities of pathways from a climate-resilient development perspective in the mountains of Nepal 2021 a journal of the International Association on Water Quality (IAWQ) Amsterdam [u.a.] (DE-627)ELV006716016 volume:142 year:2018 day:1 month:10 pages:373-382 extent:10 https://doi.org/10.1016/j.watres.2018.06.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 142 2018 1 1001 373-382 10 |
| spelling |
10.1016/j.watres.2018.06.005 doi GBV00000000000665.pica (DE-627)ELV04369702X (ELSEVIER)S0043-1354(18)30449-4 DE-627 ger DE-627 rakwb eng 333.7 320 VZ Wells, Naomi S. verfasserin aut Anoxic nitrogen cycling in a hydrocarbon and ammonium contaminated aquifer 2018transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. Chemolithotrophic N cycling Elsevier Biodegradation Elsevier Nitrate dual isotopes Elsevier Contaminated groundwater Elsevier Stable isotopes Elsevier Nitrite Elsevier Kappelmeyer, Uwe oth Knöller, Kay oth Enthalten in Elsevier Science Pandey, Avash ELSEVIER Matches, mismatches and priorities of pathways from a climate-resilient development perspective in the mountains of Nepal 2021 a journal of the International Association on Water Quality (IAWQ) Amsterdam [u.a.] (DE-627)ELV006716016 volume:142 year:2018 day:1 month:10 pages:373-382 extent:10 https://doi.org/10.1016/j.watres.2018.06.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 142 2018 1 1001 373-382 10 |
| allfields_unstemmed |
10.1016/j.watres.2018.06.005 doi GBV00000000000665.pica (DE-627)ELV04369702X (ELSEVIER)S0043-1354(18)30449-4 DE-627 ger DE-627 rakwb eng 333.7 320 VZ Wells, Naomi S. verfasserin aut Anoxic nitrogen cycling in a hydrocarbon and ammonium contaminated aquifer 2018transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. Chemolithotrophic N cycling Elsevier Biodegradation Elsevier Nitrate dual isotopes Elsevier Contaminated groundwater Elsevier Stable isotopes Elsevier Nitrite Elsevier Kappelmeyer, Uwe oth Knöller, Kay oth Enthalten in Elsevier Science Pandey, Avash ELSEVIER Matches, mismatches and priorities of pathways from a climate-resilient development perspective in the mountains of Nepal 2021 a journal of the International Association on Water Quality (IAWQ) Amsterdam [u.a.] (DE-627)ELV006716016 volume:142 year:2018 day:1 month:10 pages:373-382 extent:10 https://doi.org/10.1016/j.watres.2018.06.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 142 2018 1 1001 373-382 10 |
| allfieldsGer |
10.1016/j.watres.2018.06.005 doi GBV00000000000665.pica (DE-627)ELV04369702X (ELSEVIER)S0043-1354(18)30449-4 DE-627 ger DE-627 rakwb eng 333.7 320 VZ Wells, Naomi S. verfasserin aut Anoxic nitrogen cycling in a hydrocarbon and ammonium contaminated aquifer 2018transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. Chemolithotrophic N cycling Elsevier Biodegradation Elsevier Nitrate dual isotopes Elsevier Contaminated groundwater Elsevier Stable isotopes Elsevier Nitrite Elsevier Kappelmeyer, Uwe oth Knöller, Kay oth Enthalten in Elsevier Science Pandey, Avash ELSEVIER Matches, mismatches and priorities of pathways from a climate-resilient development perspective in the mountains of Nepal 2021 a journal of the International Association on Water Quality (IAWQ) Amsterdam [u.a.] (DE-627)ELV006716016 volume:142 year:2018 day:1 month:10 pages:373-382 extent:10 https://doi.org/10.1016/j.watres.2018.06.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 142 2018 1 1001 373-382 10 |
| allfieldsSound |
10.1016/j.watres.2018.06.005 doi GBV00000000000665.pica (DE-627)ELV04369702X (ELSEVIER)S0043-1354(18)30449-4 DE-627 ger DE-627 rakwb eng 333.7 320 VZ Wells, Naomi S. verfasserin aut Anoxic nitrogen cycling in a hydrocarbon and ammonium contaminated aquifer 2018transfer abstract 10 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. Chemolithotrophic N cycling Elsevier Biodegradation Elsevier Nitrate dual isotopes Elsevier Contaminated groundwater Elsevier Stable isotopes Elsevier Nitrite Elsevier Kappelmeyer, Uwe oth Knöller, Kay oth Enthalten in Elsevier Science Pandey, Avash ELSEVIER Matches, mismatches and priorities of pathways from a climate-resilient development perspective in the mountains of Nepal 2021 a journal of the International Association on Water Quality (IAWQ) Amsterdam [u.a.] (DE-627)ELV006716016 volume:142 year:2018 day:1 month:10 pages:373-382 extent:10 https://doi.org/10.1016/j.watres.2018.06.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 142 2018 1 1001 373-382 10 |
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Enthalten in Matches, mismatches and priorities of pathways from a climate-resilient development perspective in the mountains of Nepal Amsterdam [u.a.] volume:142 year:2018 day:1 month:10 pages:373-382 extent:10 |
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Enthalten in Matches, mismatches and priorities of pathways from a climate-resilient development perspective in the mountains of Nepal Amsterdam [u.a.] volume:142 year:2018 day:1 month:10 pages:373-382 extent:10 |
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anoxic nitrogen cycling in a hydrocarbon and ammonium contaminated aquifer |
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Anoxic nitrogen cycling in a hydrocarbon and ammonium contaminated aquifer |
| abstract |
Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. |
| abstractGer |
Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. |
| abstract_unstemmed |
Nitrogen fate and transport through contaminated groundwater systems, where N is both ubiquitous and commonly limits pollutant attenuation, must be re-evaluated given evidence for new potential microbial N pathways. We addressed this by measuring the isotopic composition of dissolved inorganic N (DIN = NH4 +, NO2 −, and NO3 −) and N functional gene abundances (amoA, nirK, nirS, hszA) from 20 to 38 wells across an NH4 +, hydrocarbon, and SO4 2− contaminated aquifer. In-situ N attenuation was confirmed on three sampling dates (0, +6, +12 months) by the decreased [DIN] (4300 - 40 μM) and increased δ15N-DIN (5‰–33‰) over the flow path. However, the assumption of negligible N attenuation within the plume was complicated by the presence of alternative electron acceptors (SO4 2−, Fe3+), both oxidizing and reducing functional genes, and N oxides within this anoxic zone. Active plume N cycling was corroborated using an NO2 − dual isotope based model, which found the fastest (∼10 day) NO2 − turnover within the N and electron donor rich central plume. Findings suggest that N cycling is not always O2 limited within chemically complex contaminated aquifers, though this cycling may recycle the N species rather than attenuate N. |
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Anoxic nitrogen cycling in a hydrocarbon and ammonium contaminated aquifer |
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