Spatial-temporal variations of dissolved organic nitrogen molecular composition in agricultural runoff water

Liguang Li; Zhenli L. He; Malak M. Tfaily; Patrick Inglett; Peter J. Stoffella

doi:10.1016/j.watres.2018.01.035

Spatial-temporal variations of dissolved organic nitrogen molecular composition in agricultural runoff water

Liguang Li, Zhenli L. He, Malak M. Tfaily, Patrick Inglett, Peter J. Stoffella

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

Leaching of dissolved organic nitrogen (DON) has been reported as a pathway of N loss from agriculture, but the molecular composition of DON in agricultural water is poorly understood. Runoff water samples were collected from citrus grove furrows (CGF), ditches (CGD) and pasture ditches (PD) in four seasons. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) was used to investigate molecular composition of DON. Chemodiversity index of DON had spatiotemporal variations, while the molecular composition of total DON showed minimal variations, except for PD in November. Lignin derivatives constituted 61% of the total DON compounds. Relative abundance of aliphatic compounds, char and condensed aromatics of unique DON compounds varied spatiotemporally and had a significant correlation with DON concentration. Aromaticity index decreased from CGF to connected CGD, implying that photodegradation is possibly the dominant process that alters molecular composition of aquatic DON during the transport. Significant differences in unique DON composition between CGD and PD indicates that fertilization and land use affect DON composition. The information on molecular characterization of DON should be useful for tracking DON source and developing technologies to remove DON in the agricultural runoff water.

Original language	English (US)
Pages (from-to)	375-383
Number of pages	9
Journal	Water research
Volume	137
DOIs	https://doi.org/10.1016/j.watres.2018.01.035
State	Published - Jun 15 2018
Externally published	Yes

Keywords

Mass spectrometry
Organic nitrogen molecules
Photodegradation
South Florida
Water quality

ASJC Scopus subject areas

Water Science and Technology
Ecological Modeling
Pollution
Waste Management and Disposal
Environmental Engineering
Civil and Structural Engineering

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10.1016/j.watres.2018.01.035

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@article{5ac536e560794f9ca9f26e066436d28b,

title = "Spatial-temporal variations of dissolved organic nitrogen molecular composition in agricultural runoff water",

abstract = "Leaching of dissolved organic nitrogen (DON) has been reported as a pathway of N loss from agriculture, but the molecular composition of DON in agricultural water is poorly understood. Runoff water samples were collected from citrus grove furrows (CGF), ditches (CGD) and pasture ditches (PD) in four seasons. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) was used to investigate molecular composition of DON. Chemodiversity index of DON had spatiotemporal variations, while the molecular composition of total DON showed minimal variations, except for PD in November. Lignin derivatives constituted 61% of the total DON compounds. Relative abundance of aliphatic compounds, char and condensed aromatics of unique DON compounds varied spatiotemporally and had a significant correlation with DON concentration. Aromaticity index decreased from CGF to connected CGD, implying that photodegradation is possibly the dominant process that alters molecular composition of aquatic DON during the transport. Significant differences in unique DON composition between CGD and PD indicates that fertilization and land use affect DON composition. The information on molecular characterization of DON should be useful for tracking DON source and developing technologies to remove DON in the agricultural runoff water.",

keywords = "Mass spectrometry, Organic nitrogen molecules, Photodegradation, South Florida, Water quality",

author = "Liguang Li and He, {Zhenli L.} and Tfaily, {Malak M.} and Patrick Inglett and Stoffella, {Peter J.}",

note = "Funding Information: This study was supported by a grant (contract# 4600002802) from South Florida Water Management District. Mass spectrometry was performed at the W. R. Wiley Environmental Molecular Sciences Laboratory (EMSL), a USDOE national scientific user facility at the Pacific Northwest National Laboratory (PNNL) under Proposal 49196. We thank Mr. Brian Cain for technical assistance, reviewers and the editor for helpful comments. Funding Information: This study was supported by a grant (contract# 4600002802 ) from South Florida Water Management District . Mass spectrometry was performed at the W. R. Wiley Environmental Molecular Sciences Laboratory (EMSL), a USDOE national scientific user facility at the Pacific Northwest National Laboratory (PNNL) under Proposal 49196. We thank Mr. Brian Cain for technical assistance, reviewers and the editor for helpful comments. Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

month = jun,

day = "15",

doi = "10.1016/j.watres.2018.01.035",

language = "English (US)",

volume = "137",

pages = "375--383",

journal = "Water research",

issn = "0043-1354",

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TY - JOUR

T1 - Spatial-temporal variations of dissolved organic nitrogen molecular composition in agricultural runoff water

AU - Li, Liguang

AU - He, Zhenli L.

AU - Tfaily, Malak M.

AU - Inglett, Patrick

AU - Stoffella, Peter J.

N1 - Funding Information: This study was supported by a grant (contract# 4600002802) from South Florida Water Management District. Mass spectrometry was performed at the W. R. Wiley Environmental Molecular Sciences Laboratory (EMSL), a USDOE national scientific user facility at the Pacific Northwest National Laboratory (PNNL) under Proposal 49196. We thank Mr. Brian Cain for technical assistance, reviewers and the editor for helpful comments. Funding Information: This study was supported by a grant (contract# 4600002802 ) from South Florida Water Management District . Mass spectrometry was performed at the W. R. Wiley Environmental Molecular Sciences Laboratory (EMSL), a USDOE national scientific user facility at the Pacific Northwest National Laboratory (PNNL) under Proposal 49196. We thank Mr. Brian Cain for technical assistance, reviewers and the editor for helpful comments. Publisher Copyright: © 2018 Elsevier Ltd

PY - 2018/6/15

Y1 - 2018/6/15

N2 - Leaching of dissolved organic nitrogen (DON) has been reported as a pathway of N loss from agriculture, but the molecular composition of DON in agricultural water is poorly understood. Runoff water samples were collected from citrus grove furrows (CGF), ditches (CGD) and pasture ditches (PD) in four seasons. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) was used to investigate molecular composition of DON. Chemodiversity index of DON had spatiotemporal variations, while the molecular composition of total DON showed minimal variations, except for PD in November. Lignin derivatives constituted 61% of the total DON compounds. Relative abundance of aliphatic compounds, char and condensed aromatics of unique DON compounds varied spatiotemporally and had a significant correlation with DON concentration. Aromaticity index decreased from CGF to connected CGD, implying that photodegradation is possibly the dominant process that alters molecular composition of aquatic DON during the transport. Significant differences in unique DON composition between CGD and PD indicates that fertilization and land use affect DON composition. The information on molecular characterization of DON should be useful for tracking DON source and developing technologies to remove DON in the agricultural runoff water.

AB - Leaching of dissolved organic nitrogen (DON) has been reported as a pathway of N loss from agriculture, but the molecular composition of DON in agricultural water is poorly understood. Runoff water samples were collected from citrus grove furrows (CGF), ditches (CGD) and pasture ditches (PD) in four seasons. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) was used to investigate molecular composition of DON. Chemodiversity index of DON had spatiotemporal variations, while the molecular composition of total DON showed minimal variations, except for PD in November. Lignin derivatives constituted 61% of the total DON compounds. Relative abundance of aliphatic compounds, char and condensed aromatics of unique DON compounds varied spatiotemporally and had a significant correlation with DON concentration. Aromaticity index decreased from CGF to connected CGD, implying that photodegradation is possibly the dominant process that alters molecular composition of aquatic DON during the transport. Significant differences in unique DON composition between CGD and PD indicates that fertilization and land use affect DON composition. The information on molecular characterization of DON should be useful for tracking DON source and developing technologies to remove DON in the agricultural runoff water.

KW - Mass spectrometry

KW - Organic nitrogen molecules

KW - Photodegradation

KW - South Florida

KW - Water quality

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DO - 10.1016/j.watres.2018.01.035

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AN - SCOPUS:85043999115

SN - 0043-1354

VL - 137

SP - 375

EP - 383

JO - Water research

JF - Water research

ER -

Spatial-temporal variations of dissolved organic nitrogen molecular composition in agricultural runoff water

Abstract

Keywords

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