NPK NMR Sensor: Online Monitoring of Nitrogen, Phosphorus, and Potassium in Animal Slurry

Morten K. Sørensen; Ole Jensen; Oleg N. Bakharev; Tavs Nyord; Niels Christian Nielsen

doi:10.1021/acs.analchem.5b01924

NPK NMR Sensor: Online Monitoring of Nitrogen, Phosphorus, and Potassium in Animal Slurry

Morten K. Sørensen, Ole Jensen, Oleg N. Bakharev, Tavs Nyord, Niels Christian Nielsen

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Letter › peer-review

24 Citations (Scopus)

Abstract

Knowledge of the actual content of nitrogen, phosphorus, and potassium (NPK) in animal slurry is highly important to optimize crop production and avoid environmental pollution When slurry is spread on agricultural fields. Here, we present a mobile, low-field nuclear magnetic resonance (NMR) sensor suitable for online monitoring of the NPK content in animal slurry as an alternative to crude estimates or tedious nonspecific, off-site laboratory analysis: The sensor is based on N-14, O-17, P-31, and K-39 NMR in a digital NMR instrument equipped with a 1.5 T Halbach magnet for direct detection of ammonium N, total P, and K and indirect evaluation of the organic N content, covering all practical components of NPK in animal: slurry. In correlation studies, the obtained NMR measurements show good agreement with reference measurements from commercial laboratories.

Original language	English
Journal	Analytical Chemistry
Volume	87
Issue	13
Pages (from-to)	6446-6450
Number of pages	5
ISSN	0003-2700
DOIs	https://doi.org/10.1021/acs.analchem.5b01924
Publication status	Published - 7 Jul 2015

Keywords

NEAR-INFRARED SPECTROSCOPY
ELECTRICAL-CONDUCTIVITY
N-14
RELAXATION
AMMONIA

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10.1021/acs.analchem.5b01924

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title = "NPK NMR Sensor: Online Monitoring of Nitrogen, Phosphorus, and Potassium in Animal Slurry",

abstract = "Knowledge of the actual content of nitrogen, phosphorus, and potassium (NPK) in animal slurry is highly important to optimize crop production and avoid environmental pollution When slurry is spread on agricultural fields. Here, we present a mobile, low-field nuclear magnetic resonance (NMR) sensor suitable for online monitoring of the NPK content in animal slurry as an alternative to crude estimates or tedious nonspecific, off-site laboratory analysis: The sensor is based on N-14, O-17, P-31, and K-39 NMR in a digital NMR instrument equipped with a 1.5 T Halbach magnet for direct detection of ammonium N, total P, and K and indirect evaluation of the organic N content, covering all practical components of NPK in animal: slurry. In correlation studies, the obtained NMR measurements show good agreement with reference measurements from commercial laboratories.",

keywords = "NEAR-INFRARED SPECTROSCOPY, ELECTRICAL-CONDUCTIVITY, N-14, RELAXATION, AMMONIA",

author = "S{\o}rensen, {Morten K.} and Ole Jensen and Bakharev, {Oleg N.} and Tavs Nyord and Nielsen, {Niels Christian}",

year = "2015",

month = jul,

day = "7",

doi = "10.1021/acs.analchem.5b01924",

language = "English",

volume = "87",

pages = "6446--6450",

journal = "Analytical Chemistry",

issn = "0003-2700",

publisher = "American Chemical Society",

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TY - JOUR

T1 - NPK NMR Sensor

T2 - Online Monitoring of Nitrogen, Phosphorus, and Potassium in Animal Slurry

AU - Sørensen, Morten K.

AU - Jensen, Ole

AU - Bakharev, Oleg N.

AU - Nyord, Tavs

AU - Nielsen, Niels Christian

PY - 2015/7/7

Y1 - 2015/7/7

N2 - Knowledge of the actual content of nitrogen, phosphorus, and potassium (NPK) in animal slurry is highly important to optimize crop production and avoid environmental pollution When slurry is spread on agricultural fields. Here, we present a mobile, low-field nuclear magnetic resonance (NMR) sensor suitable for online monitoring of the NPK content in animal slurry as an alternative to crude estimates or tedious nonspecific, off-site laboratory analysis: The sensor is based on N-14, O-17, P-31, and K-39 NMR in a digital NMR instrument equipped with a 1.5 T Halbach magnet for direct detection of ammonium N, total P, and K and indirect evaluation of the organic N content, covering all practical components of NPK in animal: slurry. In correlation studies, the obtained NMR measurements show good agreement with reference measurements from commercial laboratories.

AB - Knowledge of the actual content of nitrogen, phosphorus, and potassium (NPK) in animal slurry is highly important to optimize crop production and avoid environmental pollution When slurry is spread on agricultural fields. Here, we present a mobile, low-field nuclear magnetic resonance (NMR) sensor suitable for online monitoring of the NPK content in animal slurry as an alternative to crude estimates or tedious nonspecific, off-site laboratory analysis: The sensor is based on N-14, O-17, P-31, and K-39 NMR in a digital NMR instrument equipped with a 1.5 T Halbach magnet for direct detection of ammonium N, total P, and K and indirect evaluation of the organic N content, covering all practical components of NPK in animal: slurry. In correlation studies, the obtained NMR measurements show good agreement with reference measurements from commercial laboratories.

KW - NEAR-INFRARED SPECTROSCOPY

KW - ELECTRICAL-CONDUCTIVITY

KW - N-14

KW - RELAXATION

KW - AMMONIA

U2 - 10.1021/acs.analchem.5b01924

DO - 10.1021/acs.analchem.5b01924

M3 - Letter

C2 - 26020811

SN - 0003-2700

VL - 87

SP - 6446

EP - 6450

JO - Analytical Chemistry

JF - Analytical Chemistry

IS - 13

ER -

NPK NMR Sensor: Online Monitoring of Nitrogen, Phosphorus, and Potassium in Animal Slurry

Abstract

Keywords

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