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

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 s...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2015-07, Vol.87 (13), p.6446-6450
Main Authors: Sørensen, Morten K, Jensen, Ole, Bakharev, Oleg N, Nyord, Tavs, Nielsen, Niels Chr
Format: Article
Language:English
Subjects:
Analytical chemistry
Animals
Environmental monitoring
Magnetic Resonance Spectroscopy - instrumentation
Nitrogen
Nitrogen - analysis
NMR
Nuclear magnetic resonance
Online
Phosphorus
Phosphorus - analysis
Pollution
Potassium
Potassium - analysis
Sensors
Slurries
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Summary: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 14N, 17O, 31P, and 39K 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.
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.5b01924