Fast and accurate quantification of nitrogen and phosphorus constituents in animal slurries using NMR sensor technology

Ole N. Jensen, Michael Beyer, Morten K. Sørensen, Maria Kreimeyer, Niels Chr Nielsen*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

The optimal processing of animal slurry with a minimal environmental impact either as an organic fertilizer or as an energy source for biogas production fundamentally requires accurate, fast, cost-effective, and mobile analytical techniques for the measurement of nitrogen and phosphorus in large volumes of liquid animal slurry. Based on more than 300 different slurries from different species and origins, we provide here an extensive analysis of low-field NMR and standard laboratory measurements for animal slurry analysis. It is found that low-field NMR provides higher precision than wet chemistry laboratory measurements for ammonium nitrogen and total nitrogen, while it provides slightly lower precision for total phosphorus measurements. Low-field NMR may, through a square-root dependency between time and precision, be adapted for analysis at farms, in slurry tankers/transporters, in biogas digesters, or in laboratories.

Original languageEnglish
JournalACS Omega
Volume6
Issue27
Pages (from-to)17335-17341
Number of pages7
ISSN2470-1343
DOIs
Publication statusPublished - Jul 2021

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