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The chemical composition of bio\u2010oils is very complicated as they contain hundreds, if not thousands, of different, mostly oxygen\u2010containing, compounds with a wide distribution of physical properties, chemical structures, and concentrations. Detailed knowledge of bio\u2010oil composition is crucial for optimizing both the pyrolysis processes and for any subsequent upgrading into a more viable fuel resource. Here we report the successful use of low\u2010field, or benchtop, nuclear magnetic resonance (NMR) spectrometers in the analysis of pyrolysis oils. Pyrolysis oils from four different feedstocks were derivatized and analyzed using <jats:sup>19<\/jats:sup>F NMR techniques. The NMR results compare favorably with titrations for total carbonyl content. In addition, the benchtop NMR spectrometer proves able to reveal key spectral features, thus allowing the quantification of different carbonyl groups, such as aldehydes, ketones and quinones. Benchtop NMR spectrometers are typically compact, cheaper than their superconducting counterparts and do not require cryogens. Their use will make NMR analysis of pyrolysis oils easier and more accessible to a wide range of different potential users.<\/jats:p>","DOI":"10.1002\/cssc.202300625","type":"journal-article","created":{"date-parts":[[2023,6,15]],"date-time":"2023-06-15T12:10:20Z","timestamp":1686831020000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Quantitative Low\u2010Field <sup>19<\/sup>F Nuclear Magnetic Resonance Analysis of Carbonyl Groups in Pyrolysis Oils"],"prefix":"10.1002","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6815-547X","authenticated-orcid":false,"given":"Bridget","family":"Tang","sequence":"first","affiliation":[{"name":"Aston Institute of Materials Research Aston University  Aston Triangle Birmingham B4 7ET UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3800-8302","authenticated-orcid":false,"given":"Katie","family":"Chong","sequence":"additional","affiliation":[{"name":"Energy and Bioproducts Research Institute Aston University  Aston Triangle Birmingham B4 7ET UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3536-554X","authenticated-orcid":false,"given":"Arthur J.","family":"Ragauskas","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biomolecular Engineering The University of Tennessee  Knoxville Tennessee 37996 United States"},{"name":"Joint Institute for Biological Sciences Biosciences Division Oak Ridge National Laboratory  Oak Ridge Tennessee 37771 United States"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1471-201X","authenticated-orcid":false,"given":"Robert","family":"Evans","sequence":"additional","affiliation":[{"name":"Aston Institute of Materials Research Aston University  Aston Triangle Birmingham B4 7ET UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,8]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1711842115"},{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/cr900354u"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1039\/9781788010351-00001"},{"key":"e_1_2_9_4_1","volume-title":"Monomers, Polymers and Composites from Renewable Resources","author":"Belgacem M. 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