{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T03:46:19Z","timestamp":1792035979666,"version":"4.4.0"},"reference-count":27,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T00:00:00Z","timestamp":1791936000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T00:00:00Z","timestamp":1791936000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100000270","name":"Natural Environment Research Council","doi-asserted-by":"publisher","award":["NE\/S007431\/1"],"award-info":[{"award-number":["NE\/S007431\/1"]}],"id":[{"id":"10.13039\/501100000270","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000270","name":"Natural Environment Research Council","doi-asserted-by":"publisher","award":["NE\/Z504233\/1"],"award-info":[{"award-number":["NE\/Z504233\/1"]}],"id":[{"id":"10.13039\/501100000270","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000266","name":"Engineering and Physical Sciences Research Council","doi-asserted-by":"publisher","award":["EP\/V034138\/1"],"award-info":[{"award-number":["EP\/V034138\/1"]}],"id":[{"id":"10.13039\/501100000266","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["analyticalsciencejournals.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Rapid Comm Mass Spectrometry"],"published-print":{"date-parts":[[2027,1,15]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Rationale<\/jats:title>\n                    <jats:p>Nitrogen (N) abundance and isotopic compositions in silicate rocks are commonly measured by sealed\u2010tube continuous\u2010flow isotope ratio mass spectrometry (CF\u2010IRMS), but combustion protocols vary widely. It remains uncertain how the quality of data obtained from different published methods compares for differing sample types.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      To address this uncertainty, nitrogen abundance ([N]) and isotopic composition (\u03b4\n                      <jats:sup>15<\/jats:sup>\n                      N) were measured in granite, plagioclase, alkali feldspar and biotite using tube\u2010cracker CF\u2010IRMS with seven different combustion protocols: One followed a combined tube\u2010 and box\u2010furnace method, whereas the other six used a simplified box\u2010furnace\u2010only approach, generally involving longer heating durations at lower temperatures.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>For granite, plagioclase, alkali feldspar and biotite, we successfully identified a method that does not require a 1200\u00b0C heating step in the tube furnace without negatively impacting N yield. For granitic rocks, in cases where the highest yield methods are unsuitable (i.e., due to low [N], high sample mass requirements or lower sample melting point), we propose a suitable alternative that requires corrections on the final measured value to account for incomplete N extraction.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>For sealed tube combustion paired with continuous\u2010flow isotope ratio mass spectrometry, lower combustion temperatures typically reduce N extraction from silicate materials. However, increasing the combustion duration at temperatures equal to or below 1000\u00b0C can reduce, and in some cases eliminate, this yield difference.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/rcm.70193","type":"journal-article","created":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T03:04:14Z","timestamp":1792033454000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Experimental Evaluation and Optimisation of Sealed\u2010Tube Combustion Methods for Silicate Nitrogen Extraction"],"prefix":"10.1002","volume":"41","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-5916-8235","authenticated-orcid":false,"given":"Fawn S. 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