{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T15:15:05Z","timestamp":1772118905777,"version":"3.50.1"},"reference-count":36,"publisher":"Wiley","issue":"21","license":[{"start":{"date-parts":[[2022,9,2]],"date-time":"2022-09-02T00:00:00Z","timestamp":1662076800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["analyticalsciencejournals.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Rapid Comm Mass Spectrometry"],"published-print":{"date-parts":[[2022,11,15]]},"abstract":"<jats:sec>\n                    <jats:title>Rationale<\/jats:title>\n                    <jats:p>\n                      The recent development of reliable GC\/qMS methods for \u03b4\n                      <jats:sup>37<\/jats:sup>\n                      Cl compound\u2010specific stable isotope analysis (CSIA) paves the way for dual carbon\u2013chlorine isotope analysis of chlorinated ethenes and thus allows deeper insights into underlying transformation processes\/mechanisms. A two\u2010point calibration is indispensable for the precise and correct conversion of raw data to the international \u03b4\n                      <jats:sup>37<\/jats:sup>\n                      Cl\n                      <jats:sub>SMOC<\/jats:sub>\n                      scale. The currently available calibration standards for tetrachloroethylene (PCE) span only a very narrow range from \u22122.52\u2030 (EIL2) to +0.29\u2030 (EIL1), which is considerably smaller than observed \u03b4\n                      <jats:sup>37<\/jats:sup>\n                      Cl isotope enrichment in (bio\u2010)transformation studies (up to 12\u2030).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      We describe the preparation and evaluation of a new\n                      <jats:sup>37<\/jats:sup>\n                      Cl\u2010enriched PCE standard to avoid bias in \u03b4\n                      <jats:sup>37<\/jats:sup>\n                      Cl CSIA arising from extrapolation beyond the calibration range. The preparation comprised: (i) partial PCE reduction by zero\u2010valent zinc in a system of PCE, ethanol (initial volume ratio 3\/5) and trace amounts of water followed by (ii) liquid\u2013liquid extraction and (iii) a subsequent fractional distillation to purify the\n                      <jats:sup>37<\/jats:sup>\n                      Cl\u2010enriched PCE.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The obtained PCE (PCE\n                      <jats:sub>enriched<\/jats:sub>\n                      ) showed a purity of 98.8% (mole fraction) and a \u03b4\n                      <jats:sup>37<\/jats:sup>\n                      Cl\n                      <jats:sub>SMOC<\/jats:sub>\n                      value of +10.8\u00a0\u00b1\u00a00.5\u2030. The evaluation of an experimental dataset with and without extrapolation showed no significant variation.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>\n                      The new PCE standard (PCE\n                      <jats:sub>enriched<\/jats:sub>\n                      ) expands the calibration range to 13.3\u2030 (previously 2.8\u2030) and thus prevents potential bias introduced by extrapolation beyond the calibration range.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/rcm.9378","type":"journal-article","created":{"date-parts":[[2022,8,17]],"date-time":"2022-08-17T05:54:42Z","timestamp":1660715682000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Expanding the calibration range of compound\u2010specific chlorine isotope analysis by the preparation of a\n                    <sup>37<\/sup>\n                    Cl\u2010enriched tetrachloroethylene"],"prefix":"10.1002","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2007-5504","authenticated-orcid":false,"given":"Daniel","family":"Buchner","sequence":"first","affiliation":[{"name":"Department of Geosciences University of T\u00fcbingen  T\u00fcbingen Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2895-0107","authenticated-orcid":false,"given":"Philipp R.","family":"Martin","sequence":"additional","affiliation":[{"name":"Department of Geosciences University of T\u00fcbingen  T\u00fcbingen Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Johannes","family":"Scheckenbach","sequence":"additional","affiliation":[{"name":"Department of Geosciences University of T\u00fcbingen  T\u00fcbingen Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8114-8116","authenticated-orcid":false,"given":"Steffen","family":"K\u00fcmmel","sequence":"additional","affiliation":[{"name":"Department of Isotope Biogeochemistry Helmholtz Centre for Environmental Research \u2013 UFZ  Leipzig Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2332-4193","authenticated-orcid":false,"given":"Faina","family":"Gelman","sequence":"additional","affiliation":[{"name":"Geological Survey of Israel  Jerusalem Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9309-8523","authenticated-orcid":false,"given":"Stefan B.","family":"Haderlein","sequence":"additional","affiliation":[{"name":"Department of Geosciences University of T\u00fcbingen  T\u00fcbingen 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