{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T07:52:21Z","timestamp":1791186741754,"version":"4.1.0"},"reference-count":24,"publisher":"Wiley","issue":"23","license":[{"start":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T00:00:00Z","timestamp":1789689600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T00:00:00Z","timestamp":1789689600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["42522307"],"award-info":[{"award-number":["42522307"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["42372211"],"award-info":[{"award-number":["42372211"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004608","name":"Natural Science Foundation of Jiangsu Province","doi-asserted-by":"publisher","award":["BK20240215"],"award-info":[{"award-number":["BK20240215"]}],"id":[{"id":"10.13039\/501100004608","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100012274","name":"State Key Laboratory of Palaeobiology and Stratigraphy","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100012274","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":[[2026,12,15]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Rationale<\/jats:title>\n                    <jats:p>Stable rubidium (Rb) isotopes have received increasing attention as emerging geochemical tracers for investigating planetary evolution, water\u2013silicate interactions, and global Rb cycling. High\u2010precision Rb isotope measurements by multicollector inductively coupled plasma mass spectrometry (MC\u2010ICP\u2010MS) are commonly performed using the standard\u2010sample bracketing (SSB) method, but this approach is sensitive to short\u2010term instrumental drift.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Building upon the previously reported empirical external normalization (EEN) with\n                      <jats:sup>92<\/jats:sup>\n                      Zr\/\n                      <jats:sup>90<\/jats:sup>\n                      Zr combined with the SSB method, we adopted\n                      <jats:sup>88<\/jats:sup>\n                      Sr\/\n                      <jats:sup>86<\/jats:sup>\n                      Sr for EEN\u2009+\u2009SSB MC\u2010ICP\u2010MS Rb isotope measurement, owing to the closer mass discrimination between Sr and Rb. In this study, we correted the isobaric interference of\n                      <jats:sup>87<\/jats:sup>\n                      Sr on\n                      <jats:sup>87<\/jats:sup>\n                      Rb using an exponential law, compared Sr\u2010EEN with Zr\u2010EEN using the in\u2010house USTC\u2010Rb standard, and evaluated elemental doping effects (K, Ca, Na, and Mn).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The results show that the USTC\u2010Rb standard yielded \u03b4\n                      <jats:sup>87\/85<\/jats:sup>\n                      Rb values of \u22120.15\u2030\u2009\u00b1\u20090.04\u2030 (2SD,\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200933) by Sr\u2010EEN and \u22120.16\u2030\u2009\u00b1\u20090.04\u2030 (2SD,\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200933) by Zr\u2010EEN, indistinguishable within analytical uncertainty. Elemental doping experiments suggest that the measured Rb isotope data were not significantly affected when the K\/Rb, Ca\/Rb, Na\/Rb, and Mn\/Rb ratios were up to 100. The long\u2010term intermediate reproducibility for NIST SRM 984 was 0.00\u2030\u2009\u00b1\u20090.04\u2030 (2SD,\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u2009121).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Because Sr can be effectively separated from Rb using Sr\u2010spec resin, this Sr\u2010EEN method provides a precise and reliable alternative for Rb isotope determination by MC\u2010ICP\u2010MS and exhibits high tolerance to matrix elements.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/rcm.70185","type":"journal-article","created":{"date-parts":[[2026,9,19]],"date-time":"2026-09-19T00:00:12Z","timestamp":1789776012000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["High\u2010Precision Rb Isotope Analysis by MC\u2010ICP\u2010MS Using Sr Empirical External Normalization"],"prefix":"10.1002","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9528-5082","authenticated-orcid":false,"given":"Haoming","family":"Yin","sequence":"first","affiliation":[{"name":"State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-5657-0522","authenticated-orcid":false,"given":"Qi","family":"Feng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9975-152X","authenticated-orcid":false,"given":"Tao","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences  Nanjing China"},{"name":"University of Chinese Academy of Sciences  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,18]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1351\/pac200375060683"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2010.11.004"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/0016\u20107037(95)00038\u20102"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2017.05.033"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.2311402121"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.gca.2023.05.021"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.gca.2022.09.015"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.gca.2024.08.006"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.gca.2021.08.010"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2024.118858"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1039\/d1ja00268f"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1039\/d1ja00315a"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1039\/C7JA00406K"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1029\/2006GC001243"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1039\/b803143f"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1039\/B306953B"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijms.2005.08.003"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1111\/ggr.12484"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.6028\/jres.087.001"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0016\u20107037(03)00389\u20102"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.talanta.2011.10.050"},{"key":"e_1_2_9_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijms.2007.03.020"},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2011.03.009"},{"key":"e_1_2_9_25_1","doi-asserted-by":"publisher","DOI":"10.1007\/s12583\u2010024\u20100145\u20106"}],"container-title":["Rapid 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