{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T07:52:22Z","timestamp":1791186742830,"version":"4.1.0"},"reference-count":34,"publisher":"Wiley","issue":"23","license":[{"start":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:00:00Z","timestamp":1790121600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:00:00Z","timestamp":1790121600000},"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":["42277456"],"award-info":[{"award-number":["42277456"]}],"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":["42221001"],"award-info":[{"award-number":["42221001"]}],"id":[{"id":"10.13039\/501100001809","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>Sunlight exposure can alter plastic\u2010associated material and generate a filterable dissolved organic matter (DOM) pool containing polymer fragments, oxygenated products, and additives. This study compared the molecular composition and time\u2010dependent spectral differences of DOM associated with four widely used plastics.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Particles of poly(lactic acid) (PLA), poly(ethylene terephthalate) (PET), polyethylene (PE), and poly(butylene adipate\u2010co\u2010terephthalate) (PBAT) were dispersed in water and exposed to natural sunlight for 6 or 48\u2009h. After particle removal, DOM was enriched by PPL solid\u2010phase extraction and analyzed by negative\u2010ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. Assigned formulas were compared using elemental classes, intensity\u2010weighted descriptors, van Krevelen distributions, Jaccard similarity, Bray\u2013Curtis dissimilarity, and homologous\u2010series screening.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Between 2247 and 4661 molecular formulas were assigned per sample, with maximum absolute mass errors below 0.60\u2009ppm. Relative to corresponding 6\u2010h spectra, formula numbers were lower at 48\u2009h for PLA (\u221237.5%) and PET (\u221239.3%) but higher for PE (+41.8%) and PBAT (+14.0%). Formula\u2010set similarity was lowest for PET (Jaccard 0.329; Bray\u2013Curtis 0.787) and highest for PBAT (0.712; 0.260). In PLA, a C\n                      <jats:sub>3<\/jats:sub>\n                      H\n                      <jats:sub>4<\/jats:sub>\n                      O\n                      <jats:sub>2<\/jats:sub>\n                      \u2010spaced oxygen\u2010rich series increased from 13.4% to 20.9% of the assigned intensity. A C\n                      <jats:sub>10<\/jats:sub>\n                      H\n                      <jats:sub>8<\/jats:sub>\n                      O\n                      <jats:sub>4<\/jats:sub>\n                      \u2010spaced PET\u2010related series contributed 8.70% at 6\u2009h and 0.17% at 48\u2009h. PET\u201048\u2009h was dominated by CHSO formulas, whereas PE showed greater CHNO abundance and higher relative contribution of lower mass oxygenated CH\n                      <jats:sub>2<\/jats:sub>\n                      series. PBAT retained the greatest formula\u2010set overlap between spectra.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The 6\u2010 and 48\u2010h spectra showed distinct polymer\u2010dependent compositional differences. Homologous\u2010series analysis provided information beyond van Krevelen statistics, whereas nonexclusive N\u2010 and S\u2010containing signals highlighted the need for process blanks, dark controls, and tandem mass spectrometry before source\u2010specific assignments. Because replicate and matched control spectra were not available in the analyzed dataset, these differences are interpreted descriptively and do not demonstrate chemical formation, disappearance, or sunlight\u2010specific transformation.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/rcm.70189","type":"journal-article","created":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T06:06:05Z","timestamp":1790229965000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Formula\u2010Level Turnover and Homologous\u2010Series Patterns in Dissolved Organic Matter Associated With Sunlight\u2010Exposed PLA, PET, PE, and PBAT by Negative\u2010Ion ESI FT\u2010ICR Mass Spectrometry"],"prefix":"10.1002","volume":"40","author":[{"given":"Jun","family":"Dong","sequence":"first","affiliation":[{"name":"801 Institute of Hydrogeology and Engineering Geology Provincial Bureau of Geology and Mineral Resources (SPBGM)  Jinan Shandong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qingzhai","family":"Meng","sequence":"additional","affiliation":[{"name":"801 Institute of Hydrogeology and Engineering Geology Provincial Bureau of Geology and Mineral Resources (SPBGM)  Jinan Shandong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruipeng","family":"Zhang","sequence":"additional","affiliation":[{"name":"801 Institute of Hydrogeology and Engineering Geology Provincial Bureau of Geology and Mineral Resources (SPBGM)  Jinan Shandong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4846-3093","authenticated-orcid":false,"given":"Chao","family":"Ma","sequence":"additional","affiliation":[{"name":"Institute of Surface\u2010Earth System Science, School of Earth System Science Tianjin University  Tianjin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2504-0685","authenticated-orcid":false,"given":"Yulin","family":"Qi","sequence":"additional","affiliation":[{"name":"Institute of Surface\u2010Earth System Science, School of Earth System Science Tianjin University  Tianjin China"},{"name":"Haihe Laboratory of Sustainable Chemical Transformations  Tianjin 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