{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,17]],"date-time":"2026-10-17T06:54:08Z","timestamp":1792220048345,"version":"4.4.0"},"reference-count":97,"publisher":"American Chemical Society (ACS)","issue":"31","license":[{"start":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T00:00:00Z","timestamp":1785196800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/100023638","name":"Scripps Institution of Oceanography","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100023638","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100010870","name":"Stanford Precourt Institute for Energy","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100010870","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000893","name":"Simons Foundation","doi-asserted-by":"publisher","award":["994973"],"award-info":[{"award-number":["994973"]}],"id":[{"id":"10.13039\/100000893","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000001","name":"National Science Foundation (NSF)","doi-asserted-by":"crossref","award":["2406964"],"award-info":[{"award-number":["2406964"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,8,11]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Drainage and deforestation of tropical peatlands release large amounts of dissolved organic matter (DOM) and iron (Fe) in sunlit drainage canals. Rapid sunlight-driven photochemical degradation of this DOM has been shown to reintroduce millennia-old peat carbon into the active carbon cycle through greenhouse gas production. However, the impact of photochemistry on the downstream fate of DOM in drainage canals remains unknown because DOM transformation during tropical peat photodegradation has never been measured. We investigated the potential of Fe to impact the quality of photodegradation products (photoproducts) formed during sunlight exposure of DOM from unshaded tropical peatland canals in Indonesia. After exposure of canal waters to sunlight in controlled experiments, DOM was isolated by solid-phase extraction and analyzed by high-resolution liquid chromatography\u2013tandem mass spectrometry to identify photoproduced formulas and their chemical classes. Over 2400 formulas and 380 molecular structure candidates were found using this approach, including shikimates\/phenylpropanoids and terpenoid-like compounds. We found that canal waters with high dissolved Fe concentrations had the highest chemical diversity of photoproducts, even compared to canal waters exposed to larger doses of light. Our results highlight the importance of Fe and related photo-Fenton reactions in impacting the nature of photoproducts, with potential consequences for downstream DOM lability and mineralization in tropical peatland canals.<\/jats:p>","DOI":"10.1021\/acs.est.6c01013","type":"journal-article","created":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T13:14:53Z","timestamp":1785849293000},"page":"21698-21709","source":"Crossref","is-referenced-by-count":1,"title":["Enhancing\nMolecular Change: Iron-Mediated Photochemistry\nIncreases DOM Transformation in Tropical Peatland Canals"],"prefix":"10.1021","volume":"60","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7438-9587","authenticated-orcid":true,"given":"Lucia","family":"Cancelada","sequence":"first","affiliation":[{"name":"University of California San Diego , , , ,","place":["La Jolla, California, United States, 92093"]},{"name":"University of California San Diego , , , ,","place":["La Jolla, California, United States, 92093"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer C.","family":"Bowen","sequence":"additional","affiliation":[{"name":"University of California San Diego , , , ,","place":["La Jolla, California, United States, 92093"]},{"name":"Stanford University , , , ,","place":["Stanford, California, United States, 94305"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gusti Z.","family":"Anshari","sequence":"additional","affiliation":[{"name":"Universitas Tanjungpura , , ,","place":["Pontianak, Indonesia, 78124"]},{"name":"Universitas Tanjungpura , , ,","place":["Pontianak, Indonesia, 78124"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Irina","family":"Koester","sequence":"additional","affiliation":[{"name":"University of California San Diego , , , ,","place":["La Jolla, California, United States, 92093"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3003-1030","authenticated-orcid":true,"given":"Pieter C.","family":"Dorrestein","sequence":"additional","affiliation":[{"name":"University of California San Diego , , , ,","place":["La Jolla, California, United States, 92093"]},{"name":"University of California San Diego , , , ,","place":["La Jolla, California, United States, 92093"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alison M.","family":"Hoyt","sequence":"additional","affiliation":[{"name":"Stanford University , , , ,","place":["Stanford, California, United States, 94305"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lihini I.","family":"Aluwihare","sequence":"additional","affiliation":[{"name":"University of California San Diego , , , ,","place":["La Jolla, California, United States, 92093"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,7,28]]},"reference":[{"key":"2026081110082046400_cit1","doi-asserted-by":"publisher","first-page":"134","DOI":"10.1016\/j.catena.2017.09.010","article-title":"PEATMAP: Refining Estimates\nof Global Peatland Distribution Based on a Meta-Analysis","volume":"160","author":"Xu","year":"2018","journal-title":"Catena"},{"issue":"34","key":"2026081110082046400_cit2","doi-asserted-by":"publisher","first-page":"20438","DOI":"10.1073\/pnas.1916387117","article-title":"Large Stocks of Peatland\nCarbon and Nitrogen Are Vulnerable to Permafrost\nThaw","volume":"117","author":"Hugelius","year":"2020","journal-title":"Proc. Natl. Acad. Sci. U.S.A."},{"issue":"7639","key":"2026081110082046400_cit3","doi-asserted-by":"publisher","first-page":"86","DOI":"10.1038\/nature21048","article-title":"Age, Extent and Carbon Storage of\nthe Central Congo Basin Peatland Complex","volume":"542","author":"Dargie","year":"2017","journal-title":"Nature"},{"issue":"2","key":"2026081110082046400_cit4","doi-asserted-by":"publisher","first-page":"798","DOI":"10.1111\/j.1365-2486.2010.02279.x","article-title":"Global\nand Regional Importance of\nthe Tropical Peatland Carbon Pool","volume":"17","author":"PAGE","year":"2011","journal-title":"Glob. Chang.\nBiol."},{"key":"2026081110082046400_cit5","unstructured":"Hiraishi, T.; Krug, T.; Tanabe, K.; Srivastava, N.; Jamsranjav, B.; Fukuda, M.; Troxler, T.\n          2013 Supplement\nto the 2006 IPCC Guidelines\nfor National Greenhouse Gas Inventories: 578 Wetlands, 2014."},{"issue":"3","key":"2026081110082046400_cit6","doi-asserted-by":"publisher","first-page":"1053","DOI":"10.5194\/bg-9-1053-2012","article-title":"Subsidence\nand Carbon Loss in Drained\nTropical Peatlands","volume":"9","author":"Hooijer","year":"2012","journal-title":"Biogeosciences"},{"issue":"1\u20133","key":"2026081110082046400_cit7","doi-asserted-by":"publisher","first-page":"183","DOI":"10.1007\/s10533-012-9799-8","article-title":"Impact of Deforestation\non Solid and Dissolved Organic\nMatter Characteristics of Tropical Peat Forests: Implications for\nCarbon Release","volume":"114","author":"Gandois","year":"2013","journal-title":"Biogeochemistry"},{"issue":"7","key":"2026081110082046400_cit8","doi-asserted-by":"publisher","first-page":"1897","DOI":"10.5194\/bg-17-1897-2020","article-title":"From Canals to the\nCoast: Dissolved Organic Matter and Trace Metal Composition in Rivers\nDraining Degraded Tropical Peatlands in Indonesia","volume":"17","author":"Gandois","year":"2020","journal-title":"Biogeosciences"},{"issue":"6","key":"2026081110082046400_cit9","doi-asserted-by":"publisher","first-page":"435","DOI":"10.1038\/s41561-020-0575-4","article-title":"Widespread Subsidence\nand Carbon Emissions across Southeast Asian Peatlands","volume":"13","author":"Hoyt","year":"2020","journal-title":"Nat. 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Technol."},{"key":"2026081110082046400_cit30","doi-asserted-by":"publisher","first-page":"69","DOI":"10.1016\/j.orggeochem.2015.02.007","article-title":"Formation of Black\nCarbon-like and Alicyclic Aliphatic Compounds by Hydroxyl Radical\nInitiated Degradation of Lignin","volume":"82","author":"Waggoner","year":"2015","journal-title":"Org. Geochem."},{"key":"2026081110082046400_cit31","doi-asserted-by":"publisher","first-page":"171","DOI":"10.1016\/j.gca.2017.03.036","article-title":"The Role of Reactive\nOxygen Species in the Degradation of Lignin Derived Dissolved Organic\nMatter","volume":"208","author":"Waggoner","year":"2017","journal-title":"Geochim. Cosmochim. Acta"},{"issue":"6","key":"2026081110082046400_cit32","doi-asserted-by":"publisher","first-page":"1130","DOI":"10.1021\/es020757l","article-title":"Hydroxyl Radical\nProduction via the Photo-Fenton Reaction\nin the Presence of Fulvic Acid","volume":"37","author":"Southworth","year":"2003","journal-title":"Environ. 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Sci."},{"issue":"12","key":"2026081110082046400_cit49","doi-asserted-by":"publisher","DOI":"10.3390\/metabo12121275","article-title":"ConCISE:\nConsensus\nAnnotation Propagation of Ion Features in Untargeted Tandem Mass Spectrometry\nCombining Molecular Networking and In Silico Metabolite Structure\nPrediction","volume":"12","author":"Quinlan","year":"2022","journal-title":"Metabolites"},{"key":"2026081110082046400_cit50","doi-asserted-by":"publisher","DOI":"10.3389\/fmars.2021.630799","article-title":"Molecular Commerce\non Coral Reefs: Using Metabolomics to Reveal Biochemical Exchanges\nUnderlying Holobiont Biology and the Ecology of Coastal Ecosystems","volume":"8","author":"Wegley Kelly","year":"2021","journal-title":"Front. Mar. 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