{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,11]],"date-time":"2026-03-11T01:31:41Z","timestamp":1773192701322,"version":"3.50.1"},"reference-count":31,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2026,2,20]],"date-time":"2026-02-20T00:00:00Z","timestamp":1771545600000},"content-version":"vor","delay-in-days":19,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,2,1]],"date-time":"2026-02-01T00:00:00Z","timestamp":1769904000000},"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":["52039003"],"award-info":[{"award-number":["52039003"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Water Environment Research"],"published-print":{"date-parts":[[2026,2]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    The frequent occurrence of \u201cblack water\u201d in water source reservoirs with\n                    <jats:italic>Eucalyptus<\/jats:italic>\n                    plantations in Guangxi, China, during winter poses a risk to local drinking water safety. Knowledge of the key blackening substances and their molecular compositional characteristics responsible for reservoir water blackening is essential for black water remediation in drinking water reservoirs of\n                    <jats:italic>Eucalyptus<\/jats:italic>\n                    forest areas. This study utilized advanced techniques, including Fourier transform ion cyclotron resonance mass spectrometry (FT\u2010ICR MS), to analyze the molecular composition of soluble organic compounds in both\n                    <jats:italic>Eucalyptus<\/jats:italic>\n                    leaf soaking solutions and water from Jinwo Reservoir and Tianbao Reservoir, which are representative of\n                    <jats:italic>Eucalyptus<\/jats:italic>\n                    forest areas. The findings indicate that the\n                    <jats:italic>Eucalyptus<\/jats:italic>\n                    leaf soaking solution is predominantly composed of aromatic polyphenols, including pyrogallol and gallic acid as parent compounds, along with their polymerized derivatives, among which ellagic acid (C\n                    <jats:sub>14<\/jats:sub>\n                    H\n                    <jats:sub>6<\/jats:sub>\n                    O\n                    <jats:sub>8<\/jats:sub>\n                    ) is the most typical compound. Ellagic acid concentrations are higher in winter reservoir water compared to summer, particularly in surface water versus bottom water. This suggests that the aromatic polyphenols released from fallen\n                    <jats:italic>Eucalyptus<\/jats:italic>\n                    leaves during autumn and winter are the primary substances responsible for the blackening of reservoirs, with ellagic acid being the key blackening substance. Gallic acid reacts with iron ions under neutral conditions to form a black solution without precipitation. The resulting complex intermediate was identified as [C\n                    <jats:sub>14<\/jats:sub>\n                    H\n                    <jats:sub>8<\/jats:sub>\n                    O\n                    <jats:sub>10<\/jats:sub>\n                    Fe]\n                    <jats:sup>\u2212<\/jats:sup>\n                    using FT\u2010ICR MS. This finding further confirms, at the molecular level, that aromatic polyphenols (e.g., ellagic acid and gallic acid) leached from\n                    <jats:italic>Eucalyptus<\/jats:italic>\n                    leaves can bind with iron ions to form black metal\u2010organic complexes, thereby contributing to the blackening of reservoir water. The findings offer crucial insights for effective management and ensuring the safety of drinking water in such reservoirs.\n                  <\/jats:p>","DOI":"10.1002\/wer.70315","type":"journal-article","created":{"date-parts":[[2026,2,20]],"date-time":"2026-02-20T11:17:41Z","timestamp":1771586261000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Investigation of Blackening Substances of \u201cBlack Water\u201d Occurrence in the Reservoirs With\n                    <i>Eucalyptus<\/i>\n                    Plantations, Southern China"],"prefix":"10.1002","volume":"98","author":[{"given":"Yue","family":"Pan","sequence":"first","affiliation":[{"name":"Guangxi Institute of Water Resources Research  Nanning China"},{"name":"Guangxi Key Laboratory of Water Engineering Materials and Structures  Nanning China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peilin","family":"Wu","sequence":"additional","affiliation":[{"name":"Guangxi Institute of Water Resources Research  Nanning China"},{"name":"Guangxi Key Laboratory of Water Engineering Materials and Structures  Nanning China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-1301-2468","authenticated-orcid":false,"given":"Li","family":"Liang","sequence":"additional","affiliation":[{"name":"Guangxi Institute of Water Resources Research  Nanning China"},{"name":"Guangxi Key Laboratory of Water Engineering Materials and Structures  Nanning China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shuai","family":"Zhao","sequence":"additional","affiliation":[{"name":"Guangxi Institute of Water Resources Research  Nanning China"},{"name":"Guangxi Key Laboratory of Water Engineering Materials and Structures  Nanning China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jinchuan","family":"Guo","sequence":"additional","affiliation":[{"name":"Guangxi Institute of Water Resources Research  Nanning China"},{"name":"Guangxi Key Laboratory of Water Engineering Materials and Structures  Nanning China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenlong","family":"Lyu","sequence":"additional","affiliation":[{"name":"Guangxi Institute of Water Resources Research  Nanning China"},{"name":"Guangxi Key Laboratory of Water Engineering Materials and Structures  Nanning China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-2512-471X","authenticated-orcid":false,"given":"Cunwu","family":"Li","sequence":"additional","affiliation":[{"name":"Guangxi Institute of Water Resources Research  Nanning China"},{"name":"Guangxi Key Laboratory of Water Engineering Materials and Structures  Nanning China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shan","family":"Wang","sequence":"additional","affiliation":[{"name":"Henan Water Planning, Design and Research Co., Ltd  Zhengzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ruipeng","family":"Jia","sequence":"additional","affiliation":[{"name":"Yellow River Henan Bureau, YRCC  Zhengzhou 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