{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,20]],"date-time":"2026-10-20T16:33:27Z","timestamp":1792514007588,"version":"4.5.0"},"reference-count":53,"publisher":"National Academy of Sciences","issue":"4","content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2011,1,25]]},"abstract":"<jats:p>\n                    Mercuric Hg(II) species form complexes with natural dissolved organic matter (DOM) such as humic acid (HA), and this binding is known to affect the chemical and biological transformation and cycling of mercury in aquatic environments. Dissolved elemental mercury, Hg(0), is also widely observed in sediments and water. However, reactions between Hg(0) and DOM have rarely been studied in anoxic environments. Here, under anoxic dark conditions we show strong interactions between reduced HA and Hg(0) through thiolate ligand-induced oxidative complexation with an estimated binding capacity of ~3.5 \u03bcmol Hg\/g HA and a partitioning coefficient &gt;10\n                    <jats:sup>6<\/jats:sup>\n                    mL\/g. We further demonstrate that Hg(II) can be effectively reduced to Hg(0) in the presence of as little as 0.2 mg\/L reduced HA, whereas production of Hg(0) is inhibited by complexation as HA concentration increases. This dual role played by DOM in the reduction and complexation of mercury is likely widespread in anoxic sediments and water and can be expected to significantly influence the mercury species transformations and biological uptake that leads to the formation of toxic methylmercury.\n                  <\/jats:p>","DOI":"10.1073\/pnas.1008747108","type":"journal-article","created":{"date-parts":[[2011,1,10]],"date-time":"2011-01-10T23:55:41Z","timestamp":1294703741000},"page":"1479-1483","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":338,"title":["Mercury reduction and complexation by natural organic matter in anoxic environments"],"prefix":"10.1073","volume":"108","author":[{"given":"Baohua","family":"Gu","sequence":"first","affiliation":[{"name":"Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongrong","family":"Bian","sequence":"additional","affiliation":[{"name":"Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831; and"},{"name":"Institute of Soil Science, Chinese Academy of Science, Nanjing 210008, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carrie L.","family":"Miller","sequence":"additional","affiliation":[{"name":"Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenming","family":"Dong","sequence":"additional","affiliation":[{"name":"Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Jiang","sequence":"additional","affiliation":[{"name":"Institute of Soil Science, Chinese Academy of Science, Nanjing 210008, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liyuan","family":"Liang","sequence":"additional","affiliation":[{"name":"Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831; and"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"341","published-online":{"date-parts":[[2011,1,10]]},"reference":[{"key":"e_1_3_3_1_2","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.ecolsys.29.1.543"},{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.1085941"},{"key":"e_1_3_3_3_2","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.0704186104"},{"key":"e_1_3_3_4_2","first-page":"262","article-title":"Geochemical and biological controls over methylmercury production and degradation in aquatic ecosystems","volume":"835","author":"Benoit JM","year":"2003","unstructured":"JM Benoit, CC Gilmour, A Heyes, RP Mason, CL Miller, Geochemical and biological controls over methylmercury production and degradation in aquatic ecosystems. 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