{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T21:25:36Z","timestamp":1793049936407,"version":"4.5.0"},"reference-count":78,"publisher":"American Chemical Society (ACS)","issue":"4","license":[{"start":{"date-parts":[[2018,11,27]],"date-time":"2018-11-27T00:00:00Z","timestamp":1543276800000},"content-version":"vor","delay-in-days":29,"URL":"https:\/\/pubs.acs.org\/page\/policy\/authorchoice_termsofuse.html"}],"funder":[{"DOI":"10.13039\/100006206","name":"Biological and Environmental Research","doi-asserted-by":"publisher","award":["DE-SC0007042"],"award-info":[{"award-number":["DE-SC0007042"]}],"id":[{"id":"10.13039\/100006206","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2019,2,19]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Mercury (Hg) stable isotope fractionation has been widely used to trace Hg sources and transformations in the environment, although many important fractionation processes remain unknown. Here, we describe Hg isotope fractionation during the abiotic dark oxidation of dissolved elemental Hg(0) in the presence of thiol compounds and natural humic acid. We observe equilibrium mass-dependent fractionation (MDF) with enrichment of heavier isotopes in the oxidized Hg(II) and a small negative mass-independent fractionation (MIF) owing to nuclear volume effects. The measured enrichment factors for MDF and MIF (\u03b5202Hg and E199Hg) ranged from 1.10\u2030 to 1.56\u2030 and from \u22120.16\u2030 to \u22120.18\u2030, respectively, and agreed well with theoretically predicted values for equilibrium fractionation between Hg(0) and thiol-bound Hg(II). We suggest that the observed equilibrium fractionation was likely controlled by isotope exchange between Hg(0) and Hg(II) following the production of the Hg(II)\u2013thiol complex. However, significantly attenuated isotope fractionation was observed during the initial stage of Hg(0) oxidation by humic acid and attributed to the kinetic isotope effect (KIE). This research provides additional experimental constraints on interpreting Hg isotope signatures with important implications for the use of Hg isotope fractionation as a tracer of the Hg biogeochemical cycle.<\/jats:p>","DOI":"10.1021\/acs.est.8b05047","type":"journal-article","created":{"date-parts":[[2018,10,29]],"date-time":"2018-10-29T09:49:20Z","timestamp":1540806560000},"page":"1853-1862","source":"Crossref","is-referenced-by-count":118,"title":["Mercury\nStable Isotope Fractionation during Abiotic\nDark Oxidation in the Presence of Thiols and Natural Organic Matter"],"prefix":"10.1021","volume":"53","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3413-9700","authenticated-orcid":true,"given":"Wang","family":"Zheng","sequence":"first","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37830"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jason D.","family":"Demers","sequence":"additional","affiliation":[{"name":"University of Michigan , , , ,","place":["Ann Arbor, Michigan, United States, 48109"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2150-7575","authenticated-orcid":true,"given":"Xia","family":"Lu","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37830"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1085-4248","authenticated-orcid":true,"given":"Bridget A.","family":"Bergquist","sequence":"additional","affiliation":[{"name":"University of Toronto , , 22 Russell Street , , ,","place":["Toronto, Ontario, Canada, M5S 3B1"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ariel D.","family":"Anbar","sequence":"additional","affiliation":[{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]},{"name":"Arizona State University , , , ,","place":["Tempe, Arizona, United States, 85287"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5389-8633","authenticated-orcid":true,"given":"Joel D.","family":"Blum","sequence":"additional","affiliation":[{"name":"University of Michigan , , , ,","place":["Ann Arbor, Michigan, United States, 48109"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7299-2956","authenticated-orcid":true,"given":"Baohua","family":"Gu","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37830"]},{"name":"University of Tennessee , , , ,","place":["Knoxville, Tennessee, United States, 37996"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2018,10,29]]},"reference":[{"key":"2026090317171370600_cit1","doi-asserted-by":"publisher","first-page":"4967","DOI":"10.1021\/es305071v","article-title":"Mercury as\na global pollutant: sources, pathways, and effects","volume":"47","author":"Driscoll","year":"2013","journal-title":"Environ. 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