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Mercury (Hg) isotope measurements are powerful tools for tracing the sources and biogeochemical cycles of Hg in the environment. In this study, MeHg compound-specific stable isotope analysis (CSIA) was developed in paddy soil and rice plants to trace the biogeochemical cycle of Hg in a paddy ecosystem during the whole rice-growing season. Isotopic fractionation was analyzed separately for MeHg and inorganic Hg (IHg). Results showed distinct isotopic signals between MeHg and IHg in rice plants, indicating different sources. \u03b4202Hg values of MeHg showed no significant differences between roots, stalks, leaves, and grains at each growth stage. The similar \u0394199Hg values of MeHg between rice tissues (0.14 \u00b1 0.08\u2030, 2SD, n = 12), soil (0.13 \u00b1 0.03\u2030, 2SD, n = 4), and irrigation water (0.17 \u00b1 0.09\u2030, 2SD, n = 5) suggested that the soil\u2013water system was the original source of MeHg in rice plants. \u0394199Hg values of IHg in the paddy ecosystem indicated that water, soil, and atmosphere contributed to IHg in grains, leaves, stalks, and roots with varying degree. This study demonstrates that successful application of MeHg CSIA can improve our understanding of the sources and bioaccumulation mechanisms of MeHg and IHg in the paddy ecosystems.<\/jats:p>","DOI":"10.1021\/acs.est.0c03341","type":"journal-article","created":{"date-parts":[[2020,10,28]],"date-time":"2020-10-28T12:23:11Z","timestamp":1603887791000},"page":"14334-14342","source":"Crossref","is-referenced-by-count":66,"title":["Isotopic Fractionation and Source Appointment of Methylmercury and Inorganic Mercury\nin a Paddy Ecosystem"],"prefix":"10.1021","volume":"54","author":[{"given":"Chongyang","family":"Qin","sequence":"first","affiliation":[{"name":"Chinese Academy of Sciences , , ,","place":["Guiyang, China, 550081"]},{"name":"University of Chinese Academy of Sciences , ,","place":["Beijing, China, 100049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Buyun","family":"Du","sequence":"additional","affiliation":[{"name":"Chinese Academy of Sciences , , ,","place":["Guiyang, China, 550081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Runsheng","family":"Yin","sequence":"additional","affiliation":[{"name":"Chinese Academy of Sciences , , ,","place":["Guiyang, China, 550081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7827-8673","authenticated-orcid":true,"given":"Bo","family":"Meng","sequence":"additional","affiliation":[{"name":"Chinese Academy of Sciences , , ,","place":["Guiyang, China, 550081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5174-7150","authenticated-orcid":true,"given":"Xuewu","family":"Fu","sequence":"additional","affiliation":[{"name":"Chinese Academy of Sciences , , ,","place":["Guiyang, China, 550081"]},{"name":"CAS Center for Excellence in Quaternary Science and Global Change , ,","place":["Xi\u2019an, China, 710061"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ping","family":"Li","sequence":"additional","affiliation":[{"name":"Chinese Academy of Sciences , , ,","place":["Guiyang, China, 550081"]},{"name":"CAS Center for Excellence in Quaternary Science and Global Change , ,","place":["Xi\u2019an, China, 710061"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5437-5412","authenticated-orcid":true,"given":"Leiming","family":"Zhang","sequence":"additional","affiliation":[{"name":"Environment and Climate Change Canada , , ,","place":["Toronto, Canada, M3H 5T4"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7462-8998","authenticated-orcid":true,"given":"Xinbin","family":"Feng","sequence":"additional","affiliation":[{"name":"Chinese Academy of Sciences , , ,","place":["Guiyang, China, 550081"]},{"name":"CAS Center for Excellence in Quaternary Science and Global Change , ,","place":["Xi\u2019an, China, 710061"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2020,10,28]]},"reference":[{"key":"2026081717230852700_cit1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1080\/10643389609388485","article-title":"Environmental distribution and transformation\nof mercury compounds","volume":"26","author":"Stein","year":"1996","journal-title":"Crit. 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