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In this study, Cr\u00ad(III) immobilization by coprecipitation with Fe\u00ad(III) in the presence of straw-derived DOMs under different Fe\/C molar ratios, pHs, and ionic strengths was investigated using scanning transmission X-ray microscopy (STXM) and ptychography and X-ray absorption near-edge structure (XANES) spectroscopy. The results showed that Cr\u00ad(III) retention was enhanced in the presence of DOM, a maximum of which was achieved at an Fe\/C molar ratio of 0.5. The increase of pH and ionic strength could also promote Cr\u00ad(III) immobilization. Cr K-edge XANES results indicated that Fe (oxy)\u00adhydroxide fractions, instead of organics, provided the predominant binding sites for Cr\u00ad(III), which was directly confirmed by high spatial resolution STXM-ptychography analysis at the sub-micron- and nanoscales. Moreover, organics could indirectly facilitate Cr immobilization by improving the aggregation and deposition of coprecipitate particles through DOM bridging or electrostatic interactions. Additionally, C K-edge XANES analysis further indicated that the carboxylic groups of DOM were complexed with Fe (oxy)\u00adhydroxides, which probably contributed to DOM bridging. This study provides a new insight into Cr\u00ad(III) immobilization mechanisms in its coprecipitation with Fe\u00ad(III) and DOM, which could have important implications on the management of Cr\u00ad(III)-enriched soils, particularly with crop straw returning.<\/jats:p>","DOI":"10.1021\/acs.est.1c07528","type":"journal-article","created":{"date-parts":[[2022,2,3]],"date-time":"2022-02-03T02:41:31Z","timestamp":1643856091000},"page":"2432-2442","source":"Crossref","is-referenced-by-count":76,"title":["Molecular\nInsights into Roles of Dissolved Organic\nMatter in Cr(III) Immobilization by Coprecipitation with Fe(III) Probed\nby STXM-Ptychography and XANES Spectroscopy"],"prefix":"10.1021","volume":"56","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2423-8895","authenticated-orcid":true,"given":"Xing","family":"Xia","sequence":"first","affiliation":[{"name":"Chinese Academy of Agricultural Sciences , , ,","place":["Beijing, China, 100081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jian","family":"Wang","sequence":"additional","affiliation":[{"name":"University of Saskatchewan , , , ,","place":["Saskatoon, Saskatchewan, Canada, S7N 2V3"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7510-9444","authenticated-orcid":true,"given":"Yongfeng","family":"Hu","sequence":"additional","affiliation":[{"name":"University of Saskatchewan , , , ,","place":["Saskatoon, Saskatchewan, Canada, S7N 2V3"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jin","family":"Liu","sequence":"additional","affiliation":[{"name":"China Agricultural University , , ,","place":["Beijing, China, 100094"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aminu Inuwa","family":"Darma","sequence":"additional","affiliation":[{"name":"Chinese Academy of Agricultural Sciences , , ,","place":["Beijing, China, 100081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lin","family":"Jin","sequence":"additional","affiliation":[{"name":"Chinese Academy of Agricultural Sciences , , ,","place":["Beijing, China, 100081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Han","sequence":"additional","affiliation":[{"name":"Chinese Academy of Agricultural Sciences , , ,","place":["Beijing, China, 100081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chao","family":"He","sequence":"additional","affiliation":[{"name":"Chinese Academy of Agricultural Sciences , , ,","place":["Beijing, China, 100081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3562-4019","authenticated-orcid":true,"given":"Jianjun","family":"Yang","sequence":"additional","affiliation":[{"name":"Chinese Academy of Agricultural Sciences , , ,","place":["Beijing, China, 100081"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2022,2,3]]},"reference":[{"key":"2026081414103567200_cit1","doi-asserted-by":"publisher","first-page":"1213","DOI":"10.1007\/s10953-004-7137-z","article-title":"Chromium\u00ad(III)\nhydroxide solubility in the aqueous Na+-OH\u2013-H2PO\u20134-HPO2\u20134-PO3\u20134-H2O\nsystem: A thermodynamic model","volume":"33","author":"Rai","year":"2004","journal-title":"J. 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