Hidden Role of Organic Matter in the Immobilization and Transformation of Iodine on Fe-OM Associations

• DOI: 10.1021/acs.est.4c01135
• Publication Date: 2024-05-22T12:04:13Z
• Authors: Jiangkai Xue; Yamin Deng; Yuxi Zhang; Yao Du; Qing-long Fu; Yuxiao Xu; Jianbo Shi; Yanxin Wang

The biogeochemical processes of iodine are typically coupled with organic matter (OM) and the dynamic transformation iron (Fe) minerals in aquifer systems, which further regulated by association OM Fe minerals. However, roles mobility on Fe-OM associations remain poorly understood. Based batch adsorption experiments subsequent solid-phase characterization, we delved into immobilization iodate iodide different C/Fe ratios under anaerobic conditions. results indicated that a higher ratio (=1) exhibited greater capacity for immobilizing (∼60–80% iodate), was attributed to affinity significantly decreased extent Fe(II)-catalyzed caused associated OM. compounds abundant oxygen high unsaturation were more preferentially ferrihydrite than those poor low unsaturation; thus, capable binding 28.1–45.4% reactive iodine. At comparable ratios, mobilization aromatic susceptible complexes compared coprecipitates. These new findings contribute deeper understanding cycling is controlled environments.