Roles of Chloride and Sulfate Ions in Controlling Cadmium Transport in a Soil-Rice System as Evidenced by the Cd Isotope Fingerprint

• DOI: 10.1021/acs.est.3c04132
• Publication Date: 2023-09-27T15:04:39Z
• Authors: Songxiong Zhong; Liping Fang; Xiaomin Li; Tongxu Liu; Pei Wang; Ruichuan Gao; Guojun Chen; Haoming Yin; Yang Yang; Fang Huang; Fangbai Li

Anions accompanying inorganic fertilizers, such as chloride and sulfate ions, potentially affect the solubility, uptake, transport of Cd to rice grains. However, role anions in controlling soil-soil solution-Fe plaque-rice plant continuum remains poorly understood. isotope ratios were applied Cd-contaminated soil pots, hydroponic rice, adsorption experiments with or without KCl K2SO4 treatments decipher processes complex soil-rice system. The ions increased concentrations solution, Fe plaque, plants. Accordingly, magnitude positive fractionation from solution was less pronounced, but that between plaque is barely varied. similar composition soil, goethite suggested desorption-sorption iron oxides could be important at continuum. This study reveals roles ions: (i) induce mobility light isotopes (ii) chloro-Cd sulfato-Cd complexes contribute immobilization uptake into roots, (iii) facilitate second leaves/node II-to-grain within shoots. These results provide insights anion-induced effect system facilitating migration transformation.