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The migration and transformation of contaminants controlled by iron-sulfur cycle in the environment is one of the research hotspots in the field of environmental science1-3.However,the effect of sulfide on the coupled geochemistry of arsenic and iron under reduction conditions has not yet been fully understood.In this research,the(im)mobilization of arsenic using sulfide modified ferrihydrite was studied by chemical analysis as well as spectroscopic(FTIR,XPS)and microscopic(HIM)analysis.