The role of soil arsenic fractionation in the bioaccessibility, transformation, and fate of arsenic in the presence of human gut microbiota

Soil arsenic (As) fractionation and its bioaccessibility are two important factors in human health risk assessment. However, data related to the impact of As minerals on with gut microbiota involvement scarce. In this study, speciation analysis was determined using HPLC-ICP-MS XANES after incubation colon from origin, combination sequential extraction. Significant increase contributed primarily associated amorphous crystalline Fe/Al (hydr)oxides. We found a high degree transformation at higher (ave. 40 % total As), which predominantly present as liquid-phase As. contrast, occurred mainly solid phase lower (< 5%), especially for soils containing As-S species. spectroscopy revealed that As(III) increased by about 20 soil residues. Finally, excreted may be association (alumino)silicate SEM-EDX. It inferred priority sequence dissolved As(V), As(V) sorbed mineral surfaces, As(V)-bearing sulfides. This study will shed new light role As-bearing evaluating risks exposure.